Ultrafast Carrier Specific Dynamics And Band Gap Renormalization In Ch₃nh₃pbbr₃ Understood By Femtosecond Tabletop Extreme Ultraviolet Spectroscopy

Sharma, Aastha

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https://hdl.handle.net/2142/111525 Copy

Description

Title

Ultrafast Carrier Specific Dynamics And Band Gap Renormalization In Ch₃nh₃pbbr₃ Understood By Femtosecond Tabletop Extreme Ultraviolet Spectroscopy

Author(s)

Sharma, Aastha

Contributor(s)

• Vura-Weis, Josh
• Schleife, André
• Verkamp, Max A
• Leveillee, Josh

Issue Date

2021-06-24

Keyword(s)

Dynamics and kinetics

Abstract

Hybrid organic-inorganic halide perovskites, such as CH$_{3}$NH$_{3}$PbBr$_{3}$ (MAPbBr$_{3}$) have emerged as outstanding light absorbing and emitting materials. MAPbBr$_{3}$ has a bandgap around 2.3 eV and a high open circuit voltage, making it suitable for tandem solar cell applications. However, detailed studies on photoexcited carrier dynamics of MAPbBr$_{3}$ are limited compared to its iodine counterpart. We show that tabletop high-harmonic extreme ultraviolet (XUV) transient absorption spectroscopy measures transition from Br 3d$_{5/2}$ and 3d$_{3/2}$ to the valence and conduction band of photoexcited MAPbBr$_{3}$ perovskite, enabling us to observe carrier specific dynamics. Taking advantage of a straightforward, simple parabolic model incorporating band filling and band gap renormalization, we also study the time evolution of the band gap renormalization effect. Our work highlights the application of femtosecond XUV spectroscopy for understanding non-equilibrium ultrafast photophysics of complex semiconductor materials by distinguishing competing processes: carrier cooling, band gap renormalization, band filling and recombination.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111525

DOI

10.15278/isms.2021.RJ10

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