文章基本信息

标题：A Route to Phase Controllable Cu₂ZnSn(S_1−xSe_x)₄ Nanocrystals with Tunable Energy Bands
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作者：Shulin Ji ; Tongfei Shi ; Xiaodong Qiu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2013
卷号：3
DOI：10.1038/srep02733
出版社：Springer Nature
摘要：Cu₂ZnSn(S_1−xSe_x)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(S_1−xSe_x)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−xSe_x)₄ nanocrystals with bandgap tunable in the range of 1.5–1.12 eV. Consequently, conduction band edge shifted from −3.9 eV to −4.61 eV (relative to vacuum energy) is realized. The phase purity of Cu₂ZnSn(S_1−xSe_x)₄ nanocrystals is substantiated with in-depth combined optical and structural characterizations. Electrocatalytic and thermoelectric performances of Cu₂ZnSn(S_1−xSe_x)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 Cu₂ZnSn(S_1−xSe_x)₄ nanocrystals as solar cell materials, electrocatalysts, and thermoelectric materials.