极化子
凝聚态物理
材料科学
有效质量(弹簧-质量系统)
载流子
钙钛矿(结构)
声子
电子迁移率
格子(音乐)
电荷密度
化学物理
电子
物理
化学
量子力学
结晶学
声学
作者
Lei Gao,Heng Zhang,Yong Zhang,Shuai Fu,Jaco J. Geuchies,Donato Valli,Rafikul Ali Saha,Bapi Pradhan,Maarten B. J. Roeffaers,Elke Debroye,Johan Hofkens,Junpeng Lü,Zhenhua Ni,Hai I. Wang,Mischa Bonn
标识
DOI:10.1002/adma.202406109
摘要
Abstract Charge carriers in the soft and polar perovskite lattice form so‐called polaron quasiparticles, charge carriers dressed with a lattice deformation. The spatial extent of a polaron is governed by the material's electron‐phonon interaction strength, which determines charge carrier effective mass, mobility, and the so‐called Mott polaron density, that is, the maximum stable density of charge carriers that a perovskite can support. Despite its significance, controlling polaron dimensions has been challenging. Here, experimental substantial tuning of polaron dimensions is reported by lattice engineering, through Pb/Sn substitution in CH 3 NH 3 Sn x Pb 1−x I 3 . The polaron dimension is deduced from the Mott polaron density, which can be composition‐tuned over an order of magnitude, while charge carrier mobility occurs through band transport, and remains substantial across all compositions, ranging from 10 s to 100 s cm 2 V s −1 at room temperature. The effective modulation of polaron size can be understood by considering the bond asymmetry after carrier injection as well as the random spatial distribution of Pb/Sn ions. This study underscores the potential for tailoring polaron dimensions, which is crucial for optimizing applications prioritizing either high charge carrier density or high mobility.
科研通智能强力驱动
Strongly Powered by AbleSci AI