Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

Xiaofan Deng; Xiaoming Wen; Rui Sheng; Shujuan Huang; Takaaki Harada; Tak W. Kee; Martin A. Green; Anita Ho-Baillie

doi:10.1117/12.2202330

22 December 2015 Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites

Xiaofan Deng, Xiaoming Wen, Rui Sheng, Shujuan Huang, Takaaki Harada, Tak W. Kee, Martin A. Green, Anita Ho-Baillie

Proceedings Volume 9668, Micro+Nano Materials, Devices, and Systems; 966848 (2015) https://doi.org/10.1117/12.2202330
Event: SPIE Micro+Nano Materials, Devices, and Applications, 2015, Sydney, New South Wales, Australia

Abstract

Methylammonium Lead Bromide (CH₃NH₃PbBr₃) is a promising material for tandem solar cell due to its high band gap. Ultrafast optical techniques on a time scale of femto- and picosecond are used to investigate the carrier dynamics in CH₃NH₃PbBr₃. An ultrafast cooling of hot carriers occurs in sub-picoseconds in CH₃NH₃PbBr₃ by phonon scattering. Two ultrafast relaxation processes are attributed to optical phonon scattering and acoustic phonon scattering. The relaxation processes are evidently slower when CH₃NH₃PbBr₃ is in contact with compact TiO₂ (c-TiO₂) layer, suggesting better quality CH₃NH₃PbBr₃. when deposited on c-TiO₂. The nanosecond decay in CH₃NH₃PbBr₃ film is ascribed to electron-hole recombination. With the presence of c-TiO₂ layer, this process is accelerated due to electron transport across the CH₃NH₃PbBr₃/ c-TiO₂ interface.

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Xiaofan Deng, Xiaoming Wen, Rui Sheng, Shujuan Huang, Takaaki Harada, Tak W. Kee, Martin A. Green, and Anita Ho-Baillie "Ultrafast charge generation and relaxation dynamics in methylammonium lead bromide perovskites", Proc. SPIE 9668, Micro+Nano Materials, Devices, and Systems, 966848 (22 December 2015); https://doi.org/10.1117/12.2202330

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