Twist-to-Untwist Evolution and Cation Polarization Behavior of Hybrid Halide Perovskite Nanoplatelets Revealed by Cryogenic Transmission Electron Microscopy

Zhu, Yuanmin1,2; Wang, Shixun3,4; Li, Bai1; Yang, Xuming1; Wu, Duojie1; Feng, Shihui1; Li, Lei1; Rogach, Andrey L.3,4; Gu, Meng1

2021-12-01

10.1021/acs.jpclett.1c03570

Journal of Physical Chemistry Letters   影响因子和分区

1948-7185

Hybrid methylammonium lead iodide (MAPbI(3)) perovskite nanoplatelets (NPLs) have emerged as promising optoelectronic materials because of their remarkable properties in defect tolerance, band gap tunability, and light emission. However, the detailed formation mechanism, in particular the atomic structure information in the initial nucleation stage, stands as a mystery because of the intrinsic vulnerability toward moisture, electron beams, etc. By virtue of the imaging technique under the extremely low electron dose of the cryogenic TEM, atomic structures of MAPbI(3) NPLs are imaged, and a twist-to-untwist structural evolution is captured. According to theoretical calculation results, the twist-to untwist evolution is a spontaneous process, and the band gap will be reduced, which is further verified by the red shift of photoluminescence peaks with aging time. Moreover, MA cation polarization is observed by quantitative analysis of the atomic-resolution image of single crystalline MAPbI(3) NPLs, which demonstrates the high ion mobility in the lattice of the hybrid halide perovskites.

SCI ; EI

英语

NI期刊

第一 ; 通讯

National Natural Science Foundation of China[12004156] ; Shenzhen Basic Research Fund[JCYJ20190809181601639] ; Research Grant Council of Hong Kong[C7035-20G]

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

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Atomic, Molecular & Chemical

WOS:000734281900001

AMER CHEMICAL SOC

20220111411206

Atoms ; Cryogenics ; High resolution transmission electron microscopy ; Hybrid materials ; Iodine compounds ; Layered semiconductors ; Lead compounds ; Optoelectronic devices ; Perovskite ; Polarization ; Positive ions

Minerals:482.2 ; Cryogenics:644.4 ; Semiconducting Materials:712.1 ; Optical Devices and Systems:741.3 ; Atomic and Molecular Physics:931.3

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Dongguan Univ Technol, Sch Mat Sci & Engn, Dongguan 523808, Peoples R China
3.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
4.City Univ Hong Kong, Ctr Funct Photon CFP, Hong Kong, Peoples R China

Zhu, Yuanmin,Wang, Shixun,Li, Bai,et al. Twist-to-Untwist Evolution and Cation Polarization Behavior of Hybrid Halide Perovskite Nanoplatelets Revealed by Cryogenic Transmission Electron Microscopy[J]. Journal of Physical Chemistry Letters,2021,12(51):12187-12195.

Zhu, Yuanmin.,Wang, Shixun.,Li, Bai.,Yang, Xuming.,Wu, Duojie.,...&Gu, Meng.(2021).Twist-to-Untwist Evolution and Cation Polarization Behavior of Hybrid Halide Perovskite Nanoplatelets Revealed by Cryogenic Transmission Electron Microscopy.Journal of Physical Chemistry Letters,12(51),12187-12195.

Zhu, Yuanmin,et al."Twist-to-Untwist Evolution and Cation Polarization Behavior of Hybrid Halide Perovskite Nanoplatelets Revealed by Cryogenic Transmission Electron Microscopy".Journal of Physical Chemistry Letters 12.51(2021):12187-12195.