Quasi-Type II Core-Shell Perovskite Nanocrystals for Improved Structural Stability and Optical Gain

Zhang，Xuanyu1; Guo，Zhihang2; Li，Ruxue1,3; Yu，Jiahao1; Yuan，Baozhen1; Chen，Baian1,4; He，Tingchao2; Chen，Rui1

2021

10.1021/acsami.1c18025

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

In recent years, core-shell lead halide perovskite nanocrystals (PeNCs) and their devices have attracted intensive attention owing to nearly perfect optoelectronic properties. However, the complex photophysical mechanism among them is still unclear. Herein, monodispersed core-shell PeNCs coated with an all-inorganic cesium lead bromide (CsPbBr3) shell epitaxially grown on the surface of formamidinium lead bromide (FAPbBr3) PeNCs were synthesized. Through power- and temperature-dependent photoluminescence (PL) measurements, it is found that the electronic structure of the core-shell FAPbBr3/CsPbBr3 PeNCs has a quasi-type II band alignment. The presence of Cs+ in the shell limits ion migration and helps to stabilize structural and optical properties. On this basis, after being exposed to pulsed nanosecond laser for a period, an amplified spontaneous emission (ASE) can be observed, which is attributed to the effective passivation induced by laser irradiation on defects at the interface. The ASE threshold of the core-shell PeNCs showing high structural and optical stability is 447 nJ/cm2 under pulsed nanosecond optical pumping. The results that are demonstrated here provide a new idea and perspective for improving the stability of perovskite and can be of practical interest for the utilization of the core-shell PeNCs in optoelectronic devices.

amplified spontaneous emission core-shell perovskite nanocrystals laser spectroscopy photostability quasi-type II band alignment

EI ; SCI

英语

第一 ; 通讯

National Natural Science Foundation of China[62174079,62104052] ; Shenzhen Science and Technology Innovation Commission (P r o j e c t s N o s.)["JCYJ20210324120204011","KQTD2015071710313656"] ; Natural Science Foundation of Guangxi Province[2021JJB170012] ; Scientific Research Foundation of Guangxi Education Department[2021KY0345] ; Scientific Research Starting Foundation of Guangxi University of Science and Technology[21Z03]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000752970600137

AMER CHEMICAL SOC

20214911290690

Bromine compounds ; Cesium compounds ; Electronic structure ; Lead compounds ; Optical properties ; Optical pumping ; Optoelectronic devices ; Perovskite ; Pulsed lasers ; Shells (structures) ; Stability

Structural Members and Shapes:408.2 ; Minerals:482.2 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Lasers, General:744.1 ; Nanotechnology:761 ; Crystalline Solids:933.1

2-s2.0-85120617205

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,518060,China
3.School of Electrical and Information Engineering,Guangxi University of Science and Technology,Liuzhou,545006,China
4.Department of Applied Biology and Chemical Technology,Hong Kong Polytechnic University,Hung Hom,Kowloon,999077,Hong Kong

Zhang，Xuanyu,Guo，Zhihang,Li，Ruxue,et al. Quasi-Type II Core-Shell Perovskite Nanocrystals for Improved Structural Stability and Optical Gain[J]. ACS Applied Materials & Interfaces,2021,13(48):58170-58178.

Zhang，Xuanyu.,Guo，Zhihang.,Li，Ruxue.,Yu，Jiahao.,Yuan，Baozhen.,...&Chen，Rui.(2021).Quasi-Type II Core-Shell Perovskite Nanocrystals for Improved Structural Stability and Optical Gain.ACS Applied Materials & Interfaces,13(48),58170-58178.

Zhang，Xuanyu,et al."Quasi-Type II Core-Shell Perovskite Nanocrystals for Improved Structural Stability and Optical Gain".ACS Applied Materials & Interfaces 13.48(2021):58170-58178.