咪唑
材料科学
结合能
激子
结晶学
立体化学
凝聚态物理
原子物理学
化学
物理
作者
Ying Zhou,Yiqing Zhang,Lin Zhang,Haotian Wu,Yu Zhou,Xiaoyi Xu,Jinyang Yu,Xiaoling Wu,Jiamin Xie,Weifei Fu,Gang Wu,Hongzheng Chen
标识
DOI:10.1002/adfm.202408774
摘要
Abstract 2D Dion–Jacobson (2D DJ) perovskites are considered as promising photovoltaic materials due to their structural stability and spacer designability. Here, a spacer cation with an aromatic imidazole ring, 2‐(1H‐imidazol‐2‐yl)ethylammonium (HE), is successfully applied to construct 2D DJ perovskite. It's found that the high polarity of the HE spacer strengthens the interaction between organic and inorganic layers and reduces the exciton binding energy to 67.8 meV, resulting in promoted charge dissociation, compared with the aliphatic 1,4‐butanediammonium (BDA) spacer with a similar length. The HE spacer enlarges the micelle size in precursor solution and suppresses the formation of low‐n value phases. In consequence, the HE‐based perovskite film exhibits better quality than the BDA‐based one, with lower defect density and longer carrier lifetime. The optimized device based on (HE)(MA 0.75 FA 0.25 ) 4 Pb 5 I 16 film achieves a champion power conversion efficiency up to 18.40%, much higher than that of the BDA‐based device (15.03%). Besides, the unencapsulated device based HE exhibits improved moisture and thermal stability.
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