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Hot Carrier Dynamics and Charge Trapping in Surface Passivated β-CsPbI3 Inorganic Perovskite
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-07-19 , DOI: 10.1021/acs.jpclett.1c01922
Xian Wang 1 , Dayujia Huo 1 , Xin Wang 1 , Minjie Li 1 , Yong Wang 2 , Yan Wan 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2021-07-19 , DOI: 10.1021/acs.jpclett.1c01922
Xian Wang 1 , Dayujia Huo 1 , Xin Wang 1 , Minjie Li 1 , Yong Wang 2 , Yan Wan 1
Affiliation
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Thermodynamically stable CsPbI3 inorganic perovskite has achieved high efficiency exceeding 20% with surface defect passivation, but a thorough understanding on the photophysics properties of surface passivated CsPbI3 inorganic perovskite is still lacking. Herein, we have used transient absorption spectroscopy to investigate the photophysical properties of β-CsPbI3 perovskites with and without passivation. The results indicate that the carrier trapping process has become slower because of the reduced deep defects that were varied to shallow defects due to surface passivation. The bimolecular recombination of β-CsPbI3 was also accelerated because of the improved carrier mobility after healing surface defects by passivation agents. Moreover, the efficient defect passivation can also elongate the hot carrier lifetime from 0.26 to 0.37 ps by impeding the charge trapping process. Our findings reveal that the defects passivation is beneficial to enhance defect tolerance, improve carrier transport, and slow down the hot carrier cooling for developing high-performance photovoltaics.
中文翻译：
表面钝化 β-CsPbI3 无机钙钛矿中的热载流子动力学和电荷俘获
热力学稳定的 CsPbI 3无机钙钛矿通过表面缺陷钝化实现了超过 20% 的高效率，但仍缺乏对表面钝化 CsPbI 3无机钙钛矿的光物理特性的透彻了解。在此，我们使用瞬态吸收光谱研究了钝化和未钝化的 β-CsPbI 3钙钛矿的光物理性质。结果表明载流子俘获过程变得更慢，因为减少了由于表面钝化而变成浅缺陷的深缺陷。β-CsPbI 3的双分子重组由于钝化剂修复表面缺陷后载流子迁移率提高，因此也加速了。此外，有效的缺陷钝化还可以通过阻碍电荷捕获过程将热载流子寿命从 0.26 ps 延长到 0.37 ps。我们的研究结果表明，缺陷钝化有利于提高缺陷容限，改善载流子传输，并减缓热载流子冷却，以开发高性能光伏。
更新日期：2021-07-29
中文翻译：
表面钝化 β-CsPbI3 无机钙钛矿中的热载流子动力学和电荷俘获
热力学稳定的 CsPbI 3无机钙钛矿通过表面缺陷钝化实现了超过 20% 的高效率，但仍缺乏对表面钝化 CsPbI 3无机钙钛矿的光物理特性的透彻了解。在此，我们使用瞬态吸收光谱研究了钝化和未钝化的 β-CsPbI 3钙钛矿的光物理性质。结果表明载流子俘获过程变得更慢，因为减少了由于表面钝化而变成浅缺陷的深缺陷。β-CsPbI 3的双分子重组由于钝化剂修复表面缺陷后载流子迁移率提高，因此也加速了。此外，有效的缺陷钝化还可以通过阻碍电荷捕获过程将热载流子寿命从 0.26 ps 延长到 0.37 ps。我们的研究结果表明，缺陷钝化有利于提高缺陷容限，改善载流子传输，并减缓热载流子冷却，以开发高性能光伏。
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