IV Curve _ PVEducation

4/7/13 IV Curve | PVEducation www.pveducation.org/pvcdrom/solar-cell-operation/iv-curve 1/1 < The photovoltaic effect Short-Circuit Current > Dark Saturation Current, I 0 = 1e-10 A Light Generated Current, I L = 0.5 A Ideality Factor, n = 1 Temperature, T = 300 K Voltage, V = 0.5 V Current, A = 0.4753 A < The photovoltaic effect Short-Circuit Current > IV Curve The IV curve of a solar cell is the superposition of the IV curve of the solar cell diode in the dark with the light- generated current. The light has the effect of shifting the IV curve down into the fourth quadrant where power can be extracted from the diode. Illuminating a cell adds to the normal "dark" currents in the diode so that the diode law becomes: where I L = light generated current. The effect of light on the current-voltage characteristics of a p-junction. The equation for the IV curve in the first quadrant is: The -1 term in the above equation can usually be neglected. The exponential term is usually >> 1 except for voltages below 100 mV. Further, at low voltages the light generated current I L dominates the I 0 (...) term so the -1 term is not needed under illumination. Light Biased IV Curve Calculator Several important parameters which are used to characterise solar cells are discussed in the following pages. The short-circuit current (I SC ), the open-circuit voltage (V OC ), the fill factor (FF) and the efficiency are all parameters determined from the IV curve. Christiana Honsberg and Stuart Bowden Instructions 1. Introduction 2. Properties of Sunlight 3. PN Junction 4. Solar Cell Operation Ideal Solar Cells Solar Cell Structure Light Generated Current Collection Probability Quantum Efficiency Spectral Response The Photovoltaic Effect Solar Cell Parameters IV Curve Short-Circuit Current Open-Circuit Voltage Fill Factor Efficiency Detailed Balance Tandem Cells Resistive Effects Characteristic Resistance Effect of Parasitic Resistances Series Resistance Shunt Resistance Other Effects Impact of Both Series and Shunt Resistance Effect of Temperature Effect of Light Intensity Ideality Factor Chapter 4 Quiz 5. Design of Silicon Cells 6. Manufacturing Si Cells 7. Modules and Arrays 8. Characterization 9. Material Properties Appendicies Korean Version Search Home Courses Instructions Contact Login 1 Lindholm FA, Fossum JG, Burgess EL. Application of the superposition principle to solar-cell analysis. IEEE Transactions on Electron Devices. 1979;26:165–171. 1. [ + ] Feedback

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Transcript of IV Curve _ PVEducation

4713 IV Curve | PVEducation

wwwpveducationorgpvcdromsolar-cell-operationiv-curve 11

lt The photovoltaic effect Short-Circuit Current gt

Dark Saturation Current I0 = 1e-10 A

Light Generated Current IL = 05 A

Ideality Factor n = 1

Temperature T = 300 K

Voltage V = 05 V

Current A = 04753 A

lt The photovoltaic effect Short-Circuit Current gt

IV Curve

The IV curve of a solar cell is the superposition of the IV curve of the solar cell diode in the dark with the light-

generated current The light has the effect of shifting the IV curve down into the fourth quadrant where power

can be extracted from the diode Illuminating a cell adds to the normal dark currents in the diode so that the

diode law becomes

where IL = light generated current

The effect of light on the current-voltage characteristics of a p-junction

The equation for the IV curve in the first quadrant is

The -1 term in the above equation can usually be neglected The exponential term is usually gtgt 1 except for

voltages below 100 mV Further at low voltages the light generated current IL dominates the I0 () term so the -1

term is not needed under illumination

Light Biased IV Curve Calculator

Several important parameters which are used to characterise solar cells are discussed in the following pages The

short-circuit current (ISC) the open-circuit voltage (VOC) the fill factor (FF) and the efficiency are all parameters

determined from the IV curve

Christiana Honsbergand Stuart Bowden

Instructions

1 Introduction

2 Properties of Sunlight

3 PN Junction

4 Solar Cell OperationIdeal Solar CellsSolar Cell StructureLight Generated CurrentCollection ProbabilityQuantum EfficiencySpectral ResponseThe Photovoltaic Effect

Solar Cell ParametersIV CurveShort-Circuit CurrentOpen-Circuit VoltageFill FactorEfficiencyDetailed BalanceTandem Cells

Resistive EffectsCharacteristic ResistanceEffect of Parasitic ResistancesSeries ResistanceShunt Resistance

Other EffectsImpact of Both Series andShunt ResistanceEffect of TemperatureEffect of Light IntensityIdeality FactorChapter 4 Quiz

5 Design of Silicon Cells

6 Manufacturing Si Cells

7 Modules and Arrays

8 Characterization

9 Material Properties

AppendiciesKorean Version

Home Courses Instructions Contact Login

I = minus [exp( )]IL I0qV

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