材料科学
钙钛矿(结构)
能量转换效率
光伏
光电子学
甲胺
掺杂剂
带隙
钙钛矿太阳能电池
二甲胺
光伏系统
纳米技术
化学工程
兴奋剂
化学
有机化学
电气工程
工程类
作者
Hao Chen,Qi Wei,Makhsud I. Saidaminov,Fei Wang,Andrew Johnston,Yi Hou,Zijian Peng,Kaimin Xu,Wenjia Zhou,Zhenghao Liu,Liang Qiao,Xiao Wang,Siwen Xu,Jiangyu Li,Run Long,Youqi Ke,Edward H. Sargent,Zhijun Ning
标识
DOI:10.1002/adma.201903559
摘要
Large-bandgap perovskites offer a route to improve the efficiency of energy capture in photovoltaics when employed in the front cell of perovskite-silicon tandems. Implementing perovskites as the front cell requires an inverted (p-i-n) architecture; this architecture is particularly effective at harnessing high-energy photons and is compatible with ionic-dopant-free transport layers. Here, a power conversion efficiency of 21.6% is reported, the highest among inverted perovskite solar cells (PSCs). Only by introducing a secondary amine into the perovskite structure to form MA1-x DMAx PbI3 (MA is methylamine and DMA is dimethylamine) are defect density and carrier recombination suppressed to enable record performance. It is also found that the controlled inclusion of DMA increases the hydrophobicity and stability of films in ambient operating conditions: encapsulated devices maintain over 80% of their efficiency following 800 h of operation at the maximum power point, 30 times longer than reported in the best prior inverted PSCs. The unencapsulated devices show record operational stability in ambient air among PSCs.
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