en.wikipedia.org Wiki Photovoltaics

8/2/2019 en.wikipedia.org Wiki Photovoltaics

1/12

Nellis Solar Power Plant at Nellis Air Force Base in the USA. These panelstrack the sun in one axis.

Photovoltaic SUDI shade is anautonomous and mobile station inFrance that replenishes energy for electric vehicles using solar energy.

Solar panels on the InternationalSpace Station

PhotovoltaicsFrom Wikipedia, the free encyclopedia

Photovoltaics (PV ) is a method of generating electrical power byconverting solar radiation into direct current electricity usingsemiconductors that exhibit the photovoltaic effect. Photovoltaic

power generation employs solar panels composed of a number of solar cells containing a photovoltaic material. Materials presentlyused for photovoltaics include monocrystalline silicon,

polycrystalline silicon, amorphous silicon, cadmium telluride, andcopper indium gallium selenide/sulfide. [1] Due to the growingdemand for renewable energy sources, the manufacturing of solar cells and photovoltaic arrays has advanced considerably in recentyears. [2][3][4]

Solar photovoltaics is growing rapidly, albeit from a small base,to a total global capacity of 67,400 megawatts (MW) at the end of 2011, representing 0.5% of worldwide electricity demand. [5] Thetotal power output of the worlds PV capacity run over a calendar year is equal to some 80 billion kWh of electricity. This issufficient to cover the annual power supply needs of over 20million households in the world. [5] More than 100 countries usesolar PV. [6] Installations may be ground-mounted (and sometimesintegrated with farming and grazing) [7] or built into the roof or walls of a building (building-integrated photovoltaics).

Driven by advances in technology and increases in manufacturingscale and sophistication, the cost of photovoltaics has declinedsteadily since the first solar cells were manufactured [8] and thelevelised cost of electricity (LCOE) from PV is competitive withconventional electricity sources in an expanding list of geographic regions. [9] Net metering and financial incentives, suchas preferential feed-in tariffs for solar-generated electricity, havesupported solar PV installations in many countries. [10]

Contents

1 Solar cells 2 Current developments 3 Economics 4 Applications

4.1 Power stations 4.2 In buildings 4.3 In transport 4.4 Standalone devices 4.5 Rural electrification 4.6 Solar roadways 4.7 Solar Power satellites

5 Advantages 6 Disadvantages 7 See also

Page 1 of 12Photovoltaics - Wikipedia, the free encyclopedia

4/12/2012http://en.wikipedia.org/wiki/Photovoltaics


2/12

Solar cells produce electricity directlyfrom sunlight

Average solar irradiance, watts per square metre. Note that this is for ahorizontal surface, whereas solar

panels are normally mounted at anangle and receive more energy per unit area. The small black dots showthe area of solar panels needed togenerate all of the world's energyusing 8% efficient photovoltaics.

Solar cell productions by region [11]

8 References

Solar cells

Main article: Solar cell

Photovoltaics are best known as a method for generating electric power by using solar cells to convert energy from the sun into aflow of electrons. The photovoltaic effect refers to photons of light exciting electrons into a higher state of energy, allowingthem to act as charge carriers for an electric current. The

photovoltaic effect was first observed by Alexandre-EdmondBecquerel in 1839. [12][13] The term photovoltaic denotes theunbiased operating mode of a photodiode in which currentthrough the device is entirely due to the transduced light energy.Virtually all photovoltaic devices are some type of photodiode.

Solar cells produce direct current electricity from sun light, whichcan be used to power equipment or to recharge a battery. The first

practical application of photovoltaics was to power orbitingsatellites and other spacecraft, but today the majority of

photovoltaic modules are used for grid connected power generation. In this case an inverter is required to convert the DCto AC. There is a smaller market for off-grid power for remotedwellings, boats, recreational vehicles, electric cars, roadsideemergency telephones, remote sensing, and cathodic protection of

pipelines.

Photovoltaic power generation employs solar panels composed of a number of solar cells containing a photovoltaic material.Materials presently used for photovoltaics includemonocrystalline silicon, polycrystalline silicon, amorphoussilicon, cadmium telluride, and copper indium galliumselenide/sulfide. [1] Due to the growing demand for renewableenergy sources, the manufacturing of solar cells and photovoltaicarrays has advanced considerably in recent years. [2][3][4]

Cells require protection from the environment and are usually

packaged tightly behind a glass sheet. When more power isrequired than a single cell can deliver, cells are electricallyconnected together to form photovoltaic modules, or solar panels.A single module is enough to power an emergency telephone, butfor a house or a power plant the modules must be arranged inmultiples as arrays.

A significant market has emerged in off-grid locations for solar- power-charged storage-battery based solutions. These often provide the only electricity available. [14] The first commercialinstallation of this kind was in 1966 on Ogami Island in Japan totransition Ogami Lighthouse from gas torch to fully self-sufficient electrical power.




