ABSTRACT

The quaternary Alloys CuInSe2(1−x)S2x crystals were grown by chemical transport for x= 0.0, 0.01, 0.40,0.50, 0.70,0.80, 0.90, 1.0. From X-ray data it is found that the lattice parameters a and c vary linearly with the composition x as;a(Å) = 5.7946 −x, c(Å) = c(Å) = 11.5685 Å 0.0473x. The preference ordering of the Se atoms around the In atoms, the S atoms around the Cu atoms in accordance with the hard-soft acid/base theory and the u parameter were found by crystal structure analysis.

Optical absorption measurement were done and the linear variation of the energy gap with composition was determined: Eg = 0.905+ 0.435x (eV). The defects in these crystals were analysed by Scanning Electron Microscopy and EDX analysis for determining the real composition of these alloys, and possible clusters and defects on the crystal surface.