钙钛矿(结构)
钝化
材料科学
声子
自发辐射
甲胺
能量转换效率
电子
带隙
辐射传输
联轴节(管道)
凝聚态物理
化学物理
光电子学
化学
分子物理学
纳米技术
物理
光学
结晶学
量子力学
激光器
有机化学
图层(电子)
冶金
作者
Ruikun Cao,Kexuan Sun,Chang Liu,Yuhong Mao,Wei Guo,Ouyang Ping,Yuanyuan Meng,Ruijia Tian,Lisha Xie,Xujie Lü,Ziyi Ge
标识
DOI:10.1007/s40820-024-01401-9
摘要
Abstract This study presents experimental evidence of the dependence of non-radiative recombination processes on the electron–phonon coupling of perovskite in perovskite solar cells (PSCs). Via A-site cation engineering, a weaker electron–phonon coupling in perovskite has been achieved by introducing the structurally soft cyclohexane methylamine (CMA + ) cation, which could serve as a damper to alleviate the mechanical stress caused by lattice oscillations, compared to the rigid phenethyl methylamine (PEA + ) analog. It demonstrates a significantly lower non-radiative recombination rate, even though the two types of bulky cations have similar chemical passivation effects on perovskite, which might be explained by the suppressed carrier capture process and improved lattice geometry relaxation. The resulting PSCs achieve an exceptional power conversion efficiency (PCE) of 25.5% with a record-high open-circuit voltage ( V OC ) of 1.20 V for narrow bandgap perovskite (FAPbI 3 ). The established correlations between electron–phonon coupling and non-radiative decay provide design and screening criteria for more effective passivators for highly efficient PSCs approaching the Shockley–Queisser limit.
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