3/12

Map of solar electricity potential inEurope. Germany is the current leader in the use of photovoltaics, eventhough it has lower insolation levels

than some other parts of Europe.

Due to the growing demand for renewable energy sources, the manufacture of solar cells and photovoltaic arrays has advanced dramatically in recent years. [2][3][4]

Solar photovoltaics is growing rapidly, albeit from a small base, to a total global capacity of 67,400megawatts (MW) at the end of 2011, representing 0.5% of worldwide electricity demand. [5] The total

power output of the worlds PV capacity run over a calendar year is equal to some 80 billion kWh of electricity. This is sufficient to cover the annual power supply needs of over 20 million households in theworld. [5] More than 100 countries use solar PV. [6] World solar PV capacity (grid-connected) was 7.6 GWin 2007, 16 GW in 2008, 23 GW in 2009, and 40 GW in 2010. [15][16][17] More than 100 countries usesolar PV. [6] Installations may be ground-mounted (and sometimes integrated with farming and grazing) [7]

or built into the roof or walls of a building (building-integrated photovoltaics).

Photovoltaic power capacity is measured as maximum power output under standardized test conditions(STC) in "Wp" (Watts peak). [18] The actual power output at a particular point in time may be less than or greater than this standardized, or "rated," value, depending on geographical location, time of day,weather conditions, and other factors. [19] Solar photovoltaic array capacity factors are typically under 25%, which is lower than many other industrial sources of electricity. [20]

The EPIA/Greenpeace Advanced Scenario shows that by the year 2030, PV systems could be generatingapproximately 1.8 TW of electricity around the world. This means that, assuming a serious commitmentis made to energy efficiency, enough solar power would be produced globally in twenty-five years timeto satisfy the electricity needs of almost 14% of the worlds population. [21]

Current developments

Photovoltaic panels based on crystalline silicon modules areencountering competition in the market by panels that employ

thin-film solar cells (CdTe[22]

CIGS,[23]

amorphous Si,[24]

microcrystalline Si), which had been rapidly evolving and areexpected to account for 31 percent of the global installed power

by 2013. [25] However, precipitous drops in prices for polysiliconand their panels in late 2011 have caused some thin-film makersto exit the market and others to experience severely squeezed

profits. [26] Other developments include casting wafers instead of sawing, [27] concentrator modules, 'Sliver' cells, and continuous

printing processes.

The San Jose-based company Sunpower produces cells that have

an energy conversion ratio of 19.5%, well above the marketaverage of 1218%. [28] The most efficient solar cell so far is amulti-junction concentrator solar cell with an efficiency of 43.5%[29] produced by the National Renewable Energy Laboratory in April 2011. The highest efficienciesachieved without concentration include Sharp Corporation at 35.8% using a proprietary triple-junctionmanufacturing technology in 2009, [30] and Boeing Spectrolab (40.7% also using a triple-layer design). AMarch 2010 experimental demonstration of a design by a Caltech group led by Harry Atwater which hasan absorption efficiency of 85% in sunlight and 95% at certain wavelengths is claimed to have near

perfect quantum efficiency. [31] However, absorption efficiency should not be confused with the sunlight-to-electricity conversion efficiency.

For best performance, terrestrial PV systems aim to maximize the time they face the sun. Solar trackersachieve this by moving PV panels to follow the sun. The increase can be by as much as 20% in winter and by as much as 50% in summer. Static mounted systems can be optimized by analysis of the sun path.




4/12

Photovoltaic powerworldwide GWp [5]

2005 5.4

2006 7.0

2007 9.4

2008 15.7

2009 22.9

2010 39.7

2011 67.4Year end capacities

NREL compilation of best research

solar cell efficiencies from 1976 to2010

Panels are often set to latitude tilt, an angle equal to the latitude, but performance can be improved byadjusting the angle for summer or winter. Generally, as with other semiconductor devices, temperaturesabove room temperature reduce the performance of photovoltaics. [32]

A number of solar panels may also be mounted vertically above each other in a tower, if the zenithdistance of the Sun is greater than zero, and the tower can be turned horizontically as a whole and each

panels additionally around a horizontical axis. In such a tower the panels can follow exactly the Sun.Such a device may be described as a ladder mounted on a turnable disk. Each step of that ladder is themiddle axis of a rectangular solar panel. In case the zenith distance of the Sun gets zero, the laddermay be rotated to the north or the south to avoid that a solar panel produces a shadow on a lower mounted solar panel. Instead of an exactly vertical tower one can choose a tower with an axis directed tothe polar star, meaning that it is parallel to the rotation axis of the Earth. In this case the angel betweenthe axis and the Sun is always larger than 66 degrees. During a day it is only necessary to turn the panelsaround this axis to follow the Sun.

