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HI-assisted fabrication of Sn-doping TiO2 electron transfer layer for air-processed perovskite solar cells with high efficiency and stability
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.solmat.2020.110594
Yaxin Deng , Shuxian Li , Xin Li , Rui Wang

Abstract Effective electron transport layers (ETLs) provide enhanced charge separation and transport, therefore as a vital part in improving the efficiency of planar perovskite solar cells (PSCs). Herein, we report a new synergistic strategy using HI to passivate TiO2 film and surface while incorporating tin element into TiO2 ETL. HI is first used to control the hydrolysis of TiO2 precursors and eliminate oxygen vacancies related trap states. Then, tin element is incorporated into HI-passivated TiO2 precursor solution to construct composite TiO2/SnO2 film, affording increased electron mobility and suitable energy level. Moreover, the entire preparation process is performed under uncontrolled environmental conditions at 150 °C temperatures. Benefiting from the improved quality of the ETLs, the unencapsulated PSCs achieve optimized power conversion efficiency (PCE) of 17.77% with greatly improved stability. After storage in ambient for 1450 h, the device still maintains 92% of its initial efficiency, while hold 79% PCE after 7 h of 1 sun exposure and 86% PCE after heating at 100 °C for 21 h.

中文翻译:

高效率和稳定的空气处理钙钛矿太阳能电池用 Sn 掺杂 TiO2 电子传输层的 HI 辅助制造

摘要 有效的电子传输层 (ETL) 提供增强的电荷分离和传输,因此是提高平面钙钛矿太阳能电池 (PSC) 效率的重要组成部分。在此,我们报告了一种新的协同策略,使用 HI 钝化 TiO2 薄膜和表面,同时将锡元素加入 TiO2 ETL。HI 首先用于控制 TiO2 前驱体的水解并消除与陷阱态相关的氧空位。然后,将锡元素掺入到 HI 钝化的 TiO2 前驱体溶液中,构建复合 TiO2/SnO2 薄膜,提供更高的电子迁移率和合适的能级。此外,整个制备过程是在 150 °C 温度下不受控制的环境条件下进行的。受益于 ETL 质量的提高,未封装的 PSC 实现了 17.77% 的优化功率转换效率 (PCE),并大大提高了稳定性。在环境中储存 1450 小时后,该装置仍保持其初始效率的 92%,同时在 1 次阳光照射 7 小时后保持 79% 的 PCE,在 100°C 加热 21 小时后保持 86% 的 PCE。
更新日期:2020-09-01
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