ZnO nanowire based CIGS solar cell and its efficiency enhancement by the piezo-phototronic effect
ZnO nanowire based CIGS solar cell and its efficiency enhancement by the piezo-phototronic effect
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基于 ZnO 纳米线的 CIGS 太阳能电池及其通过压电光电子效应提高效率
DOI：
10.1016/j.nanoen.2018.04.070
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发表时间：
2018-07-01
期刊：
影响因子：
17.6
通讯作者：
Pan, Caofeng
中科院分区：
文献类型：
--
作者：
Qiao, Shuang;Liu, Jihong;Pan, Caofeng
Cu（In，Ga）Se-2（CIGS）基异质结被认为是最有前途的薄膜太阳能电池之一。然而，考虑到成本竞争力，研究人员仍在寻求新的方法来提高功率转换效率（PCE）。本文首次将ZnO纳米线引入CIGS基太阳能电池中，以替代ZnO薄膜，更好地发挥其压电效应。有趣的是，太阳能电池表现出非常好的光伏性能，对于刚性器件的PCE为9.83%，对于柔性器件的PCE为5.43%，其PCE甚至大于相应的ZnO膜CIGS器件的PCE。此外，通过ZnO纳米线的压电光电效应，当垂直压力从0增加到2 MPa时，刚性器件的光电转换效率从9.83%提高到11.40%，而当外部应变从0.74%拉应变到-0.74%压应变时，柔性器件的光电转换效率从4.82%提高到5.96%。本研究表明，引入ZnO纳米线以及相关的压电光电效应提供了一个理想的途径，提高CIGS基太阳能电池的性能。
Cu(In,Ga)Se-2(CIGS)-based heterostructures have been thought to be one of the most prospective thin film solar cells. However, considering cost competitiveness, researchers are still seeking for new methods to improve the power conversion efficiency (PCE). In this work, the ZnO nanowires are first introduced into the CIGS-based solar cells to substitute the ZnO film for well developing the piezoelectric effect. Interestingly, the solar cells exhibit very good photovoltaic performances with PCE of 9.83% for rigid device and 5.43% for flexible device, the PCE of which is even larger than that of the corresponding ZnO film CIGS devices. Moreover, by exerting piezo-phototronic effect of the ZnO nanowires, the PCE of the rigid device is modulated from 9.83% to 11.40% with vertical pressure increasing from 0 to 2 MPa, and the PCE of the flexible device improves from 4.82% to 5.96% with external strain changing from a 0.74% tensile strain to a -0.74% compressive strain. This study demonstrates that introducing ZnO nanowires as well as the associated piezo-phototronic effect provides an ideal approach for improving the performances of CIGS-based solar cells.