A facile and low cost synthesis of earth abundant element Cu2ZnSnS4 (CZTS) nanocrystals: Effect of Cu concentrations
A facile and low cost synthesis of earth abundant element Cu2ZnSnS4 (CZTS) nanocrystals: Effect of Cu concentrations
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DOI：
10.1016/j.jallcom.2012.06.086
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发表时间：
2012-11
影响因子：
6.2
通讯作者：
S. Shin;J. Han;Chan Yeong Park;S. Kim;Y. Park;G. Agawane;A. V. Moholkar;J. Yun;C. Jeong;J. Y. Lee;J. H. Kim
中科院分区：
文献类型：
--
作者：
S. Shin;J. Han;Chan Yeong Park;S. Kim;Y. Park;G. Agawane;A. V. Moholkar;J. Yun;C. Jeong;J. Y. Lee;J. H. Kim
采用微波硫化法制备了Cu2ZnSnS4(CZTS)纳米晶(NCS)。研究了不同浓度(0.01~0.025M)的铜对CZTS纳米碳管的结构、形貌、成分、化学和光学性能的影响。X射线衍射图、X射线光电子能谱和透射电子显微镜结果表明，前驱体粉末含有几个未归属于CZTS、ZnS、Cu2-XS、Sn2S3和Cu2SnS3的宽峰。硫化后的NCS除在0.02M铜浓度下形成第二相外，其余均为开斯特型CZTS相和铜基和锡基第二相。电感耦合等离子体分析结果表明，从16.57%增加到32.94at.%，硫化CZTS纳米碳管中铜的含量增加，而锌和锡的含量随着铜含量的增加而减少。UV-Vis光谱结果表明，硫化碳纳米管在可见光区的吸收系数大于104 cm−1，且随着铜浓度的增加，硫化碳纳米管的带隙能从1.65 eV降至1.28 eV。
Cu2ZnSnS4(CZTS) nanocrystals (NCs) were synthesized by sulfurization of microwave assisted precursor powders without toxic chemicals. The effects of different Cu concentration from 0.01 to 0.025M on the structural, morphological, compositional, chemical and optical properties of CZTS NCs were investigated. X-ray diffraction patterns, X-ray photoelectron spectroscopy and transmission electron microscopy results showed that the precursor powder contains several broad peaks that could not be assigned to CZTS, ZnS, Cu2-xS, Sn2S3and Cu2SnS3. However, the sulfurized NCs showed both kesterite CZTS and Cu- and Sn-based secondary phases except for that formed at Cu concentration of 0.02M. Inductively coupled plasma (ICP) results showed that the presence of Cu in the sulfurized CZTS NCs increased with increasing Cu concentration from 16.57 to 32.94at.% while Zn and Sn in the sulfurized CZTS NCs decreased with increasing Cu concentration. UV–Vis spectroscopy results showed that the absorption coefficient of the sulfurized NCs was over 104cm−1in the visible region and band gap energy of the sulfurized CZTS NCs decreased from 1.65 to 1.28eV with increasing Cu concentration.