首页|Electronic structure and effective mass of pristine and Cl-doped CsPbBr3

Electronic structure and effective mass of pristine and Cl-doped CsPbBr3

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Organic-inorganic lead halide perovskites(LHPs)have attracted great interest owing to their outstanding optoelec-tronic 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 CsPbBr3,the Fröhlich polarons associated with the Pb-Br stretching modes are proposed to be responsible for the effec-tive 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 CsPbBr3.The experimental band dispersions are extracted from ARPES spectra along both(Γ)-(M)-(Γ)and(X)-(M)-(X)high sym-metry directions.DFT calculations are performed and directly compared with the ARPES data.Our results have revealed the band structure of Cl-doped CsPbBr3 for the first time,which have also unveiled the effective mass renormalization in the Cl-doped CsPbBr3 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.

lead halide perovskiteselectronic structureeffective mass

魏志远、魏愉吴、徐申东、彭舒婷、Makoto Hashimoto、路东辉、潘旭、匡泯泉、肖正国、何俊峰

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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

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international partnership program of the Chinese Academy of Sciences中央高校基本科研业务费专项中央高校基本科研业务费专项

123GJHZ2022035MIWK3510000015WK3510000012

2024

10.1088/1674-1056/ad3c31

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(5)
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