Recombination Dynamics Study on Nanostructured Perovskite Light-Emitting Devices

被引：122

作者：

Chen, Ziming ^{[1
]}

Li, Zhenchao ^{[1
]}

Zhang, Chongyang ^{[1
]}

Jiang, Xiao-Fang ^{[1
]}

Chen, Dongcheng ^{[1
]}

Xue, Qifan ^{[1
]}

Liu, Meiyue ^{[1
]}

Su, Shijian ^{[1
]}

Yip, Hin-Lap ^{[1
]}

Cao, Yong ^{[1
]}

机构：

[1] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Inst Polymer Optoelect Mat & Devices, Sch Mat Sci & Engn, 381 Wushan Rd, Guangzhou 510640, Guangdong, Peoples R China

来源：

ADVANCED MATERIALS | 2018年 / 30卷 / 38期

基金：

中国国家自然科学基金;

关键词：

crystal sizes; organic-inorganic hybrid perovskite LEDs; prediction; radiative efficiency; recombination dynamics; CHARGE-CARRIER DYNAMICS; METAL-HALIDE PEROVSKITES; AUGER RECOMBINATION; LAYERED-PEROVSKITE; HYBRID PEROVSKITE; QUANTUM DOTS; DIODES; ELECTROLUMINESCENCE; FILMS; SEMICONDUCTORS;

D O I：

10.1002/adma.201801370

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The field of organic-inorganic hybrid perovskite light-emitting diodes (PeLEDs) has developed rapidly in recent years. Although the performance of PeLEDs continues to improve through film quality control and device optimization, little research has been dedicated to understanding the recombination dynamics in perovskite thin films. Likewise, little has been done to investigate the effects of recombination dynamics on the overall light-emitting behavior of PeLEDs. Therefore, this study investigates the recombination dynamics of CH3NH3PbI3 thin films with differing crystal sizes by measurement of fluence-dependent transient absorption dynamics and time-resolved photoluminescence. The aim is to find out the link between recombination dynamics and device behavior in PeLEDs. It is found that bimolecular and Auger recombination become more efficient as the crystal size decreases and monomolecular recombination rate is affected by the trap density of perovskite. By defining the radiative efficiency Phi(n), which relates to the monomolecular, bimolecular, and Auger recombination, the fundamental recombination properties of CH3NH3PbI3 films are discerned in quantitative terms. These findings help us to understand the light emission behavior of PeLEDs. This study takes an important step toward establishing the relationship between film structure, recombination dynamics, and device behavior for PeLEDs, thereby providing useful insights toward the design of better perovskite devices.

引用

页数：9

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