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

被引：343

作者：

Yang, Ye ^{[1
]}

Yang, Mengjin ^{[1
]}

Li, Zhen ^{[1
]}

Crisp, Ryan ^{[1
]}

Zhu, Kai ^{[1
]}

Beard, Matthew C. ^{[1
]}

机构：

[1] Natl Renewable Energy Lab, Chem & Nanosci Ctr, Golden, CO 80401 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2015年 / 6卷 / 23期

关键词：

ORGANOMETAL HALIDE PEROVSKITES; LOW SURFACE RECOMBINATION; HYBRID SOLAR-CELLS; RADIATIVE RECOMBINATION; AUGER RECOMBINATION; SINGLE-CRYSTALS; CHARGE-CARRIERS; EFFICIENCY; PHOTODETECTORS; SEMICONDUCTORS;

D O I：

10.1021/acs.jpclett.5b02290

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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 similar to 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, similar to 40 meV, in CH3NH3PbBr3 compared with similar to 13 meV in CH3NH3PbI3.

引用

页码：4688 / 4692

页数：5

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