Role of Dielectric Drag in Polaron Mobility in Lead Halide Perovskites,ACS Energy Letters

当前位置： X-MOL 学术 › ACS Energy Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Role of Dielectric Drag in Polaron Mobility in Lead Halide Perovskites
ACS Energy Letters ( IF 19.3 ) Pub Date : 2017-10-17 00:00:00 , DOI: 10.1021/acsenergylett.7b00717
Mischa Bonn ₁ , Kiyoshi Miyata ₂ , Euan Hendry ₃ , X.-Y. Zhu ₂

Affiliation

Hybrid organic–inorganic lead halide perovskites (HOIPs) have attracted much attention because of their remarkable carrier lifetimes and diffusion lengths. These properties have been attributed to the efficient screening of charge carriers via polaron formation in the highly polar and dynamic environment. Polaron formation explains, at least in part, the moderate charge carrier mobility, but the calculated mobilities are somewhat higher than experimental values. Here we discuss a factor that has been previously overlooked and can potentially account for the discrapency: the effect of dielectric drag. While optical phonon modes of the lead halide sublattice are mainly responsible for polaron formation, slower orientational relaxation of surrounding dipoles adds a dielectric drag to the moving charge. We discuss the role of this dielectric drag based on the measured dielectric function in the gigahertz to terahertz frequency range and how we can understand the unique carrier physics in HOIPs in view of its crystal–liquid duality.

中文翻译：

介电阻力在卤化钙钛矿中极化子迁移中的作用

杂化有机-无机卤化铅钙钛矿（HOIPs）因其卓越的载流子寿命和扩散长度而备受关注。这些性质归因于在高极性和动态环境中通过极化子形成对载流子的有效筛选。极化子的形成至少部分解释了中等程度的电荷载流子迁移率，但计算得出的迁移率略高于实验值。在这里，我们讨论一个以前被忽略的因素，它有可能解释这种差异：介电阻力的影响。卤化铅亚晶格的光学声子模主要负责极化子的形成，而周围偶极子的较慢的取向弛豫则增加了移动电荷的介电阻力。

更新日期：2017-10-17

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11