Jin Chunyu, Ramasamy Parthiban, Kim Jinkwon
Department of Chemistry and GETRC, Kongju National University, 182, Shinkwondong, Kongju, 314-701, Chungnam-do, Republic of Korea.
Dalton Trans. 2014 Jul 7;43(25):9481-5. doi: 10.1039/c4dt00688g.
Cu2ZnSnSe4 is a prospective material as an absorber in thin film solar cells due to its many advantages including direct band gap, high absorption coefficient, low toxicity, and relative abundance (indium-free) of its elements. In this report, CZTSe nanoparticles have been synthesized by the hot-injection method using bis-(triethylsilyl)selenide [(Et3Si)2Se] as the selenium source for the first time. Energy dispersive X-ray spectroscopy (EDS) confirmed the stoichiometry of CZTSe nanoparticles. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the nanocrystals were single phase polycrystalline with their size within the range of 25-30 nm. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy measurements ruled out the existence of secondary phases such as Cu2SnSe3 and ZnSe. The effect of reaction time and precursor injection order on the formation of stoichiometric CZTSe nanoparticles has been studied by Raman spectroscopy. UV-vis-NIR data indicate that the CZTSe nanocrystals have an optical band gap of 1.59 eV, which is optimal for photovoltaic applications.
Cu2ZnSnSe4因其诸多优点，如直接带隙、高吸收系数、低毒性以及其元素相对丰富（无铟），是薄膜太阳能电池中一种有前景的吸收材料。在本报告中，首次使用双（三乙基硅基）硒化物[(Et3Si)2Se]作为硒源，通过热注入法合成了CZTSe纳米颗粒。能量色散X射线光谱（EDS）证实了CZTSe纳米颗粒的化学计量。X射线衍射（XRD）和透射电子显微镜（TEM）研究表明，纳米晶体为单相多晶，其尺寸在25 - 30 nm范围内。X射线光电子能谱（XPS）和拉曼光谱测量排除了Cu2SnSe3和ZnSe等次生相的存在。通过拉曼光谱研究了反应时间和前驱体注入顺序对化学计量CZTSe纳米颗粒形成的影响。紫外 - 可见 - 近红外数据表明，CZTSe纳米晶体的光学带隙为1.59 eV，这对于光伏应用是最佳的。
