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Synthesis and Characterization of Wurtzite-Phase Copper Tin Selenide Nanocrystals
- Norako, Michelle
E., Greaney, Matthew J., Brutchey, Richard L.
- Journal of the American Chemical Society 2012 v.134 no.1 pp. 23-26
- X-ray diffraction, copper, electrochemistry, nanocrystals, selenium, semiconductors, solvents, tin
- A new wurtzite phase of copper tin selenide (CTSe) was discovered, and the resulting nanocrystals were synthesized via a facile solution-phase method. The wurtzite CTSe nanocrystals were synthesized with dodecylamine and 1-dodecanethiol as coordinating solvents and di-tert-butyl diselenide (ᵗBu₂Se₂) as the selenium source. Specific reaction control (i.e., a combination of 1-dodecanethiol with ᵗBu₂Se₂) was proven to be critical in order to obtain this new phase of CTSe, which was verified by powder X-ray diffraction and selected area electron diffraction. The wurtzite CTSe nanocrystals possess an optical and electrochemical band gap of 1.7 eV and display an electrochemical photoresponse indicative of a p-type semiconductor.