材料科学
钙钛矿(结构)
能量转换效率
水分
双层
图层(电子)
光伏系统
光电子学
扩散
降级(电信)
部分
化学工程
纳米技术
复合材料
化学
膜
有机化学
工程类
生态学
物理
热力学
生物
电信
生物化学
计算机科学
作者
Yuhang Liu,Seçkin Akın,Linfeng Pan,Ryusuke Uchida,Neha Arora,Jovana V. Milić,Alexander Hinderhofer,Frank Schreiber,Alexander R. Uhl,Shaik M. Zakeeruddin,Anders Hagfeldt,M. Ibrahim Dar,Michaël Grätzel
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2019-06-01
卷期号:5 (6)
被引量:585
标识
DOI:10.1126/sciadv.aaw2543
摘要
Preventing the degradation of metal perovskite solar cells (PSCs) by humid air poses a substantial challenge for their future deployment. We introduce here a two-dimensional (2D) A2PbI4 perovskite layer using pentafluorophenylethylammonium (FEA) as a fluoroarene cation inserted between the 3D light-harvesting perovskite film and the hole-transporting material (HTM). The perfluorinated benzene moiety confers an ultrahydrophobic character to the spacer layer, protecting the perovskite light-harvesting material from ambient moisture while mitigating ionic diffusion in the device. Unsealed 3D/2D PSCs retain 90% of their efficiency during photovoltaic operation for 1000 hours in humid air under simulated sunlight. Remarkably, the 2D layer also enhances interfacial hole extraction, suppressing nonradiative carrier recombination and enabling a power conversion efficiency (PCE) >22%, the highest reported for 3D/2D architectures. Our new approach provides water- and heat-resistant operationally stable PSCs with a record-level PCE.
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