钝化
钙钛矿(结构)
材料科学
结晶
能量转换效率
氧化物
基质(水族馆)
光致发光
图层(电子)
载流子寿命
金属
光电子学
化学工程
纳米技术
硅
冶金
工程类
地质学
海洋学
作者
Bin Chen,Hao Chen,Yi Hou,Jian Xu,Sam Teale,Koen Bertens,Haijie Chen,Andrew H. Proppe,Qilin Zhou,Danni Yu,Kaimin Xu,Maral Vafaie,Yuan Liu,Yitong Dong,Eui Hyuk Jung,Chao Zheng,Tong Zhu,Zhijun Ning,Edward H. Sargent
标识
DOI:10.1002/adma.202103394
摘要
Abstract The open‐circuit voltage ( V oc ) of perovskite solar cells is limited by non‐radiative recombination at perovskite/carrier transport layer (CTL) interfaces. 2D perovskite post‐treatments offer a means to passivate the top interface; whereas, accessing and passivating the buried interface underneath the perovskite film requires new material synthesis strategies. It is posited that perovskite ink containing species that bind strongly to substrates can spontaneously form a passivating layer with the bottom CTL. The concept using organic spacer cations with rich NH 2 groups is implemented, where readily available hydrogens have large binding affinity to under‐coordinated oxygens on the metal oxide substrate surface, inducing preferential crystallization of a thin 2D layer at the buried interface. The passivation effect of this 2D layer is examined using steady‐state and time‐resolved photoluminescence spectroscopy: the 2D interlayer suppresses non‐radiative recombination at the buried perovskite/CTL interface, leading to a 72% reduction in surface recombination velocity. This strategy enables a 65 mV increase in V oc for NiO x based p–i–n devices, and a 100 mV increase in V oc for SnO 2 ‐based n–i–p devices. Inverted solar cells with 20.1% power conversion efficiency (PCE) for 1.70 eV and 22.9% PCE for 1.55 eV bandgap perovskites are demonstrated.
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