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research article

Band Gap Renormalization at Different Symmetry Points in Perovskites

Wang, Lijie  
•
Nughays, Razan
•
Yin, Jun
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May 17, 2024
Acs Photonics

Using ultrafast broad-band transient absorption (TA) spectroscopy of photoexcited MAPbBr3 thin films with probe continua in the visible and the mid- to deep-ultraviolet (UV) ranges, we capture the ultrafast renormalization at the fundamental gap at the R symmetry point of the Brillouin zone (BZ) and a higher energy gap at the M symmetry point. Advanced global lifetime analysis and lifetime density distribution analysis are applied to extract quantitative information. Our work confirms the similarity of the response at both high-symmetry points, which indicates a band edge renormalization that rises within the instrument response function (IRF, similar to 250 fs) and decays in ca. 400-600 fs, undergoing an energy red shift of 90-150 meV. The reported time scale corresponds to the decay of free carriers into neutral excitons. The ability to monitor different high-symmetry points in photoexcited perovskites opens exciting prospects for the characterization of a large class of materials and for photonic applications.

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Type
research article
DOI
10.1021/acsphotonics.4c00082
Web of Science ID

WOS:001227310700001

Author(s)
Wang, Lijie  
Nughays, Razan
Yin, Jun
Shih, Chun-Hua
Guo, Tzung-Fang
Mohammed, Omar F.
Chergui, Majed  
Date Issued

2024-05-17

Publisher

Amer Chemical Soc

Published in
Acs Photonics
Subjects

Technology

•

Physical Sciences

•

Broad-Band Uv Transient Absorption

•

Ultrafast Spectralresponse

•

Photoexcitation

•

Global Lifetime Analysis

•

Many-Body Interactions

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSU  
FunderGrant Number

Horizon 2020 Framework Programme

695197

European Research Council

Swiss NSF via the NCCR:MUST

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Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208416
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