Effect of tin on bandgap narrowing and optical properties of ZnO–Zn₂SnO₄ electrospun nanofibre composite
2020
Bolarinwa, Hakeem Sanya | Onuu, Michael Ugwu | Animashaun, Lukman Olalekan | Alayande, Samson Oluwagbemiga | Fasasi, Adeniyi Yisau
The quest for improved visible light absorption in ZnO-based photocatalysts and photodetectors is a prevailing research problem. One method of solving this problem is by narrowing the band gap of this material well into the range of visible light energy. In this work, we have demonstrated considerable band narrowing into the visible region in our electrospun ternary ZnO–Zn₂SnO₄ nanofibres. We also showed that band narrowing is highly dependent on the amount of Sn in the synthesized composite which could be attributed to the creation of localized states in the ZnO band and the attendant structural changes. However, beyond 15%wt doping there were observed changes in the trend of the bandgap reduction, crystallite sizes, and width of the localized states in the ternary ZnO–Zn₂SnO₄ band. The details of experimental procedures and discussion of results have been included in this paper.
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