Photoinduced large polaron transport and dynamics in organic–inorganic hybrid lead halide perovskite with terahertz probes

Zuanming, J.; Peng, Y.; Fang, Y.; Ye, Z.; Fan, Z.; Liu, Z.; Bao, X.; Gao, H.; Ren, W.; Wu, J.; Ma, G.; Chen, Q.; Zhang, C.; Balakin, A.V.; Shkurinov, A.P.; Zhu, Y.; Zhuang, S.

Авторы: Zuanming Jin, Peng Yan, Fang Yuqing, Ye Zhijiang, Fan Zhiyuan, Liu Zhilin, Bao Xichang, Gao Heng, Ren Wei, Wu Jing, Ma Guohong, Chen Qianli, Zhang Chao, Balakin Alexey V., Shkurinov Alexander P., Zhu Yiming, Zhuang Songlin
Журнал: LIGHT-SCIENCE & APPLICATIONS
Том: 11
Номер: 1
Год издания: 2022
DOI: 10.1038/s41377-022-00872-y
Аннотация: Organic-inorganic hybrid metal halide perovskites (MHPs) have attracted tremendous attention for optoelectronic applications. The long photocarrier lifetime and moderate carrier mobility have been proposed as results of the large polaron formation in MHPs. However, it is challenging to measure the effective mass and carrier scattering parameters of the photogenerated large polarons in the ultrafast carrier recombination dynamics. Here, we show, in a one-step spectroscopic method, that the optical-pump and terahertz-electromagnetic probe (OPTP) technique allows us to access the nature of interplay of photoexcited unbound charge carriers and optical phonons in polycrystalline CH3 NH3 PbI 3 (MAPbI3 ) of about 10 μm grain size. Firstly, we demonstrate a direct spectral evidence of the large polarons in polycrystalline MAPbI3 . Using the Drude–Smith–Lorentz model along with the Frӧhlich-type electronphonon (e-ph) coupling, we determine the effective mass and scattering parameters of photogenerated polaronic carriers. We discover that the resulting moderate polaronic carrier mobility is mainly inﬂuenced by the enhanced carrier scattering, rather than the polaron mass enhancement. While, the formation of large polarons in MAPbI3 polycrystalline grains results in a long charge carrier lifetime at room temperature. Our results provide crucial information about the photo-physics of MAPbI 3 and are indispensable for optoelectronic device development with better performance.
Добавил в систему: Шкуринов Александр Павлович

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Photoinduced large polaron transport and dynamics in organic–inorganic hybrid lead halide perovskite with terahertz probesстатья

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