钝化
钙钛矿(结构)
材料科学
磁滞
聚合物
卤化物
能量转换效率
图层(电子)
佩多:嘘
化学工程
钙钛矿太阳能电池
光电子学
化学
无机化学
纳米技术
复合材料
工程类
物理
量子力学
作者
Bhumika Chaudhary,Ashish Kulkarni,Ajay Kumar Jena,Machiko Ikegami,Yosuke Udagawa,Hideyuki Kunugita,Kazuhiro Ema,Tsutomu Miyasaka
出处
期刊:Chemsuschem
[Wiley]
日期:2017-05-02
卷期号:10 (11): 2473-2479
被引量:154
标识
DOI:10.1002/cssc.201700271
摘要
It is well known that the surface trap states and electronic disorders in the solution-processed CH3 NH3 PbI3 perovskite film affect the solar cell performance significantly and moisture sensitivity of photoactive perovskite material limits its practical applications. Herein, we show the surface modification of a perovskite film with a solution-processable hydrophobic polymer (poly(4-vinylpyridine), PVP), which passivates the undercoordinated lead (Pb) atoms (on the surface of perovskite) by its pyridine Lewis base side chains and thereby eliminates surface-trap states and non-radiative recombination. Moreover, it acts as an electron barrier between the perovskite and hole-transport layer (HTL) to reduce interfacial charge recombination, which led to improvement in open-circuit voltage (Voc ) by 120 to 160 mV whereas the standard cell fabricated in same conditions showed Voc as low as 0.9 V owing to dominating interfacial recombination processes. Consequently, the power conversion efficiency (PCE) increased by 3 to 5 % in the polymer-modified devices (PCE=15 %) with Voc more than 1.05 V and hysteresis-less J-V curves. Advantageously, hydrophobicity of the polymer chain was found to protect the perovskite surface from moisture and improved stability of the non-encapsulated cells, which retained their device performance up to 30 days of exposure to open atmosphere (50 % humidity).
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