The 2011 European Photovoltaic Industry Association (EPIA) report predicted that, "The future of thePV market remains bright in the EU and the rest of the world," the report said. "Uncertain times arecausing governments everywhere to rethink the future of their energy mix, creating new opportunities for

a competitive, safe and reliable electricity source such as PV." [33] 2012 could see the installation of 20 30 GW of PV about the same as in 2011. Unfortunately, the industry's capacity continues to expand,to perhaps as much as 38 GW. The resulting glut of supply has crushed prices and profits. [34] By 2015,131196 GW of photovoltaic systems could be installed around the globe. [33]

Economics

Financial incentives for photovoltaics, such as feed-in tariffs, have often beenoffered to electricity consumers to install and operate solar-electric generatingsystems. Government has sometimes also offered incentives in order to

encourage the PV industry to achieve the economies of scale needed tocompete where the cost of PV-generated electricity is above the cost from theexisting grid. Such policies are implemented to promote national or territorialenergy independence, high tech job creation and reduction of carbon dioxideemissions which cause global warming. Due to economies of scale solar panelsget less costly as people use and buy more as manufacturers increase

production to meet demand, the cost and price is expected to drop in the yearsto come.

According to Shi Zhengrong, in 2012 unsubsidized PV systems already produce electricity in some parts of the world, more cheaply than coal and gas-

fired power plants.[35][36]

As PV system prices decline it is inevitable thatsubsidies will end. "Rapid decline or outright disappearance hasalready been seen in all the major solar markets except China andIndia". [36]

As of 2011, the price of PV modules per MW has fallen by 60 percent since the summer of 2008, according to Bloomberg NewEnergy Finance estimates, putting solar power for the first timeon a competitive footing with the retail price of electricity in anumber of sunny countries. There has been fierce competition inthe supply chain, and further improvements in the levelised costof energy for solar lie ahead, posing a growing threat to thedominance of fossil fuel generation sources in the next few years.




5/12

80 MW Okhotnykovo Solar Park inUkraine.

President Barack Obama speaks atthe DeSoto Next Generation Solar Energy Center.

[37] As time progresses, renewable energy technologies generally get cheaper, [38][39] while fossil fuelsgenerally get more expensive:

The less solar power costs, the more favorably it compares to conventional power, and themore attractive it becomes to utilities and energy users around the globe. Utility-scale solar

power can now be delivered in California at prices well below $100/MWh ($0.10/kWh) lessthan most other peak generators, even those running on low-cost natural gas. Lower solar module costs also stimulate demand from consumer markets where the cost of solar compares very favorably to retail electric rates. [40]

As of 2011, the cost of PV has fallen well below that of nuclear power and is set to fall further. Theaverage retail price of solar cells as monitored by the Solarbuzz group fell from $3.50/watt to $2.43/wattover the course of 2011, and a decline to prices below $2.00/watt seems inevitable: [41]

For large-scale installations, prices below $1.00/watt are common. In some locations, PVhas reached grid parity, the cost at which it is competitive with coal or gas-fired generation.Photovoltaic power is also generated during a time of day that is close to peak demand(precedes it). More generally, it is now evident that, given a carbon price of $50/ton, whichwould raise the price of coal-fired power by 5c/kWh, solar PV will be cost-competitive inmost locations. The declining price of PV has been reflected in rapidly growing installations,totaling about 23 GW in 2011. Although some consolidation is likely in 2012, as firms try torestore profitability, strong growth seems likely to continue for the rest of the decade.Already, by one estimate, total investment in renewables for 2011 exceeded investment incarbon-based electricity generation. [41]

Applications

Power stations

Main articles: Solar parks and solar farms and List of photovoltaic power stations

Many solar photovoltaic power stations have been built, mainlyin Europe. [42] As of December 2011, the largest photovoltaic (PV)

power plants in the world are the Golmud Solar Park (China, 200MW), Sarnia Photovoltaic Power Plant (Canada, 97 MW),Montalto di Castro Photovoltaic Power Station (Italy, 84.2 MW),Finsterwalde Solar Park (Germany, 80.7 MW), OkhotnykovoSolar Park (Ukraine, 80 MW), Lieberose Photovoltaic Park

(Germany, 71.8 MW), Rovigo Photovoltaic Power Plant (Italy,70 MW), Olmedilla Photovoltaic Park (Spain, 60 MW), and theStrasskirchen Solar Park (Germany, 54 MW). [42]

There are also many large plants under construction. The DesertSunlight Solar Farm under construction in Riverside County,California and Topaz Solar Farm being built in San Luis ObispoCounty, California are both 550 MW solar parks that will use thin-film solar photovoltaic modules made by First Solar. [43] TheBlythe Solar Power Project is a 500 MW photovoltaic stationunder construction in Riverside County, California. The Agua

Caliente Solar Project is a 290 megawatt photovoltaic solar generating facility being built in Yuma County, Arizona. TheCalifornia Valley Solar Ranch (CVSR) is a 250 megawatt (MW) solar photovoltaic power plant, which is

being built by SunPower in the Carrizo Plain, northeast of California Valley. [44] The 230 MW Antelope




6/12

Photovoltaic wall at MNACTECTerrassa in Spain

Valley Solar Ranch is a First Solar photovoltaic project which is under construction in the AntelopeValley area of the Western Mojave Desert, and due to be completed in 2013. [45] The Mesquite Solar

project is a photovoltaic solar power plant being built in Arlington, Maricopa County, Arizona, owned bySempra Generation. [46] Phase 1 will have a nameplate capacity of 150 megawatts. [47]

Many of these plants are integrated with agriculture and some use innovative tracking systems thatfollow the sun's daily path across the sky to generate more electricity than conventional fixed-mountedsystems. There are no fuel costs or emissions during operation of the power stations.

