Influence of Ag Layer Location on the Performance of Cu2ZnSnS4 Thin Film Solar Cells
Influence of Ag Layer Location on the Performance of Cu2ZnSnS4 Thin Film Solar Cells
复制标题
Ag层位置对Cu2ZnSnS4薄膜太阳能电池性能的影响
DOI：
10.1007/s11664-019-07890-4
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发表时间：
2019-12-23
影响因子：
2.1
通讯作者：
Ma, Xiaole
中科院分区：
文献类型：
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作者：
Gu, Kang;Hao, Ruiting;Ma, Xiaole
本工作采用多靶溅射方法制备了(Ag，Cu)_2ZnSnS_4(ACZTS)薄膜，形成了不同的层叠结构，即(S_1)锌锡/铜/银/钼、(锡)锌/银/铜/钼和锌/银/锡/铜/钼。堆积的前驱体通过软退火进行硫化，然后在标准大气压下充入氮气的室内进行两步硫化。X-射线光电子能谱元素分布显示薄膜中Ag的垂直分布不均匀。扫描电子显微镜和电子探针显微分析的结果表明，上表面的富银有利于晶粒度的增大。此外，还可以获得致密、均匀的表面，并保持元素组成的稳定性。优化银层排列顺序后，太阳电池的效率从1.30%提高到3.65%，提高了181%。开路电压从448 mV增加到630 mV，这是因为空洞减少，晶粒尺寸增大，CuZn反位缺陷减少。
In this work, the (Ag,Cu)2ZnSnS4 (ACZTS) thin films were fabricated via sputtering with a multi-target to form different layer stacks, i.e., (S1) ZnS/Sn/Cu/Ag/Mo,(S2) ZnS/Sn/Ag/Cu/Mo and (S3) ZnS/Ag/Sn/Cu/Mo. The stacked precursors were sulfurized through a soft annealing, followed by a two-step sulfurization in a chamber filled with N2 at standard atmospheric pressure. The x-ray photoelectron spectroscopy elemental profile showed a vertical non-uniform distribution of Ag in the film. Based on the results of scanning electron microscopy and electron probe microanalysis, Ag enrichment of the upper surface was beneficial for the grain size. Moreover, a dense, uniform surface could be obtained and the stability of the elemental composition could be maintained. After optimizing the order of the Ag layers, the efficiency of the solar cells increased from 1.30% to 3.65%, an improvement of 181%. The open circuit voltage is increased from 448 mV to 630 mV because of the reduced voids, increased grain size, and reduced CuZn antisite defects.