Abstract
With contemplation of gargantuan light-harvesting capability and cost-effectiveness, the cadmoselite (CdSe) is a vibrant material for photon absorption whose optical response and electrical behaviour could be tailored via Zinc doping. The heat treatment (HT) is indispensable step to modify and align physical characteristics of absorber films for targeted solar cell applications. Present communication unravels properties of thermally evaporated absorber CdSe:Zn 5% films those are heat treated at 423 K, 523 K and 623 K. Structural characteristics unveil formation of polycrystalline films with (111) dominant reflection whose intensity and corresponding crystallite size are enriched from 31 nm to 41 nm with HT. Optical characteristics lay bare enhancement in visible photon absorption and electrical characteristics unveil linear I–V relationship with uplift in conductivity with HT up to 523 K. PL spectra exhibit two bands with highly intense near band edge emission at ∼685 nm whose intensity is enriched with HT. Three dimensional surface topographical micrographs demonstrate spike like grain structures for as-deposited films which modified into hillock grain structures for HT CdSe:Zn films.
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