材料科学
钙钛矿(结构)
钝化
结晶度
电导率
掺杂剂
兴奋剂
能量转换效率
光电子学
化学工程
纳米技术
图层(电子)
复合材料
工程类
物理化学
化学
作者
Hao Sun,Danyan Xie,Zhen Song,Chang-Min Liang,Lingbo Xu,Xianlin Qu,Yuxin Yao,Li Deng,Hang Zhai,Kun Zheng,Can Cui,Yiying Zhao
标识
DOI:10.1021/acsami.0c03180
摘要
Numerous trap states and low conductivity of compact TiO2 layers are major obstacles for achieving high power conversion efficiency and high-stability perovskite solar cells. Here we report an effective Na2S-doped TiO2 layer, which can improve the conductivity of TiO2 layers, the contact of the TiO2/perovskite interface, and the crystallinity of perovskite layers. Comprehensive investigations demonstrate that Na cations increase the conductivity of TiO2 layers while S anions change the wettability of TiO2 layers, thus improving the crystallinity of perovskite layers and passivate defects at the TiO2/PVK interface. The synergetic effects of dopants lead to a champion efficiency as high as 21.25% in unencapsulated perovskite solar cells (PSCs), with much-improved stability. Our work provides new insights on anion dopants in TiO2 layers, which is usually neglected in previous reports, and also proposes a simple approach to produce low-cost and high-performance electron transport layers for high-performance PSCs.
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