材料科学
钙钛矿(结构)
齿合度
螯合作用
配体(生物化学)
晶界
化学工程
化学
金属
微观结构
冶金
复合材料
工程类
生物化学
受体
作者
Baibai Liu,Xiaodong Ren,Ru Li,Yu Chen,Dongmei He,Yong Li,Qian Zhou,Danqing Ma,Xiang Han,Xuxia Shai,Ke Yang,Shirong Lu,Zhengfu Zhang,Jing Feng,Cong Chen,Jianhong Yi,Jiangzhao Chen
标识
DOI:10.1002/adma.202312679
摘要
The instability of top interface induced by interfacial defects and residual tensile strain hinders the realization of long-term stable n-i-p regular perovskite solar cells (PSCs). Herein, one molecular locking strategy is reported to stabilize top interface by adopting polydentate ligand green biomaterial 2-deoxy-2,2-difluoro-d-erythro-pentafuranous-1-ulose-3,5-dibenzoate (DDPUD) to manipulate the surface and grain boundaries of perovskite films. Both experimental and theoretical evidence collectively uncover that the uncoordinated Pb2+ ions, halide vacancy, and/or I─Pb antisite defects can be effectively healed and locked by firm chemical anchoring on the surface of perovskite films. The ingenious polydentate ligand chelating is translated into reduced interfacial defects, increased carrier lifetimes, released interfacial stress, and enhanced moisture resistance, which should be liable for strengthened top interface stability and inhibited interfacial nonradiative recombination. The universality of the molecular locking strategy is certified by employing different perovskite compositions. The DDPUD modification achieves an enhanced power conversion efficiency (PCE) of 23.17-24.47%, which is one of the highest PCEs ever reported for the devices prepared in ambient air. The unsealed DDPUD-modified devices maintain 98.18% and 88.10% of their initial PCEs after more than 3000 h under a relative humidity of 10-20% and after 1728 h at 65 °C, respectively.
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