钙钛矿(结构)
串联
材料科学
双功能
带隙
热稳定性
化学工程
卤化物
纳米技术
化学
光电子学
无机化学
结晶学
复合材料
有机化学
催化作用
工程类
作者
Fazheng Qiu,Minghua Li,Jinpeng Wu,Jin‐Song Hu
标识
DOI:10.1016/j.jechem.2023.10.053
摘要
CsPbI2Br perovskite solar cells (PSCs) have drawn tremendous attention due to their suitable bandgap, excellent photothermal stability, and great potential as an ideal candidate for top cells in tandem solar cells. However, the abundant defects at the buried interface and perovskite layer induce severe charge recombination, resulting in the open-circuit voltage (Voc) output and stability much lower than anticipated. Herein, a novel buried interface management strategy is developed to regulate interfacial carrier dynamics and CsPbI2Br defects by introducing ammonium tetrafluoroborate (NH4BF4), thereby resulting in both high CsPbI2Br crystallization and minimized interfacial energy losses. Specifically, NH4+ ions could preferentially heal hydroxyl groups on the SnO2 surface and balance energy level alignment between SnO2 and CsPbI2Br, enhancing charge transport efficiency, while BF4− anions as a quasi-halogen regulate crystal growth of CsPbI2Br, thus reducing perovskite defects. Additionally, it is proved that eliminating hydroxyl groups at the buried interface enhances the iodide migration activation energy of CsPbI2Br for strengthening the phase stability. As a result, the optimized CsPbI2Br PSCs realize a remarkable efficiency of 17.09% and an ultrahigh Voc output of 1.43 V, which is one of the highest values for CsPbI2Br PSCs.
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