Self-Organized Back Surface Field to Improve the Performance of Cu2ZnSn(S,Se)(4) Solar Cells by Applying P-Type MoSe2:Nb to the Back Electrode Interface
Self-Organized Back Surface Field to Improve the Performance of Cu2ZnSn(S,Se)(4) Solar Cells by Applying P-Type MoSe2:Nb to the Back Electrode Interface
复制标题
通过将 P 型 MoSe2:Nb 应用于背电极界面，自组织背表面场可提高 Cu2ZnSn(S,Se)(4) 太阳能电池的性能
DOI：
10.1021/acsami.9b08946
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发表时间：
2019
影响因子：
9.5
通讯作者：
Zhao Haifeng
中科院分区：
文献类型：
--
作者：
Song Yanping;Yao Bin;Li Yongfeng;Ding Zhanhui;Sun Huanhuan;Zhang Zhenzhong;Zhang Ligong;Zhao Haifeng
自2014年Kim等人获得12.7%的冠军功率转换效率（PCE）以来，Cu2ZnSn(S,Se)4（CZTSSe）薄膜太阳能电池一直遇到瓶颈期。阻碍其进一步发展的关键因素之一是严重的界面载流子复合导致的较低的开路电压（VOC）。因此，采用后表面场（BSF）在一定程度上是解决CZTSSe太阳能电池voc问题的可行策略。在这里，我们展示了一个自组织的BSF，通过Nb掺杂（p-MoSe2:Nb），促使界面mose2层从固有的n型转变为理想的p型。BSF的应用可以显著减少后电极界面（BEI）载流子复合，降低后电极接触势垒高度。由于voc和填充因子的增强，相应电池的PCE从4.72提高到7.15%，主要是由于BSF引起的分流电阻（RSh）增加，串联电阻（RS）降低，以及BEI的重组速度减缓。我们的研究结果表明，引入p-MoSe2:Nb填充的BSF是提高CZTSSe薄膜太阳能电池性能的一种简单而有前途的途径。
Cu2ZnSn(S,Se)4(CZTSSe) thin-film solar cells have been encountering a bottleneck period since the champion power conversion efficiency (PCE) of 12.7% was achieved by Kim et al. in 2014. One of the critical factors that impede its further development is the relatively low open-circuit voltage (VOC) caused by serious interface carrier recombination. In this regard, back surface field (BSF) employment is a feasible strategy to address theVOCissue of CZTSSe solar cells to some extent. Here, we demonstrated a self-organized BSF introduced by prompting interfacial MoSe2layer transition from inherent n-type to desirable p-type with Nb doping (p-MoSe2:Nb). The BSF application can significantly reduce the carrier recombination at the back electrode interface (BEI) and lower down the back contact barrier height. The PCE of the corresponding cell was improved from 4.72 to 7.15% because of the enhancement ofVOCand fill factor, primarily stemming from the doubling aspects of increased shunt resistance (RSh), decreased series resistance (RS), and alleviative recombination velocity of the BEI induced by the BSF. Our results suggest that introducing a BSF fulfilled with p-MoSe2:Nb is a facile and promising route to improve the performance of CZTSSe thin-film solar cells.