A Route to phase Controllable Cu2ZnSn(S1-xSe x)4 nanocrystals with tunable energy bands

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Abstract

Cu2ZnSn(S1-xSex)4 nanocrystals are an emerging family of functional materials with huge potential of industrial applications, however, it is an extremely challenging task to synthesize Cu2ZnSn(S1-xSex)4 nanocrystals with both tunable energy band and phase purity. Here we show that a green and economic route could be designed for the synthesis of Cu2ZnSn(S 1-xSex)4 nanocrystals with bandgap tunable in the range of 1.5-1.12 eV. Consequently, conduction band edge shifted from -3.9eV to -4.61eV (relative to vacuum energy) is realized. The phase purity of Cu 2ZnSn(S1-xSex)4 nanocrystals is substantiated with in-depth combined optical and structural characterizations. Electrocatalytic and thermoelectric performances of Cu2ZnSn(S 1-xSex)4 nanocrystals verify their superior activity to replace noble metal Pt and materials containing heavy metals. This green and economic route will promote large-scale application of Cu 2ZnSn(S1-xSex)4 nanocrystals as solar cell materials, electrocatalysts, and thermoelectric materials.

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Ji, S., Shi, T., Qiu, X., Zhang, J., Xu, G., Chen, C., … Ye, C. (2013). A Route to phase Controllable Cu2ZnSn(S1-xSe x)4 nanocrystals with tunable energy bands. Scientific Reports, 3. https://doi.org/10.1038/srep02733

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