钋
钝化
钙钛矿(结构)
超快激光光谱学
离子键合
飞秒
化学物理
光谱学
材料科学
光激发
载流子寿命
光电子学
化学工程
化学
纳米技术
物理
离子
激发态
有机化学
光学
高分子化学
硅
激光器
工程类
图层(电子)
量子力学
核物理学
作者
Weiting Zhang,Jiancong Zheng,Wei Huang,Min Zhao,Bibiao Jiang,Hongtao Bian,Yu Fang
标识
DOI:10.1021/acs.jpcc.3c06371
摘要
All-inorganic perovskite solar cells (PSCs) have garnered significant attention due to their straightforward fabrication process and outstanding photophysical properties in the realm of optoelectronic devices. Nevertheless, the preparation and operation of perovskite solutions can introduce various defects, which adversely impact the recombination of photogenerated carriers, stability, and hamper photoelectric conversion. Consequently, enhancing perovskite stability remains a challenge in practical applications. One effective approach to improving stability involves the procedure of defect passivation for perovskite films. In this study, tetrabutylphosphine bromide ionic liquids (ILs) were chosen as passivating agents for CsPbBr3 perovskite films and the passivation mechanism was investigated systematically. A one-step spin-coating method was employed for post-treatment, aimed at minimizing defect formation and suppressing nonradiative recombination. A range of characterization techniques, including Fourier infrared transform spectroscopy, steady-state fluorescence spectroscopy, and ultrafast femtosecond transient absorption (fs-TA) spectroscopy, were employed to comprehensively investigate the carrier cooling and recombination processes in the perovskite films. The obtained results are anticipated to offer valuable insights into comprehending the passivation mechanism and the photophysical phenomena related to carrier generation and relaxation in perovskite materials following photoexcitation.
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