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Cu2Ge(S3–xSex) Colloidal Nanocrystals: Synthesis, Characterization, and Composition-Dependent Band Gap Engineering
- Yang, Chi, Zhou, Bin, Miao, Shu, Yang, Chunyan, Cai, Bing, Zhang, Wen-Hua, Xu, Xin
- Journal of the American Chemical Society 2013 v.135 no.16 pp. 5958-5961
- engineering, nanocrystals, nanorods, photovoltaic cells, ultraviolet-visible spectroscopy
- 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.