In buildings

Main article: List of rooftop photovoltaic installations

Photovoltaic arrays are often associated with buildings: either integrated into them, mounted on them or mounted nearby on theground.

Arrays are most often retrofitted into existing buildings, usuallymounted on top of the existing roof structure or on the existingwalls. Alternatively, an array can be located separately from the

building but connected by cable to supply power for the building.In 2010, more than four-fifths of the 9,000 MW of solar PVoperating in Germany were installed on rooftops. [48] Building-integrated photovoltaics (BIPV) are increasingly incorporatedinto new domestic and industrial buildings as a principal or ancillary source of electrical power. [49] Typically, an array is incorporated into the roof or walls of a

building. Roof tiles with integrated PV cells are also common. A 2011 study using thermal imaging hasshown that solar panels, provided there is an open gap in which air can circulate between them and theroof, provide a passive cooling effect on buildings during the day and also keep accumulated heat in atnight. [50]

The power output of photovoltaic systems for installation in buildings is usually described in kilowatt- peak units (kWp).

In transport

Main article: Photovoltaics in transport

PV has traditionally been used for electric power in space. PV is rarely used to provide motive power intransport applications, but is being used increasingly to provide auxiliary power in boats and cars. A self-contained solar vehicle would have limited power and low utility, but a solar-charged vehicle wouldallow use of solar power for transportation. Solar-powered cars have been demonstrated. [51]

Standalone devices

Until a decade or so ago, PV was used frequently to power calculatorsand novelty devices. Improvements in integrated circuits and low power liquid crystal displays make it possible to power such devices for severalyears between battery changes, making PV use less common. In contrast,solar powered remote fixed devices have seen increasing use recently inlocations where significant connection cost makes grid power

prohibitively expensive. Such applications include water pumps, [52]

parking meters, [53][54] emergency telephones, [55] trash compactors, [56]

temporary traffic signs, and remote guard posts and signals.




7/12

Solar parking paystation.

The 104kW solar highway along theinterchange of Interstate 5 andInterstate 205 near Tualatin, Oregonin December 2008.

Rural electrification

Unlike the past decade, which saw solar solutions purchased mainly byinternational donors, it is now the locals who are increasingly openingtheir wallets to make the switch from their traditional energy means. That

is because solar products prices in recent years have declined to becomecheaper than kerosene and batteries.

In Cambodia, for example, villagers can buy a solar lantern at US$25 anduse it for years without any extra costs, where their previous spending onkerosene for lighting was about $2.5 per month, or $30 per year. InKenya a solar kit that provides bright light or powers a radio or cell

phone costs under $30 at retail stores. By switching to this kit Kenyanscan save $120 per year on kerosene lighting, radio batteries and cell

phone recharging fees. [57]

Developing countries where many villages are often more than fivekilometers away from grid power are increasingly using photovoltaics. Inremote locations in India a rural lighting program has been providingsolar powered LED lighting to replace kerosene lamps. The solar

powered lamps were sold at about the cost of a few months' supply of kerosene. [58][59] Cuba is working to provide solar power for areas that areoff grid. [60] These are areas where the social costs and benefits offer anexcellent case for going solar though the lack of profitability could relegate such endeavors tohumanitarian goals.

Solar roadways

Main article: Solar roadway

In December 2008, the Oregon Department of Transportation placed in service the nations first solar photovoltaic system in aU.S. highway right-of-way. The 104-kilowatt (kW) array

produces enough electricity to offset approximately one-third of the electricity needed to light the Interstate highway interchangewhere it is located. [61]

A 45 mi (72 km) section of roadway in Idaho is being used to testthe possibility of installing solar panels into the road surface, asroads are generally unobstructed to the sun and represent aboutthe percentage of land area needed to replace other energysources with solar power. [62]

Solar Power satellites

Main article: Solar power satellite

Space-based solar power (SBSP) is the concept of collecting solar power in space for use on Earth. It has been in research since the early 1970s. SBSP would differ from current solar collection methods in thatthe means used to collect energy would reside on an orbiting satellite instead of on Earth's surface. Some

projected benefits of such a system are: higher collection rate, longer collection period, and eliminationof weather concerns. SBSP also introduces several new hurdles, primarily the problem of transmittingenergy from orbit to Earth's surface for use.




