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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 8
BKCSDE 35(8)
August 20, 2014 

Syntheses of Cu2SnSe3 and Their Transformation into Cu2ZnSnSe4 Nanoparticles with Tunable Band Gap under Multibubble Sonoluminescence Conditions
Jongpil Park, Won Young Lee, Cha Hwan Hwang, Hanggeun Kim, Youngkwon Kim, Il-Wun Shim*
Cu2SnSe3 nanoparticles, Cu2ZnSnSe4 nanoparticles, Sonochemistry, Solar cell materials
Cu2SnSe3 (CTSe) and Cu2ZnSnSe4 (CZTSe) nanoparticles were synthesized by sonochemical reactions under multibubble sonoluminescence (MBSL) conditions. First, Cu2SnSe3 nanoparticles were synthesized by the sonochemical method with an 85% yield, using CuCl, SnCl2, and Se. Second, ZnSe was coated on the CTSe nanoparticles by the same method. Then, they were transformed into CZTSe nanoparticles of 5–7 nm diameters by heating them at 500 °C for 1 h. The ratios between Zn and Sn could be controlled from 1 to 3.75 by adjusting the relative concentrations of CTSe and ZnSe. With relatively lower Zn:Sn ratios (0.75–1.26), there are mostly CZTSe nanoparticles but they are believed to include very small amount of CTS and ZnSe particles. The prepared nanoparticles show different band gaps from 1.36 to 1.47 eV depending on the Zn/Sn ratios. In this sonochemical method without using any toxic or high temperature solvents, the specific stoichiometric element Zn/Sn ratios in CZTSe were controllable on demand and their experimental results were always reproducible in separate syntheses. The CZTSe nanoparticles were investigated by using X-ray diffractometer, a UV-Vis spectrophotometer, scanning electron microscope, Raman spectroscopy, and a high resolution-transmission electron microscope.
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