材料科学
掺杂剂
钝化
光电子学
钙钛矿(结构)
能量转换效率
碘化物
兴奋剂
半导体
纳米技术
化学
无机化学
图层(电子)
有机化学
作者
Xiao Sun,Zhen Li,Xinyu Yu,Xin Wu,Cheng Zhong,Danjun Liu,Dangyuan Lei,Alex K.‐Y. Jen,Zhong’an Li,Zonglong Zhu
标识
DOI:10.1002/ange.202016085
摘要
Abstract Currently, the performance improvement for inverted perovskite solar cells (PVSCs) is mainly limited by the high open circuit voltage ( V OC ) loss caused by detrimental non‐radiative recombination (NRR) processes. Herein, we report a simple and efficient way to simultaneously reduce the NRR processes inside perovskites and at the interface by rationally designing a new pyridine‐based polymer hole‐transporting material (HTM), PPY2 , which exhibits suitable energy levels with perovskites, high hole mobility, effective passivation of the uncoordinated Pb 2+ and iodide defects, as well as the capability of promoting the formation of high‐quality polycrystalline perovskite films. In absence of any dopants, the inverted PVSCs using PPY2 as the HTM deliver an encouraging PCE up to 22.41 % with a small V OC loss (0.40 V), among the best device performances for inverted PVSCs reported so far. Furthermore, PPY2 ‐based unencapsulated devices show an excellent long‐term photostability, and over 97 % of its initial PCE can be maintained after one sun constant illumination for 500 h.
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