Effect of Copper Concentration on the Optical Properties of Cu₂Zn_0.8Cd_0.2SnS₄ Pentrary Alloy Nanostructures

摘要： Cu2Zn0.2Cd0.8SnS4 pentrary alloy nanostructures deposited at different molarity copper 0.3, 0.5, 0.7 and 0.9 M were grown by sol-gel method on glass substrate. The optical absorption indicates that the band gap of Cu2Zn0.2Cd0.8SnS4 nanostructures decreases linearly from 1.80 eV (0.3M) to 1.60 eV (0.9M). The transmittance value is in the range 63-49% depending on the Cu content.