8/12

Advantages

The 89 PW of sunlight reaching the Earth's surface is plentiful almost 6,000 times more than the15 TW equivalent of average power consumed by humans. [63] Additionally, solar electric generation hasthe highest power density (global mean of 170 W/m) among renewable energies. [63]

Solar power is pollution-free during use. Production end-wastes and emissions are manageable usingexisting pollution controls. End-of-use recycling technologies are under development [64] and policies are

being produced that encourage recycling from producers. [65]

PV installations can operate for many years with little maintenance or intervention after their initial set-up, so after the initial capital cost of building any solar power plant, operating costs are extremely lowcompared to existing power technologies.

Grid-connected solar electricity can be used locally thus reducing transmission/distribution losses(transmission losses in the US were approximately 7.2% in 1995). [66]

Compared to fossil and nuclear energy sources, very little research money has been invested in thedevelopment of solar cells, so there is considerable room for improvement. Nevertheless, experimentalhigh efficiency solar cells already have efficiencies of over 40% in case of concentrating photovoltaiccells [67] and efficiencies are rapidly rising while mass-production costs are rapidly falling. [68]

Disadvantages

In some states of the United States of America, much of the investment in a home-mounted system may be lost if the home-owner moves and the buyer puts less value on the system than the seller. The city of

Berkeley developed an innovative financing method to remove this limitation, by adding a taxassessment that is transferred with the home to pay for the solar panels. [69] Now known as PACE,Property Assessed Clean Energy, 28 U.S. states have duplicated this solution. [70]

See also

Active solar American Solar Energy Society Anomalous photovoltaic effect Carbon nanotubes in photovoltaics Concentrated photovoltaics Cost of electricity by source CZTS Deployment of solar power to energy grids Electromotive_force#Solar_cell History of photovoltaics List of photovoltaics companies List of solar cell manufacturers Maximum power point tracker

Photoelectrochemical cell Photovoltaic power station Photovoltaic and renewable energy

engineering in Australia Photovoltaic cell Quantum efficiency of a solar cell Quantum efficiency Solar cell research Solar energy Solar Module Quality Assurance Solar photovoltaic monitoring Solar thermal energy Theory of solar cell Thermophotovoltaics

References




9/12

1. ^ a b Mark Z. Jacobson (2009). Review of Solutions to Global Warming, Air Pollution, and Energy Security(http://www.stanford.edu/group/efmh/jacobson/EnergyEnvRev1008.pdf) p. 4.

2. ^ a b c German PV market (http://www.solarbuzz.com/FastFactsGermany.htm)3. ^ a b c BP Solar to Expand Its Solar Cell Plants in Spain and India

(http://www.renewableenergyaccess.com/rea/news/story?id=47861)4. ^ a b c Large-Scale, Cheap Solar Electricity (http://www.technologyreview.com/read_article.aspx?

id=17025&ch=biztech)5. ^ a b c d e European Photovoltaic Industry Association (2012). "Market Report

2011" (http://www.epia.org/index.php?id=18) . http://www.epia.org/index.php?id=18.6. ^ a b c REN21 (2011). "Renewables 2011: Global Status

Report" (http://www.ren21.net/Portals/97/documents/GSR/GSR2011_Master18.pdf) . p. 22.http://www.ren21.net/Portals/97/documents/GSR/GSR2011_Master18.pdf.

7. ^ a b GE Invests, Delivers One of World's Largest Solar Power Plants (http://www.huliq.com/18313/ge-invests-delivers-one-of-worlds-largest-solar-power-plants)

8. ^ Richard M. Swanson. Photovoltaics Power Up, Science , Vol. 324, 15 May 2009, p. 891.9. ^ K. Branker, M. J.M. Pathak, J. M. Pearce, A Review of Solar Photovoltaic Levelized Cost of Electricity

(http://dx.doi.org/10.1016/j.rser.2011.07.104) , Renewable & Sustainable Energy Reviews 15, pp.4470-4482(2011). Open access (http://hdl.handle.net/1974/6879)

10. ^ Renewable Energy Policy Network for the 21st century (REN21), Renewables 2010 Global Status Report,Paris, 2010, pp. 180.

11. ^ PV NEWS (Greentech Media) (http://www.greentechmedia.com/research/report/pv-news)12. ^ Photovoltaic Effect (http://www.mrsolar.com/content/photovoltaic_effect.php) . Mrsolar.com. Retrieved on

2010-12-12.13. ^ The photovoltaic effect (http://encyclobeamia.solarbotics.net/articles/photovoltaic.html) .

