Phase-Selective Synthesis of Cu2ZnSnS4 Nanocrystals using Different Sulfur Precursors
Phase-Selective Synthesis of Cu2ZnSnS4 Nanocrystals using Different Sulfur Precursors
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DOI：
10.1021/ic500956n
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发表时间：
2014-10-20
影响因子：
4.6
通讯作者：
Lam, Yeng Ming
中科院分区：
文献类型：
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作者：
Li, Zhenggang;Lui, Alvic Lim Kar;Lam, Yeng Ming
Cu2ZnSnS4(CZTS)作为一种可持续、低成本的薄膜太阳能电池吸波材料具有广阔的应用前景。钙钛矿和纤锌矿是CZTS的两种常见物相。到目前为止，这两种相的合成和生长还不是很清楚。本工作分别以元素硫、十二硫醇和硫代乙酰胺为原料，制备了纤锌矿CZTS纳米粒子和纤锌矿CZTS纳米粒子，以及两种结构的CZTS纳米粒子。对硫源的反应速率进行了时间相关研究，发现硫源的反应速度是决定相形成的关键因素。单质硫与油胺反应生成高活性的小分子硫化氢，生成钾盐相。长链十二硫醇的反应途径是通过二元相形成纤锌矿相。硫代乙酰胺在最终产物中生成了纤锌矿和纤锌矿的混合物，并对其光学和电学性能进行了评价。
Cu2ZnSnS4 (CZTS) holds great promises as an absorber material for sustainable and low cost thin film solar cells. Kesterite and wurtzite are two common phases of CZTS. Until now, the synthesis and the growth of both phases are not clearly understood. In this work, kesterite CZTS nanoparticles, wurtzite CZTS nanoparticles as well as CZTS particles with a mixture of both structures were prepared by using elemental sulfur, 1-dodecanethiol, and thioacetamide, respectively. Time dependent studies were conducted and the reaction rate of sulfur source was found to be the key factor in determining the phase formation. Elemental sulfur reacts with oleylamine to produce highly reactive small molecule H2S, which leads to the formation of kesterite phase. The reaction pathways of the long alkane chain 1-dodecanethiol yield the formation of wurtzite phase via a binary phase. Thioacetamide yields a mixture of kesterite and wurtzite phase in the final product The optical and electrical properties of kesterite and wurtzite CZTS were also evaluated.