Ternary thin films of the I-III-VI_2 compound semicon-ductors, suitable for solar energy conversion, have attracted considerable interest. The I-III-VI_2 compounds are the ternary analogues of II-VI compounds [1]. They crystallize in the chalcopyrite structure, which is closely related to zinc blend structure. Ternary chalcopyrite compounds have photovoltaic potential for solar cells since their optical band gap lies between 0.8 and 2.0 eV and they can be grown either as n or p-type[2]. AgInSe_2 is a ternary analogue of CdSe, which has been used for a number of electronic devices. AgInSe_2 is a semiconductor with energy gap of 1.20 eV [1].
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