Zinc antimony sulphide thin films have been deposited on plane glass substrate using Chemical Bath Deposition technique. This is a two-step co-deposition technique of ZnS and Sb2S3 on same glass substrate; which resulted in ZnS-Sb2S3 composite film being fabricated by first growing ZnS and Sb2S3 binary components on separate glass substrates and then growing one on top of the other. Thereafter interfacial diffusion of atoms took place in the bilayer stack that resulted in ternary zinc antimony sulphide, Zn1-xSbxS (0 < x < 1) of variable stoichiometry across the junction. This interfacial diffusion was enhanced through 200 annealing of fabricated films. The resulting films showed band gap that varied from 2.50 eV to 3.10 eV, optical transmittance of up to 66 and structural properties that rendered them applicable as anti reflection coating and light trappers for solar devices.
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