Self-Structural Healing of Encapsulated Perovskite Microcrystals for Improved Optical and Thermal Stability

Li，Ruxue1,2,3; Li，Bobo4; Fang，Xuan2; Wang，Dengkui2; Shi，Yueqing1; Liu，Xiu1; Chen，Rui1; Wei，Zhipeng2

2021

10.1002/adma.202100466

ADVANCED MATERIALS   影响因子和分区

0935-9648

1521-4095

Perovskite materials and their optoelectronic devices have attracted intensive attentions in recent years. However, it is difficult to further improve the performance of perovskite devices due to the poor stability and the intrinsic deep level trap states (DLTS), which are caused by surface dangling bonds and grain boundaries. Herein, the CHNHPbBr perovskite microcrystal is encapsulated by a dense AlO layer to form a microenvironment. Through optical measurement, it is found that the structure of perovskite can be healed by itself even under high temperature and long-time laser illumination. The DLTS density decreases nearly an order of magnitude, which results in 4–14 times enhancement of light emission. The observation is ascribed to the micron-level environment, which serves as a self-sufficient high-vacuum growth chamber, where the components of the perovskite are completely retained when sublimated and the decomposed atoms can re-arrange after thermal treatment. The modified structure showing high thermal stability is able to maintain excellent optical and lasing stability up to 2 years. This discovery provides a new idea and perspective for improving the stability of perovskite and can be of practical interest for perovskite device application.

deep level trap states optical improvement perovskites self-structural healing stability

SCI ; EI

英语

NI期刊

第一 ; 通讯

National Natural Science Foundation of China[62074018,61674021,12074045,11674038,61704011,61904017] ; China Postdoctoral Science Foundation["2019M652176","2019M661680"] ; Developing Project of Science and Technology of Jilin Province["20200301052RQ","20180519017JH","20180520177JH"] ; Natural Science Foundation of Guangdong Province[2020A1515010868] ; Shenzhen Science and Technology Innovation Commission["JCYJ20180307151538972","JCYJ20180305180553701","KQTD2015071710313656"] ; Shenzhen post-doctoral research funding[25-K20257501]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000635144400001

WILEY-V C H VERLAG GMBH

20211410162882

Alumina ; Aluminum oxide ; Bromine compounds ; Dangling bonds ; Deep level transient spectroscopy ; Grain boundaries ; Lead compounds ; Microcrystals ; Nitrogen compounds ; Optical data processing ; Optoelectronic devices ; Stability ; Thermodynamic stability

Minerals:482.2 ; Thermodynamics:641.1 ; Data Processing and Image Processing:723.2 ; Optical Devices and Systems:741.3 ; Physical Chemistry:801.4 ; Inorganic Compounds:804.2 ; Crystalline Solids:933.1

MATERIALS SCIENCE

2-s2.0-85103430748

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.State Key Laboratory of High Power Semiconductor Lasers,School of Science,Changchun University of Science and Technology,Changchun,130022,China
3.School of Electrical and Information Engineering,Guangxi University of Science and Technology,Liuzhou,545006,China
4.College of New Materials and New Energies,Shenzhen Technology University,Shenzhen,518118,China

Li，Ruxue,Li，Bobo,Fang，Xuan,et al. Self-Structural Healing of Encapsulated Perovskite Microcrystals for Improved Optical and Thermal Stability[J]. ADVANCED MATERIALS,2021,33.

Li，Ruxue.,Li，Bobo.,Fang，Xuan.,Wang，Dengkui.,Shi，Yueqing.,...&Wei，Zhipeng.(2021).Self-Structural Healing of Encapsulated Perovskite Microcrystals for Improved Optical and Thermal Stability.ADVANCED MATERIALS,33.

Li，Ruxue,et al."Self-Structural Healing of Encapsulated Perovskite Microcrystals for Improved Optical and Thermal Stability".ADVANCED MATERIALS 33(2021).