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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
Subject(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.
Issue Date:2021-06-24
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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