Electronic structure and effective mass of pristine and Cl-doped CsPbBr_(3)  

作　　者：魏志远 魏愉昊 徐申东 彭舒婷 Makoto Hashimoto 路东辉 潘旭 匡泯泉 肖正国 何俊峰 Zhiyuan Wei;Yu-Hao Wei;Shendong Xu;Shuting Peng;Makoto Hashimoto;Donghui Lu;Xu Pan;Min-Quan Kuang;Zhengguo Xiao;Junfeng He(Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China;Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics,and School of Physical Science and Technology,Southwest University,Chongqing 400715,China;Key Laboratory of Photovoltaic and Energy Conservation Materials,Institute of Applied Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Stanford Synchrotron Radiation Lightsource and Stanford Institute for Materials and Energy Sciences,SLAC National Accelerator Laboratory,Menlo Park,California 94025,USA)

机构地区：[1]Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China [2]Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics,and School of Physical Science and Technology,Southwest University,Chongqing 400715,China [3]Key Laboratory of Photovoltaic and Energy Conservation Materials,Institute of Applied Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [4]Stanford Synchrotron Radiation Lightsource and Stanford Institute for Materials and Energy Sciences,SLAC National Accelerator Laboratory,Menlo Park,California 94025,USA

出　　处：《Chinese Physics B》2024年第5期167-171,共5页中国物理B（英文版）

基　　金：Project supported by the International Partnership Program of the Chinese Academy of Sciences(Grant No.123GJHZ2022035MI);the Fundamental Research Funds for the Central Universities(Grant Nos.WK3510000015 and WK3510000012)。

摘　　要：Organic–inorganic lead halide perovskites(LHPs) have attracted great interest owing to their outstanding optoelectronic properties.Typically,the underlying electronic structure would determinate the physical properties of materials.But as for now,limited studies have been done to reveal the underlying electronic structure of this material system,comparing to the huge amount of investigations on the material synthesis.The effective mass of the valance band is one of the most important physical parameters which plays a dominant role in charge transport and photovoltaic phenomena.In pristine CsPbBr_(3),the Fr?hlich polarons associated with the Pb–Br stretching modes are proposed to be responsible for the effective mass renormalization.In this regard,it would be very interesting to explore the electronic structure in doped LHPs.Here,we report high-resolution angle-resolved photoemission spectroscopy(ARPES) studies on both pristine and Cl-doped CsPbBr_(3).The experimental band dispersions are extracted from ARPES spectra along both ■ and ■ high symmetry directions.DFT calculations are performed and directly compared with the ARPES data.Our results have revealed the band structure of Cl-doped CsPbBr_(3) for the first time,which have also unveiled the effective mass renormalization in the Cl-doped CsPbBr_(3) compound.Doping dependent measurements indicate that the chlorine doping could moderately tune the renormalization strength.These results will help understand the physical properties of LHPs as a function of doping.

关 键 词：lead halide perovskites electronic structure effective mass 

分 类 号：O469[理学—凝聚态物理]