UNDERSTANDING CARRIER AND ELEMENT SPECIFIC DYNAMICS IN ORGANOHALIDE PEROVSKITE BY FEMTOSECOND TABLETOP XUV SPECTROSCOPY

Sharma, Aastha

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https://hdl.handle.net/2142/104502 Copy

Description

Title

UNDERSTANDING CARRIER AND ELEMENT SPECIFIC DYNAMICS IN ORGANOHALIDE PEROVSKITE BY FEMTOSECOND TABLETOP XUV SPECTROSCOPY

Author(s)

Sharma, Aastha

Contributor(s)

Vura-Weis, Josh ; Verkamp, Max A

Issue Date

2019-06-18

Keyword(s)

Mini-symposium: High-Harmonic Generation and XUV Spectroscopy

Abstract

Hybrid organic-inorganic halide perovskites, such as methylammonium lead iodide have emerged as outstanding light absorbing and emitting materials in recent years. Quasi-2D/layered perovskites have also gained significant attention owing to enhanced ambient stability, high luminescence quantum yield and strong excitonic effects. However, our current understanding of the fundamental photophysics in these materials is limited by the overlap of spectral features in the energy ranges studied using traditional methods of time-resolved spectroscopy. Ultrafast extreme ultraviolet (XUV) absorption was used to investigate electron and hole dynamics in perovskites by observing transitions from core level (I 4d and Br 3d ) to the valence and conduction bands. Using a table-top instrument, ultrashort (30 fs) pulses of XUV radiation with a broad spectrum (40-75 eV) were generated via high-harmonic generation. Transient absorption measurements using visible pump and XUV probe directly observed carrier and element specific relaxation dynamics in mixed-halide and layered perovskites for above band edge excitation in the femtosecond and picosecond time scales.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/104502

DOI

10.15278/isms.2019.TK02

Copyright and License Information

Copyright 2019 Aastha Sharma

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