结晶度
材料科学
能量转换效率
钙钛矿(结构)
化学工程
碘化物
异质结
化学稳定性
化学键
无机化学
光电子学
有机化学
复合材料
化学
工程类
作者
Jiangzhao Chen,Xing Zhao,Seul‐Gi Kim,Nam‐Gyu Park
标识
DOI:10.1002/adma.201902902
摘要
Abstract Chemical interaction at a heterojunction interface induced by an appropriate chemical linker is of crucial importance for high efficiency, hysteresis‐less, and stable perovskite solar cells (PSCs). Effective interface engineering in PSCs is reported via a multifunctional chemical linker of 4‐imidazoleacetic acid hydrochloride (ImAcHCl) that can provide a chemical bridge between SnO 2 and perovskite through an ester bond with SnO 2 via esterification reaction and an electrostatic interaction with perovskite via imidazolium cation in ImAcHCl and iodide anion in perovskite. In addition, the chloride anion in ImAcHCl plays a role in the improvement of crystallinity of perovskite film crystallinity. The introduction of ImAcHCl onto SnO 2 realigns the positions of the conduction and valence bands upwards, reduces nonradiative recombination, and improves carrier life time. As a consequence, average power conversion efficiency (PCE) is increased from 18.60% ± 0.50% to 20.22% ± 0.34% before and after surface modification, respectively, which mainly results from an enhanced voltage from 1.084 ± 0.012 V to 1.143 ± 0.009 V. The best PCE of 21% is achieved by 0.1 mg mL −1 ImAcHCl treatment, along with negligible hysteresis. Moreover, an unencapsulated device with ImAcHCl‐modified SnO 2 shows much better thermal and moisture stability than unmodified SnO 2 .
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