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Surface Rutilization of Anatase TiO2 for Efficient Electron Extraction and Stable Pmax Output of Perovskite Solar Cells
Chem ( IF 23.5 ) Pub Date : 2018-03-08 , DOI: 10.1016/j.chempr.2018.01.018
Jianqiang Luo , Jiazang Chen , Bo Wu , Teck Wee Goh , Wei Qiao , Zhiliang Ku , Hong Bin Yang , Liping Zhang , Tze Chien Sum , Bin Liu

High-performance perovskite solar cells require efficient extraction of photogenerated electrons from the light absorber to the semiconductor skeleton, which can simultaneously stabilize the photovoltaic device by kinetically suppressing superoxide-intermediated degradation by reducing the accumulation of electrons in the perovskite layer. Here, we propose to improve and stabilize the photovoltaic performance of the cells by modulating the surface structures of TiO2. The transformed rutilized phase not only bridges the perovskite-TiO2 interfacial charge transfer but also protects the light absorber from ultraviolet-induced degradation by suppressing the survival of holes generated in the TiO2 skeleton. As a result of these merits, an increment of 50% in power conversion efficiency can be achieved. Furthermore, these cells exhibit extraordinary stability under continuous (120 hr) power-maximum output without cell encapsulation in the presence of moisture, oxygen, and ultraviolet irradiation and can restore to their initial photovoltaic performance by repeatedly undergoing tetragonal-to-cubic phase transition of the perovskite.



中文翻译:

锐钛矿型TiO 2的表面重金属化用于钙钛矿型太阳能电池的高效电子提取和稳定的P max输出

高性能钙钛矿太阳能电池需要从光吸收剂到半导体骨架的光生电子的有效提取,通过减少钙钛矿层中电子的积累,通过动力学抑制超氧化物介导的降解,可以同时稳定光伏器件。在这里,我们提出通过调节TiO 2的表面结构来改善和稳定电池的光伏性能。转化的rutilized相不仅桥接钙钛矿-TiO 2界面电荷转移,而且还通过抑制TiO 2中产生的空穴的存活来保护光吸收剂免受紫外线引起的降解。骨骼。这些优点的结果是,可以使功率转换效率提高50%。此外,这些电池在持续的(120小时)最大功率输出下表现出非凡的稳定性,而无需在水分,氧气和紫外线照射下进行封装,并且可以通过反复经历四方晶系到立方晶系的相变来恢复其初始光伏性能。钙钛矿。

更新日期:2018-03-08
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