CuIn0.7Ga0.3(Se0.6Te0.4)2 (CIGSeTe) thin films have been deposited by e-beam evaporation system. The optical measurements have been carried out in the wavelength range 300–1200 nm. The films have high absorption and optical band gaps ranging from 1.15, 1.12, 1.11, 1.06 and 1.05 eV according to the as deposited and annealing temperatures subsequently as deposited, 450 oC, 475 oC, 500 oC, and 525 oC. The obtained polycrystalline CIGS films showed the chalcopyrite structure with predominant growth in the (1 1 2) direction. The linear dependence of the lattice parameters as a function of Se and Te contents were examined. The lattice parameter were determined as a = 6.00 Å and c = 11.85 Å for as deposited films and a = 6.07 Å and c = 12.09 Å for annealad films at higher temperature 525 oC. The surface map exhibited a compact and a granular morphology depending on the composition with SEM images. Also AFM images verify this better crystallization with bigger grains that roughness varied from 12.10 to 14. 82 nm rms (root mean square) values
Primary Language | English |
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Subjects | Engineering |
Journal Section | Articles |
Authors | |
Publication Date | January 6, 2015 |
Published in Issue | Year 2013 Volume: 9 Issue: 2 |