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用于太阳能电池的钙钛矿吸收体中光致光学瞬态的差异。

Differences in photoinduced optical transients in perovskite absorbers for solar cells.

作者信息

Pydzińska Katarzyna, Karolczak Jerzy, Szafrański Marek, Ziółek Marcin

机构信息

Faculty of Physics, Adam Mickiewicz University in Poznań Umultowska 85 61-614 Poznań Poland

Center for Ultrafast Laser Spectroscopy, Adam Mickiewicz University in Poznań Umultowska 85 61-614 Poznań Poland.

出版信息

RSC Adv. 2018 Feb 9;8(12):6479-6487. doi: 10.1039/c8ra00579f. eCollection 2018 Feb 6.

DOI:10.1039/c8ra00579f
PMID:35540378
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9078339/
Abstract

Methylammonium lead iodide films and powdered crystals were studied by time-resolved absorption and emission spectroscopy on the time scales from femtoseconds to nanoseconds. Strikingly different transient absorption signals were observed, changing from strong long-wavelength band-edge bleach to weak signatures of band-shift, which depended on the absorber form (films or polycrystals) and preparation method (stoichiometric or non-stoichiometric). The observed differences were correlated with the variation in absorption and emission spectra, changes in photo-induced carrier lifetimes and solar cell efficiency. These differences also pointed out that similar perovskite absorbers can provide significantly different transient responses and emphasize that special care must be taken when interpolating the obtained findings to the processes occurring in the most efficient devices.

摘要

采用时间分辨吸收和发射光谱技术，在飞秒到纳秒的时间尺度上对甲基碘化铅薄膜和粉末晶体进行了研究。观察到显著不同的瞬态吸收信号，从强的长波长带边漂白转变为弱的带移特征，这取决于吸收体的形式（薄膜或多晶）和制备方法（化学计量或非化学计量）。观察到的差异与吸收和发射光谱的变化、光生载流子寿命的变化以及太阳能电池效率相关。这些差异还指出，类似的钙钛矿吸收体可以提供显著不同的瞬态响应，并强调在将所得结果推断到最有效器件中发生的过程时必须格外小心。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/bb1b9762bd89/c8ra00579f-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/9aa03b50dfc3/c8ra00579f-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/2c3c7b898c1b/c8ra00579f-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/bb1b9762bd89/c8ra00579f-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/9aa03b50dfc3/c8ra00579f-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/1f1b0323cc99/c8ra00579f-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/c6d7fdab7b99/c8ra00579f-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/2c3c7b898c1b/c8ra00579f-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7e5e/9078339/bb1b9762bd89/c8ra00579f-f5.jpg

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