钝化
钙钛矿(结构)
材料科学
能量转换效率
热稳定性
离子键合
化学工程
异质结
光电子学
纳米技术
化学
图层(电子)
结晶学
离子
有机化学
工程类
作者
Xiaoyuan Liu,Jiyoung Min,Qian Chen,Tuo Liu,Geping Qu,Pengfei Xie,Hui Xiao,Juin‐Jei Liou,Jin Young Park,Zong-Xiang Xu
标识
DOI:10.1002/anie.202117303
摘要
Defects and energy offsets at the bulk and heterojunction interfaces of perovskite are detrimental to the efficiency and stability of perovskite solar cells (PSCs). Herein, we designed an amphiphilic π-conjugated ionic compound (QAPyBF4 ), implementing simultaneous defects passivation and interface energy level alignments. The p-type conjugated cations passivated the surface trap states and optimized energy alignment at the perovskite/hole transport layer. The highly electronegative [BF4 ]- enriched at the SnO2 interface featured desired band alignment due to the dipole moment of this interlayer. The planar n-i-p PSC had an efficiency of 23.1 % with Voc of 1.2 V. Notably, the synergy effect elevated the intrinsic endothermic decomposition temperature of the perovskite. The modified devices showed excellent long-term thermal (85 °C) and operational stability at the maximum power point for 1000 h at 45 °C under continuous one-sun illumination with no appreciable efficiency loss.
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