Encyclobeamia.solarbotics.net. Retrieved on 2010-12-12.14. ^ In Indias Sea of Darkness: An Unsustainable Island of Decentralized Energy Production

(http://consiliencejournal.readux.org/2008/02/in-india%E2%80%99s-sea-of-darkness-an-unsustainable-island-of-decentralized-energy-production/)

15. ^ REN21 (2011). "Renewables 2011: Global StatusReport" (http://www.ren21.net/Portals/97/documents/GSR/GSR2011_Master18.pdf) . p. 15.http://www.ren21.net/Portals/97/documents/GSR/GSR2011_Master18.pdf.

16.^

REN21 (2009). Renewables Global Status Report: 2009 Update(http://www.ren21.net/pdf/RE_GSR_2009_update.pdf) p. 9.17. ^ Eric Martinot and Janet Sawin. Renewables Global Status Report 2009 Update

(http://www.renewableenergyworld.com/rea/news/article/2009/09/renewables-global-status-report-2009-update?cmpid=WNL-Friday-September11-2009) , Renewable Energy World , September 9, 2009.

18. ^ Antonio Luque and Steven Hegedus (2003). Handbook of Photovoltaic Science and Engineering (http://books.google.com/?id=u-bCMhl_JjQC&pg=PT326&dq=wp+%22watts+peak%22+definition) . JohnWiley and Sons. ISBN 0471491969. http://books.google.com/?id=u-bCMhl_JjQC&pg=PT326&dq=wp+%22watts+peak%22+definition.

19. ^ The PVWatts Solar Calculator (http://www.pvwatts.org/)20. ^ UtiliPoint International, Inc. 'Issue alert What is a megawatt?

(http://www.utilipoint.com/issuealert/print.asp?id=1728)21. ^ Solar Generation V 2008 (http://www.greenpeace.org/raw/content/international/press/reports/solar-

generation-v-2008.pdf)22. ^ Company Information Overview (http://www.firstsolar.com/company_overview.php)23. ^ The technology at a glance (http://www.wuerth-solar.de/website/frames.php?

parLANG=EN&parKAT=239)24. ^ Converting sunlight to electricity (http://www.uni-solar.com/interior.asp?id=66)25. ^ "Thin-film's Share of Solar Panel Market to Double by

2013" (http://www.renewableenergyworld.com/rea/news/article/2009/11/thin-films-share-of-solar-panel-market-to-double-by-2013) . Renewable Energy World .http://www.renewableenergyworld.com/rea/news/article/2009/11/thin-films-share-of-solar-panel-market-to-double-by-2013. Retrieved July 7, 2010.

26. ^ Cheyney, Tom (29 July 2011). "Exit strategy: Veecos departure from CIGS thin-film PV equipment spaceraises questions, concerns" (http://www.pv-

tech.org/chip_shots_blog/exit_strategy_veecos_departure_from_cigs_thin_film_pv_equipment_space_raise) . PV-Tech . http://www.pv-tech.org/chip_shots_blog/exit_strategy_veecos_departure_from_cigs_thin_film_pv_equipment_space_raise.Retrieved 10 March 2012.




10/12

27. ^ A Better Way to Make Solar Power (http://www.evergreensolar.com/app/en/technology/)28. ^ "SunPower TM 318 Solar Panel Data

Sheet" (http://www.sunpowercorp.com.au/downloads/product_pdfs/Panels/sp_318Ewh_bf_en_a4_ds_w.pdf) .SunPower. February, 2010.http://www.sunpowercorp.com.au/downloads/product_pdfs/Panels/sp_318Ewh_bf_en_a4_ds_w.pdf.Retrieved 30 March 2011.

29. ^ "Update: Solar Junction Breaking CPV Efficiency Records, Raising

$30M" (http://www.greentechmedia.com/articles/read/solar-junction-setting-new-cpv-efficiency-records/) .Greentech Media. 2011-04-15. http://www.greentechmedia.com/articles/read/solar-junction-setting-new-cpv-efficiency-records/. Retrieved 2011-09-19.

30. ^ Sharp Develops Solar Cell with World's Highest Conversion Efficiency of 35.8%(http://www.physorg.com/news175452895.html)

31. ^ "Caltech Researchers Create Highly Absorbing, Flexible Solar Cells with Silicon WireArrays" (http://media.caltech.edu/press_releases/13325) . California Institute of Technology. February 16,2010. http://media.caltech.edu/press_releases/13325. Retrieved 7 March 2010.

32. ^ Effect of Panel Temperature on a Solar-Pv Ac Water Pumping System(http://www.ars.usda.gov/research/publications/Publications.htm?seq_no_115=182692)

33. ^ a b "Global Market Outlook for Photovoltaics until 2015" (http://www.epia.org/publications/photovoltaic- publications-global-market-outlook/global-market-outlook-for-photovoltaics-until-2015.html) . EuropeanPhotovoltaic Industry Association (EPIA). May 2011. p. 39. http://www.epia.org/publications/photovoltaic-

publications-global-market-outlook/global-market-outlook-for-photovoltaics-until-2015.html.34. ^ Goossens, Ehren (9 March 2012). "Solar Panel Sales Seen Dropping First Time in Decade, Feeding

Glut" (http://www.bloomberg.com/news/2012-03-09/solar-panel-sales-seen-dropping-first-time-in-decade-feeding-glut-energy.html) . Bloomberg. http://www.bloomberg.com/news/2012-03-09/solar-panel-sales-seen-dropping-first-time-in-decade-feeding-glut-energy.html. Retrieved 10 March 2012.

