Progress and Paper report

Progress and Paper Progress and Paper reportreport

Sept 23, 2009Sept 23, 2009

ProgressProgress

SPP Manuscript was acceptedSPP Manuscript was accepted

Evaporation of a multilayer coating Evaporation of a multilayer coating with low transmission in the with low transmission in the Infrared region Infrared region

A. K. Ang1, P.V. Ramos, M. L. Jamero and I. B. CulabaA. K. Ang1, P.V. Ramos, M. L. Jamero and I. B. Culaba

IntroductionIntroduction

1970’s energy crisis led to research 1970’s energy crisis led to research focused on conserving energyfocused on conserving energy• German researchers found windows as German researchers found windows as

one of the biggest “heat holes”one of the biggest “heat holes”• Heat insulating coatings on windowsHeat insulating coatings on windows


BiOx/Au/BiOx, ZnS/Au/ZnS, BiOx/Au/BiOx, ZnS/Au/ZnS, glass/BiOx/PbOx/Ag/PbOx/BiOx, glass/BiOx/PbOx/Ag/PbOx/BiOx, TiO2/Ag/ZnO and TiO2/Ag/TiO2 TiO2/Ag/ZnO and TiO2/Ag/TiO2 systemssystems

Silver based systemsSilver based systems• Lowest thermal transmissionLowest thermal transmission• Highest visible light transmissionHighest visible light transmission


Similar optical properties of Ag, Au, Similar optical properties of Ag, Au, Al, CuAl, Cu

DesignDesign

Cr/Cu/Cr on glass substratesCr/Cu/Cr on glass substrates• Cr adhesion layerCr adhesion layer• Cu layer as the main mirrorCu layer as the main mirror• Third Cr layer for suppression of surface Third Cr layer for suppression of surface

oxidation, preserving its optical oxidation, preserving its optical propertiesproperties

MethodologyMethodology

36.5mmx 25.5mmx 1.1mm glass slides36.5mmx 25.5mmx 1.1mm glass slides Cleaning procedure for glassCleaning procedure for glass

• NN22 gas gas• KOH solutionKOH solution

• KOH + CaCOKOH + CaCO33

• HNOHNO33

• Distilled waterDistilled water• 2-propanol2-propanol• Breathe testBreathe test

MethodologyMethodologyThickness monitorSlides

Substrate holder


Base pressure of 10Base pressure of 10-5-5 torr torr Chromium layersChromium layers

• Cr-coated tungsten rod at 90ACr-coated tungsten rod at 90A Copper layersCopper layers

• Mb dimpled boat at 180AMb dimpled boat at 180A


Ocean Optics USB-2000 Ocean Optics USB-2000 SpectrophotometerSpectrophotometer• 400nm-800nm400nm-800nm

Shimadzu IRAffinity 1 FT-IR Shimadzu IRAffinity 1 FT-IR SpectrophotometerSpectrophotometer• 2000nm-20000nm2000nm-20000nm

800nm-2000nm800nm-2000nm• No dataNo data

Results and discussionsResults and discussions

LayerLayer Sample 1Sample 1 Sample 2Sample 2 Sample 3Sample 3 Sample 4Sample 4

CrCr 7.2 nm7.2 nm 6.1 nm6.1 nm 6.8 nm6.8 nm 6.8 nm6.8 nm

CuCu 199 nm199 nm 144.7 nm144.7 nm 98 nm98 nm 50.5 nm50.5 nm

CrCr 8 nm8 nm 5.6 nm5.6 nm 7.1 nm7.1 nm 6.3 nm6.3 nm

Glass substrateGlass substrate


B

A

D

C

8μm

8μm

8μm

8μm

Results and discussionResults and discussionss


in a study conducted by Hass, the in a study conducted by Hass, the percent reflectance of copper films in percent reflectance of copper films in the 800-2000nm region is constant the 800-2000nm region is constant at around 90% [9]. With such high at around 90% [9]. With such high reflectance in this region, the reflectance in this region, the percent transmission is expected to percent transmission is expected to be minimal, which agrees with the be minimal, which agrees with the data in Fig. 2.data in Fig. 2.

ConclusionConclusion

““Thus Cr/Cu/Cr coatings, having Thus Cr/Cu/Cr coatings, having minimal infrared transmission and minimal infrared transmission and transmission peaks in the visible transmission peaks in the visible region, can be used as a heat region, can be used as a heat insulating system coated on insulating system coated on windows” windows”

Transmission of Cr/Cu/Cr thin film in the visible region

0

20

40

60

400 450 500 550 600 650 700 750 800

Wavelength (nm)

Tra

nsm

issi

on

(%

)

Sample 4

Sample 3

Sample 2

Sample 1

Progress

• Collected new data in visible region

ProgressProgress

Also collected data in the visible Also collected data in the visible region using Shimadzu UV PC region using Shimadzu UV PC SpectrophotometerSpectrophotometer• Double beam spectrophotometerDouble beam spectrophotometer• Data still not retrieved from Chem Data still not retrieved from Chem

department PCdepartment PC

ProgressProgress

Performed Performed adhesion test for adhesion test for first 4 samplesfirst 4 samples

ProgressProgress

Trial 1 Trial 1

(N)(N)Trial 2 Trial 2

(N)(N)Trial 3 Trial 3

(N)(N) Average(N)Average(N)

200 nm Cu200 nm Cu CrCuCr 1CrCuCr 1 6.86.8 1111 8.68.6 8.88.8

150 nm Cu150 nm Cu CrCuCr 2CrCuCr 2 15.415.4 13.713.7 23.223.2 17.4333317.43333

100 nm Cu100 nm Cu CrCUCr 3CrCUCr 3 6.96.9 5.75.7 8.38.3 6.9666676.966667

50 nm Cu50 nm Cu CrCuCr 4CrCuCr 4 99 12.812.8 16.116.1 12.6333312.63333

202.4 nm Cu202.4 nm Cu Test CuTest Cu 19.819.8 11.911.9 10.110.1 13.9333313.93333

100 nm Cu100 nm Cu Test CuTest Cu 15.615.6 12.912.9 9.79.7 12.7333312.73333

50 nm Cu 50 nm Cu Test CuTest Cu 22.522.5 20.420.4 15.615.6 19.519.5

ProgressProgress

Fabricated new samplesFabricated new samples• Deposition time as basis of film Deposition time as basis of film

thicknessthickness 20 sec of Cr deposition at 90 A20 sec of Cr deposition at 90 A

4 nm/sec x 20 sec = 8 nm4 nm/sec x 20 sec = 8 nm Cu deposition at 180 ACu deposition at 180 A

• 20, 30, 60, 180 sec samples were already 20, 30, 60, 180 sec samples were already fabricatedfabricated

ProgressProgress

Set up for heat insulating testsSet up for heat insulating tests

150W lamp

IR thermometer

Mask Heat shield Heat absorbing plate

Things to doThings to do

Test heat shield propertiesTest heat shield properties Purity test for Cu used in evaporationPurity test for Cu used in evaporation Acquire coated window samples from Acquire coated window samples from

UPPAUPPA Compare heat shielding properties of Compare heat shielding properties of

these with Cr/Cu/Cr samplesthese with Cr/Cu/Cr samples

Progress and Paper report

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