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Morphology Tuning and Its Role in Optimization of Perovskite Films Fabricated from A Novel Nonhalide Lead Source
Advanced Science ( IF 14.3 ) Pub Date : 2020-11-01 , DOI: 10.1002/advs.202002296 Jinwen Gu 1, 2 , Faming Li 1, 2 , Zenghui Wang 2 , Yiran Xie 1, 2 , Lihe Yan 3 , Peng Zeng 1, 2 , Hua Yu 4 , Mingzhen Liu 1, 2
Advanced Science ( IF 14.3 ) Pub Date : 2020-11-01 , DOI: 10.1002/advs.202002296 Jinwen Gu 1, 2 , Faming Li 1, 2 , Zenghui Wang 2 , Yiran Xie 1, 2 , Lihe Yan 3 , Peng Zeng 1, 2 , Hua Yu 4 , Mingzhen Liu 1, 2
Affiliation
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Usage of nonhalide lead sources for fabricating perovskite solar cells (PSCs) has recently attracted increasing attention as a promising route toward realizing high quality PSC devices. However, the unique role of nonhalide lead sources in improving perovskite film morphology and PSC performance has largely remained unexplored, impeding broader application of these materials. Here, it is demonstrated that by using a new nonhalide lead source, lead formate (Pb(HCOO)2), good control of perovskite film morphology can be achieved. With the usage of lead formate, PbI2 can nicely border the perovskite grain boundaries (GBs) and form domain “walls” that segregate the individual perovskite crystal domains. The PbI2 at the GBs lead to significant improvement in film quality and device performance through passivating the defects at the perovskite GBs and suppressing lateral carrier diffusion. An impressive carrier lifetime at the microsecond scale (τ2 = 1714 ns) is achieved, further with an optimal power conversion efficiency of 20.3% for the resulting devices. This work demonstrates a promising and effective method toward fabricating high‐quality perovskites and high‐efficiency PSCs.
中文翻译：
形态调整及其在由新型非卤化物铅源制备的钙钛矿薄膜优化中的作用
使用非卤化物铅源制造钙钛矿太阳能电池 (PSC) 作为实现高质量 PSC 器件的有前景的途径最近引起了越来越多的关注。然而，非卤化物铅源在改善钙钛矿薄膜形态和PSC性能方面的独特作用在很大程度上仍未得到探索，阻碍了这些材料的更广泛应用。在此，证明通过使用新型非卤化物铅源甲酸铅（Pb(HCOO) 2），可以实现对钙钛矿薄膜形貌的良好控制。通过使用甲酸铅，PbI 2可以很好地与钙钛矿晶界 (GB) 接壤，并形成隔离各个钙钛矿晶域的域“墙”。晶界处的PbI 2通过钝化钙钛矿晶界处的缺陷并抑制横向载流子扩散，导致薄膜质量和器件性能显着改善。实现了微秒级（τ 2 = 1714 ns）的令人印象深刻的载流子寿命，并且最终器件的最佳功率转换效率为 20.3%。这项工作展示了一种制造高质量钙钛矿和高效 PSC 的有前途且有效的方法。
更新日期：2020-12-03
中文翻译：
形态调整及其在由新型非卤化物铅源制备的钙钛矿薄膜优化中的作用
使用非卤化物铅源制造钙钛矿太阳能电池 (PSC) 作为实现高质量 PSC 器件的有前景的途径最近引起了越来越多的关注。然而，非卤化物铅源在改善钙钛矿薄膜形态和PSC性能方面的独特作用在很大程度上仍未得到探索，阻碍了这些材料的更广泛应用。在此，证明通过使用新型非卤化物铅源甲酸铅（Pb(HCOO) 2），可以实现对钙钛矿薄膜形貌的良好控制。通过使用甲酸铅，PbI 2可以很好地与钙钛矿晶界 (GB) 接壤，并形成隔离各个钙钛矿晶域的域“墙”。晶界处的PbI 2通过钝化钙钛矿晶界处的缺陷并抑制横向载流子扩散，导致薄膜质量和器件性能显着改善。实现了微秒级（τ 2 = 1714 ns）的令人印象深刻的载流子寿命，并且最终器件的最佳功率转换效率为 20.3%。这项工作展示了一种制造高质量钙钛矿和高效 PSC 的有前途且有效的方法。
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