35. ^ Mark Clifford (Feb. 8, 2012). "China's visible solar power success" (http://www.marketwatch.com/Story/story/print?guid=F4031B1C-52B9-11E1-A6A2-002128040CF6) . MarketWatch . http://www.marketwatch.com/Story/story/print?guid=F4031B1C-52B9-11E1-A6A2-002128040CF6.

36. ^ a b Tim Keating (3 February 2012). "Death to PVSubsidies" (http://www.renewableenergyworld.com/rea/news/article/2012/02/death-to-pv-subsidies) .

Renewable Energy World . http://www.renewableenergyworld.com/rea/news/article/2012/02/death-to-pv-

subsidies.37. ^ "Renewables Investment Breaks

Records" (http://www.renewableenergyworld.com/rea/news/article/2011/08/renewables-investment-breaks-records?cmpid=SolarNL-Tuesday-August30-2011) . Renewable Energy World . 29 August 2011.http://www.renewableenergyworld.com/rea/news/article/2011/08/renewables-investment-breaks-records?cmpid=SolarNL-Tuesday-August30-2011.

38. ^ Renewable energy costs drop in '09 (http://www.reuters.com/article/GCA-GreenBusiness/idUSTRE5AM2BE20091123) Reuters , November 23, 2009.

39. ^ Solar Power 50% Cheaper By Year End - Analysis Reuters , November 24, 2009.40. ^ Arno Harris (31 August 2011). "A Silver Lining in Declining Solar

Prices" (http://www.renewableenergyworld.com/rea/news/article/2011/08/a-silver-lining-in-declining-solar- prices) . Renewable Energy World . http://www.renewableenergyworld.com/rea/news/article/2011/08/a-silver-lining-in-declining-solar-prices.

41. ^ a b John Quiggin (January 3, 2012). "The End of the Nuclear Renaissance|" (http://nationalinterest.org/commentary/the-end-the-nuclear-renaissance-6325?page=1) . National Interest .http://nationalinterest.org/commentary/the-end-the-nuclear-renaissance-6325?page=1.

42. ^ a b Denis Lenardic. Large-scale photovoltaic power plants ranking 1 - 50(http://www.pvresources.com/en/top50pv.php) PVresources.com , 2010.

43. ^ "DOE Closes on Four Major Solar Projects" (http://www.renewableenergyworld.com/rea/news/article/2011/09/doe-closes-on-three-major-solar-

projects?cmpid=SolarNL-Tuesday-October4-2011) . Renewable Energy World . 30 September 2011.http://www.renewableenergyworld.com/rea/news/article/2011/09/doe-closes-on-three-major-solar-projects?cmpid=SolarNL-Tuesday-October4-2011.

44. ^ "NRG Energy Completes Acquisition of 250-Megawatt California Valley Solar Ranch fromSunPower" (http://www.marketwatch.com/story/nrg-energy-completes-acquisition-of-250-megawatt-california-valley-solar-ranch-from-sunpower-2011-09-30) . MarketWatch . 30 September 2011.http://www.marketwatch.com/story/nrg-energy-completes-acquisition-of-250-megawatt-california-valley-solar-ranch-from-sunpower-2011-09-30.




11/12

45. ^ "Exelon purchases 230 MW Antelope Valley Solar Ranch One from FirstSolar" (http://www.solarserver.com/solar-magazine/solar-news/current/2011/kw40/exelon-purchases-230-mw-antelope-valley-solar-ranch-one-from-first-solar.html) . Solar Server . 4 October 2011.http://www.solarserver.com/solar-magazine/solar-news/current/2011/kw40/exelon-purchases-230-mw-antelope-valley-solar-ranch-one-from-first-solar.html.

46. ^ "Sempra Generation contracts with PG&E for 150 mw of solar power" (http://public.sempra.com/newsreleases/viewpr.cfm?PR_ID=2536&Co_Short_Nm=SE) . Sempra

Energy. October 12, 2010. http://public.sempra.com/newsreleases/viewpr.cfm?PR_ID=2536&Co_Short_Nm=SE. Retrieved 2011-02-06.47. ^ "Mesquite Solar" (http://www.semprageneration.com/mesquite_solar.htm) . Sempra Generation.

http://www.semprageneration.com/mesquite_solar.htm. Retrieved 2011-02-06.48. ^ Germany To Raise Solar Target for 2010 & Adjust Tariffs | Renewable Energy News Article

(http://www.renewableenergyworld.com/rea/news/article/2010/06/germany-to-raise-solar-target-for-2010-adjust-tariffs?cmpid=WNL-Friday-June4-2010) . Renewableenergyworld.com. Retrieved on 2010-12-12.

