Direct measurement of coherent phonon dynamics in solution-processed stibnite thin films

We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb sub(2)S sub(3)) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates th...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-07, Vol.90 (3), Article 035208
Main Authors: Chong, Wee Kiang, Xing, Guichuan, Liu, Yun, Gui, Ee Ling, Zhang, Qing, Xiong, Qihua, Mathews, Nripan, Gan, Chee Kwan, Sum, Tze Chien
Format: Article
Language:English
Subjects:
Channels
Coherence
Condensed matter
Dynamics
Oscillations
Phonons
Stibnite
Thin films
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container_title Physical review. B, Condensed matter and materials physics
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description We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb sub(2)S sub(3)) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates that the coherent B sub(3)g longitudinal optical phonon mode with a frequency of 63.74 + or - 0.05 cm super(-1) (or 1.911 + or - 0.002 THz) at room temperature is generated via the impulsive stimulated-Raman-scattering mechanism. These strong electron-phonon interactions indicate a dominant energy-loss channel in these materials that could impose a fundamental limit on their solar energy conversion efficiency.
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subjects Channels
Coherence
Condensed matter
Dynamics
Oscillations
Phonons
Stibnite
Thin films
title Direct measurement of coherent phonon dynamics in solution-processed stibnite thin films
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