title: Phosphate-free synthesis, optical absorption and photoelectric properties of Cu2ZnGeS4 and Cu2ZnGeSe4 uniform nanocrystals.
abstract: Copper-based quaternary chalcogenide semiconductor Cu2ZnGeS4 and Cu2ZnGeSe4 nanocrystals have been synthesized successfully via a simple and convenient one-pot phosphine-free solution approach. Oleylamine was used as both the solvent and reductant for Se or S and benefited the formation of homogeneous quaternary nanocrystals. Scanning transmission electron microscopy-EDS elemental mapping confirms the uniform spatial distribution of four elements in nanocrystals. UV-Vis absorption spectra of Cu2ZnGeS4 and Cu2ZnGeSe4 nanocrystals show strong photon absorption in the entire visible range. The photoresponsive behavior indicates the potential application of Cu2ZnGeSe4 nanocrystals in solar energy conversion systems.
authors.affiliation: Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China. sliang@ustc.edu.cn
authors.forename: Liang
authors.initials: L
authors.lastname: Shi
authors.forename: Peiqun
authors.initials: P
authors.lastname: Yin
mesh_terms: D003300:Copper / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D010316:Particle Size; D055668:Photochemical Processes; D012643:Selenium / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry*
chemical_list: D005857:Germanium; D013455:Sulfur; D003300:Copper; D012643:Selenium; D015032:Zinc