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Cu2Ge(S3–xSex) Colloidal Nanocrystals: Synthesis, Characterization, and Composition-Dependent Band Gap Engineering

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journal contribution
posted on 19.02.2016, 10:59 by Chi Yang, Bin Zhou, Shu Miao, Chunyan Yang, Bing Cai, Wen-Hua Zhang, Xin Xu
A facile solution-phase route was developed to synthesize a family of monodisperse Cu2Ge­(S3–xSex) alloyed nanocrystals (NCs) with controlled composition across the entire range (0 ≤ x ≤ 3). The band gaps of the resultant NCs can be engineered by tuning the compositions with a nearly linear relationship between them. The band structures of the NCs were studied by cyclic voltammetry and UV–vis absorption spectroscopy. The conducting behavior was revealed to be p-type for these NCs by photoelectrochemical measurements. Their photovoltaic applicability was finally assessed by fabricating solar cells with the Cu2Ge­(S2Se) NCs as light harvester and CdS nanorods as electron conducting materials.