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High-performance perovskite solar cells based on passivating interfacial and intergranular defects
Solar Energy Materials and Solar Cells ( IF 6.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.solmat.2020.110555
Pengfei Liu , Zhiyong Liu , Chaochao Qin , Tingwei He , Bingxin Li , Lin Ma , Kausar Shaheen , Jien Yang , Haigang Yang , Hairui Liu , Kaikai Liu , Mingjian Yuan

Abstract Planar-structure perovskite solar cells have attracted more and more attention, because their simple and low-temperature preparation processing. However, the performance of perovskite solar cells is currently limited by defect-induced recombination at interfaces between perovskite and charge transport layers. In this work, a filmy poly methyl methacrylate (PMMA) layer introduced in Perovskite/Spiro-OMeTAD interface to passivate the interfacial and interganular defects, by which a high open-circuit voltage (1.18 V) is acquired, and the optimal device shows a steady-state power conversion efficiency of 20.5% and negligible hysteresis. Femtosecond transient absorption measurement confirms a significant reduction in non-radiative recombination for passivated devices. Mott-Schottky measurement indicates improved flat band potential and carrier density in passivated devices, consisting with the increased voltage. In addition, PMMA film can protect perovskite film from moisture and oxygen erosion. The unsealed device still maintains 95% of the initial efficiency under ambient conditions with 60% relative humidity for one month. This approach solves one of the main limitations of interfacial recombination and shows its potential to improve the performance of perovskite solar cells in the future.

中文翻译:

基于钝化界面和晶间缺陷的高性能钙钛矿太阳能电池

摘要 平面结构钙钛矿太阳能电池因其制备工艺简单、制备温度低而受到越来越多的关注。然而,钙钛矿太阳能电池的性能目前受到钙钛矿和电荷传输层之间界面处缺陷诱导复合的限制。在这项工作中,在钙钛矿/Spiro-OMeTAD 界面中引入薄膜聚甲基丙烯酸甲酯 (PMMA) 层以钝化界面和晶间缺陷,从而获得高开路电压 (1.18 V),最佳器件显示出稳态功率转换效率为 20.5%,滞后可忽略不计。飞秒瞬态吸收测量证实了钝化器件的非辐射复合显着减少。Mott-Schottky 测量表明钝化器件中的平带电位和载流子密度得到改善,包括增加的电压。此外,PMMA薄膜可以保护钙钛矿薄膜免受水分和氧气的侵蚀。未密封的设备在环境条件下,相对湿度为 60% 的情况下,1 个月内仍能保持初始效率的 95%。这种方法解决了界面复合的主要限制之一,并显示了其在未来提高钙钛矿太阳能电池性能的潜力。
更新日期:2020-08-01
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