Comparison of Recombination Dynamics in CH3NH3PbBr3 and CH3NH3PbI3 Perovskite Films: Influence of Exciton Binding Energy

Ye Yang, Mengjin Yang, Zhen Li, Ryan Crisp, Kai Zhu, Matthew C. Beard

科研成果: 期刊稿件文章同行评审

373 引用 (Scopus)

摘要

Understanding carrier recombination in semiconductors is a critical component when developing practical applications. Here we measure and compare the monomolecular, bimolecular, and trimolecular (Auger) recombination rate constants of CH3NH3PbBr3 and CH3NH3PbI3. The monomolecular and bimolecular recombination rate constants for both samples are limited by trap-assisted recombination. The bimolecular recombination rate constant for CH3NH3PbBr3 is 3.3 times larger than that for CH3NH3PbI3 and both are in line with that found for radiative recombination in other direct-gap semiconductors. The Auger recombination rate constant is 4 times larger in lead-bromide-based perovskite compared with lead-iodide-based perovskite and does not follow the reduced Auger rate when the bandgap increases. The increased Auger recombination rate, which is enhanced by Coulomb interactions, can be ascribed to the larger exciton binding energy, ≈40 meV, in CH3NH3PbBr3 compared with ≈13 meV in CH3NH3PbI3.

源语言英语
页(从-至)4688-4692
页数5
期刊Journal of Physical Chemistry Letters
6
23
DOI
出版状态已出版 - 3 12月 2015
已对外发布

指纹

探究 'Comparison of Recombination Dynamics in CH3NH3PbBr3 and CH3NH3PbI3 Perovskite Films: Influence of Exciton Binding Energy' 的科研主题。它们共同构成独一无二的指纹。

引用此