Hot Polarons with Trapped Excitons and Octahedra‐Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires,Laser & Photonics Reviews

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Hot Polarons with Trapped Excitons and Octahedra‐Twist Phonons in CH3NH3PbBr3 Hybrid Perovskite Nanowires
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2019-11-17 , DOI: 10.1002/lpor.201900267
Feilong Song _{1,

2} , Chenjiang Qian _{1,

2} , Yunuan Wang _{1,

3} , Feng Zhang ₄ , Kai Peng _{1,

2} , Shiyao Wu _{1,

2} , Xin Xie _{1,

2} , Jingnan Yang _{1,

2} , Sibai Sun _{1,

2} , Yang Yu _{1,

2} , Jianchen Dang _{1,

2} , Shan Xiao _{1,

2} , Longlong Yang _{1,

2} , Kuijuan Jin _{1,

2,

5} , Haizheng Zhong ₄ , Xiulai Xu _{1,

2,

5}

Affiliation

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.

中文翻译：

CH3NH3PbBr3混合钙钛矿纳米线中的带陷子激子和八面体扭曲声子的热极化子

钙钛矿杂化材料显示出在光伏和发光设备中高效应用的巨大潜力。缺陷诱导的受激激子和声子之间的相互作用在理解如此优异的品质因数的新兴现象中起着重要作用。在这里，CH ₃ NH ₃ PbBr _3中的线宽较窄的热极化子展示了纳米线，这种纳米线源于捕获的激子和八面体扭曲声子之间的相互作用。没有增益方法的光致发光中热极化子的观察表明，激子与声子之间的相互作用强度很大。磁热光谱进一步证实了多个热极化子，其中捕获的激子发生了塞曼分裂，声子能量随抗磁效应而增加。此外，参与相互作用的声子被证明是八面体扭转振动，即横向光学声子，而捕获的激子与纵向光学声子之间的相互作用较弱。这项工作表明，钙钛矿中捕获的激子更喜欢与横向光学声子相互作用，而不是与纵向光学声子相互作用。

更新日期：2019-11-17

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