49. ^ Building Integrated Photovoltaics (http://www.buildingsolar.com/technology.asp) , Wisconsin PublicService Corporation, accessed: 2007-03-23.

50. ^ "Solar panels keep buildings cool" (http://www.jacobsschool.ucsd.edu/news/news_releases/release.sfe?id=1094) . University of California, San Diego.http://www.jacobsschool.ucsd.edu/news/news_releases/release.sfe?id=1094. Retrieved 19 July 2011.

51. ^ SolidWorks Plays Key Role in Cambridge Eco Race Effort(http://www.businessweekly.co.uk/2009020332936/innova-systems/solidworks-plays-key-role-in-cambridge-eco-race-effort.html) . Retrieved 8 February 2009.

52. ^ "Solar water pumping" (http://www.builditsolar.com/Projects/WaterPumping/waterpumping.htm) .builditsolar.com . http://www.builditsolar.com/Projects/WaterPumping/waterpumping.htm. Retrieved June 16,2010.

53. ^ Solar-Powered Parking Meters Installed (http://www.10news.com/news/18743920/detail.html)54. ^ "Solar-powered parking meters make downtown debut" (http://impactnews.com/southwest-austin/recent-

news/5158-solar-powered-parking-meters-make-downtown-debut) . Impactnews.com. 2009-07-22.http://impactnews.com/southwest-austin/recent-news/5158-solar-powered-parking-meters-make-downtown-debut. Retrieved 2011-09-19.

55. ^ Security Products, December 2006, p4256. ^ Philadelphia's Solar-Powered Trash Compactors (http://www.msnbc.msn.com/id/32110044)

57.^

Delivering Solar to a Distribution-cursed Market (by Yotam Ariel)(http://www.renewableenergyworld.com/rea/news/article/2011/08/delivering-solar-to-rural-markets-distribution-challenges-in-the-developing-world)

58. ^ Solar loans light up rural India (http://news.bbc.co.uk/2/hi/science/nature/6600213.stm)59. ^ Off grid solutions for remote poor (http://www.ebono.org/index.php?

option=com_content&task=view&id=2036&Itemid=2)60. ^ Rural Cuba Basks in the Sun (http://www.islamonline.net/English/Science/2003/07/article16.shtml)61. ^ "The ODOT Solar Highway" (http://www.oregon.gov/ODOT/HWY/OIPP/inn_solarhighway.shtml) .

Oregon Dept. of Transportation. http://www.oregon.gov/ODOT/HWY/OIPP/inn_solarhighway.shtml.Retrieved 22 April 2011.

62. ^ Solar Roads attract funding (http://www.ebono.org/index.php?option=com_content&task=view&id=2065&Itemid=2)

63. ^ a b Vaclav Smil Energy at the Crossroads (http://www.oecd.org/dataoecd/52/25/36760950.pdf#search=%22worldwide%20consumption%20of%20energy%2013%20TW%20smil%22)

64. ^ Environmental Aspects of PV Power Systems (http://nws.chem.uu.nl/publica/97072.pdf)65. ^ N. C. McDonald and J. M. Pearce, Producer Responsibility and Recycling Solar Photovoltaic Modules

(http://dx.doi.org/10.1016/j.enpol.2010.07.023) , Energy Policy 38 , pp. 70417047(2010).66. ^ U.S. Climate Change Technology Program Transmission and Distribution Technologies

(http://www.climatetechnology.gov/library/2003/tech-options/tech-options-1-3-2.pdf)67. ^ World Record: 41.1% efficiency reached for multi-junction solar cells (http://www.ise.fraunhofer.de/press-

and-media/press-releases/press-releases-2009/world-record-41.1-efficiency-reached-for-multi-junction-solar-cells-at-fraunhofer-ise) Fraunhofer ISE

68. ^ solarcellsinfo.com (http://solarcellsinfo.com/blog/archives/1018)69. ^ "Berkeley FIRST Solar Financing City of Berkeley,

CA" (http://www.cityofberkeley.info/ContentDisplay.aspx?id=26580) . cityofberkeley.info .

http://www.cityofberkeley.info/ContentDisplay.aspx?id=26580. Retrieved September 7, 2010.)70. ^ DSIRE Solar (http://dsireusa.org/solar/solarpolicyguide/?id=26)

Retrieved from "http://en.wikipedia.org/w/index.php?title=Photovoltaics&oldid=486787056"




12/12

Categories: Photovoltaics

This page was last modified on 11 April 2012 at 09:34. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms

may apply. See Terms of use for details.Wikipedia is a registered trademark of the Wikimedia Foundation, Inc., a non-profitorganization.


en.wikipedia.org Wiki Photovoltaics

Documents

Transcript of en.wikipedia.org Wiki Photovoltaics