Hot Polarons with Trapped Excitons and Octahedra-Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires

被引：10

作者：

Song, Feilong ^{[1
,2
,3
]}

Qian, Chenjiang ^{[1
,2
,3
]}

Wang, Yunuan ^{[1
,4
]}

Zhang, Feng ^{[5
]}

Peng, Kai ^{[1
,2
,3
]}

Wu, Shiyao ^{[1
,2
,3
]}

Xie, Xin ^{[1
,2
,3
]}

Yang, Jingnan ^{[1
,2
,3
]}

Sun, Sibai ^{[1
,2
,3
]}

Yu, Yang ^{[1
,2
,3
]}

Dang, Jianchen ^{[1
,2
,3
]}

Xiao, Shan ^{[1
,2
,3
]}

Yang, Longlong ^{[1
,2
,3
]}

Jin, Kuijuan ^{[1
,2
,3
,6
]}

Zhong, Haizheng ^{[5
]}

Xu, Xiulai ^{[1
,2
,3
,6
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100049, Peoples R China

[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[4] Beijing Jiaotong Univ, Minist Educ, Key Lab Luminescence & Opt Informat, Beijing 100044, Peoples R China

[5] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Nanophoton & Ultrafine Optoelect, Beijing 100081, Peoples R China

[6] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

来源：

LASER & PHOTONICS REVIEWS | 2020年 / 14卷 / 01期

基金：

中国国家自然科学基金;

关键词：

exciton-phonon interaction; hot polarons; hybrid perovskite; trapped excitons; LEAD HALIDE PEROVSKITES; QUANTUM DOTS; ELECTRON; NANOCRYSTALS; CARRIER; LUMINESCENT; TRANSPORT; LASERS; BR;

D O I：

10.1002/lpor.201900267

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Hybrid Perovskites have shown a great potential for applications in photovoltaics and light-emitting devices with high efficiency. Interaction between defect-induced trapped excitons and phonons plays an important role in understanding the emerging phenomena for such an excellent figure-of-merit. Here hot polarons with narrow linewidth in CH3NH3PbBr3 nanowires, which originate from the interaction between trapped excitons and octahedra-twist phonons, are demonstrated. The observation of hot polarons in photoluminescence without gain methods indicates the large interaction strength between excitons and phonons. The multiple hot polarons are further confirmed by magneto-optical spectra with a Zeeman splitting of the trapped excitons and a phonon energy increase with diamagnetic effect. Furthermore, the phonons participating in the interaction are demonstrated to be the octahedra-twist vibrations which are transverse optical phonons, while the interaction between trapped excitons and longitudinal optical phonons is weak. The work demonstrates that trapped excitons in perovskites prefer to interact with transverse rather than longitudinal optical phonons. Since bulk materials usually interact with longitudinal optical phonons, this result provides a physical explanation of the high tolerance of defects in perovskites.

引用

页数：7

共 61 条

[21] The Mechanism of Slow Hot-Hole Cooling in Lead-Iodide Perovskite: First-Principles Calculation on Carrier Lifetime from Electron-Phonon Interaction [J].