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Recombination Dynamics Study on Nanostructured Perovskite Light‐Emitting Devices
Author(s) -
Chen Ziming,
Li Zhenchao,
Zhang Chongyang,
Jiang XiaoFang,
Chen Dongcheng,
Xue Qifan,
Liu Meiyue,
Su Shijian,
Yip HinLap,
Cao Yong
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201801370
Subject(s) - auger effect , materials science , perovskite (structure) , photoluminescence , recombination , chemical physics , spontaneous emission , light emitting diode , optoelectronics , ultrafast laser spectroscopy , auger , optics , physics , atomic physics , chemistry , crystallography , laser , biochemistry , gene
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 CH 3 NH 3 PbI 3 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 Φ( n ), which relates to the monomolecular, bimolecular, and Auger recombination, the fundamental recombination properties of CH 3 NH 3 PbI 3 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.