A facile and low-cost synthesis of promising absorber materials on Cu2ZnSn(Sx,Se1-x)4 nanocrystals consisting of earth abundant elements with tunable band gap characteristics
A facile and low-cost synthesis of promising absorber materials on Cu2ZnSn(Sx,Se1-x)4 nanocrystals consisting of earth abundant elements with tunable band gap characteristics
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DOI：
10.1039/c2jm33802e
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发表时间：
2012-10-28
影响因子：
--
通讯作者：
Kim, Jin Hyeok
中科院分区：
文献类型：
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作者：
Shin, Seung Wook;Han, Jun Hee;Kim, Jin Hyeok
在本文中，我们报道了一种简单，低成本的kesterite Cu2ZnSn(S-x,Se1-x)(4) （CZTSSe）纳米晶体（NCs）的合成和表征方法，该方法涉及基于溶液的前驱体和后退火路线。研究了350 ~ 550℃不同Se蒸发温度对CZTSSe NCs结构、化学、组成和光学性能的影响。x射线衍射图、拉曼光谱和透射电镜结果表明，前驱体粉末呈现出多个不属于Cu2ZnSnS4 （CZTS）、ZnS、Cu2-xS、Sn2S3和Cu2SnS3的宽峰。然而，经过和未经过Se蒸发的NCs均为单一的kesterite CZTS相，没有二次相。紫外可见光谱结果表明，退火后的NCs在可见光区吸收系数均大于10(4)cm(-1)，光学带隙能量随Se蒸发温度的升高从1.46 eV降至1.14 eV。
In this paper, we report a facile, low cost synthesis and characterization of kesterite Cu2ZnSn(S-x,Se1-x)(4) (CZTSSe) nanocrystals (NCs) by a two-step process involving a solution-based precursor and a post-annealing route. The effects of different Se vaporization temperatures, ranging from 350 degrees C to 550 degrees C, on the structural, chemical, compositional, and optical properties of CZTSSe NCs were investigated. X-ray diffraction patterns, Raman spectroscopy, and transmission electron microscopy results indicated that the precursor powder showed several broad peaks that could not be assigned to Cu2ZnSnS4 (CZTS), ZnS, Cu2-xS, Sn2S3 and Cu2SnS3. However, the post-annealed NCs with and without Se vaporization were a single kesterite CZTS phase without a secondary phase. UV-vis spectroscopy results showed that the absorption coefficients of all the post-annealed NCs were over 10(4) cm(-1) in the visible region, and the optical band gap energy decreased systematically from 1.46 eV to 1.14 eV with increasing Se vaporization temperatures.