Phase-controlled synthesis of Cu 2 ZnSnS 4 powders via the microwave-assisted solvothermal route
Journal
Journal of Alloys and Compounds
Journal Volume
632
Pages
354-360
Date Issued
2015
Author(s)
Abstract
Cu 2 ZnSnS 4 was successfully prepared via the microwave-assisted solvothermal route at the reaction temperature as low as 180 ¢XC. In comparison with the conventional solution process for preparing Cu 2 ZnSnS 4 powders, the reaction time was significantly reduced to 1 h, and the preparation procedures were simplified with the incorporation of microwave irradiation technique. The mobility of ions and dipoles are suggested to have been accelerated via the microwave, thereby enhancing the reaction rates. Kesterite and wurtzite Cu 2 ZnSnS 4 powders were formed via adjusting the volume fraction of ethylenediamine in the microwave-solvothermal process. The amount of ethylenediamine affected the morphology of the derived powders due to the selective passivation of ethylenediamine on Cu 2 ZnSnS 4 . The microscopic analysis revealed that the samples prepared with high ethylenediamine concentrations had large particle sizes. The enhanced grain size reduced the surface recombination and increased the photoluminescence intensity of Cu 2 ZnSnS 4 particles. During the microwave-assisted solvothermal process, Cu 2 S was formed first and reacted with the constituent ions and hydrogen sulfide ions to form Cu 2 ZnSnS 4 powders. ? 2015 Published by Elsevier B.V.
Subjects
Cu 2 ZnSnS 4
Microwave
Powders
Solvothermal
Type
journal article