Optical and electrochemical properties of CuInSe2 and CuInS2-CuInSe2 alloys

Neff, H.; Lange, P.; Fearheiley, M. L.; Bachmann, K. J.
November 1985
Applied Physics Letters;11/15/1985, Vol. 47 Issue 10, p1089
Academic Journal
The fundamental optical transitions in single crystals of CuInS2xSe2-2x alloys have been studied by electrolyte electroreflectance (EER) spectroscopy. The band gap of the alloys increases nonlinearly with increasing sulphur content corresponding to a bowing parameter 0.14. The flatband potential derived from the EER spectra is in excellent agreement with differential capacitance measurements and determined as -0.350 V versus the saturated calomel electrode. CuInS2xSe2-2x liquid junction solar cells are reported that exhibit a long wavelength cutoff in the spectral response matching the EER data.


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