Enhancement of photovoltaic performance of perovskite solar cells by modification of the interface between the perovskite and mesoporous TiO2 film
Enhancement of photovoltaic performance of perovskite solar cells by modification of the interface between the perovskite and mesoporous TiO2 film
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DOI：
10.1016/j.solmat.2016.05.004
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发表时间：
2016-10
影响因子：
6.9
通讯作者：
Yaru Hou;Junyou Yang;Q. Jiang;Weixin Li;Zhiwei Zhou;Xin Li;Shuqin Zhou
中科院分区：
文献类型：
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作者：
Yaru Hou;Junyou Yang;Q. Jiang;Weixin Li;Zhiwei Zhou;Xin Li;Shuqin Zhou
通过在Sr2+溶液中浸渍介孔TiO2薄膜并进行后续热处理，在介孔TiO2薄膜的表面形成了一层SrTiO3改性层，并详细研究了改性对钙钛矿型太阳电池光伏特性的影响。X射线光电子能谱(XPS)和透射电子显微镜(TEM)结果证实了钛酸锶改性层的存在和性质。通过对二氧化钛的表面改性，有效地改善了钙钛矿膜的形貌，改善了CH3NH3PbI3吸收剂的光吸收性能，实现了CH3NH3PbI3钙钛矿层与改性后的二氧化钛之间更快的电荷转移。结果表明，用10 mm的Sr2+溶液对介孔二氧化钛进行改性，制备的钙钛矿型太阳能电池的平均转换效率为11.4%，比裸介孔二氧化钛薄膜的7.8%的光伏效率提高了约46%。
By dipping the mesoporous TiO2film in Sr2+solutions and subsequent annealing, a modification layer of SrTiO3has been formed on the surface of the mesoporous TiO2film, and the effect of modification on the photovoltaic characteristics of the perovskite solar cells has been studied detailedly. The XPS and TEM results verified the existence and nature of the SrTiO3modification layer. Benifiting from the TiO2surface modification, the morphology of perovskite film and light absorption of the CH3NH3PbI3absorber have been improved effectively, and a faster charge transfer has also been achieved between the CH3NH3PbI3perovskite layer and the modified TiO2. As a result, an average conversion efficiency of 11.4% has been achieved in the perovskite solar cell based on the modified mesoporous TiO2by 10 mM Sr2+solution, and it increases approximately by 46% in comparison with the photovoltaic efficiency of 7.8% of the perovskite solar cell based the bare mesoporous TiO2layer.