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

Wee Kiang Chong; Guichuan Xing; Yun Liu; Ee Ling Gui; Qing Zhang; Qihua Xiong; Nripan Mathews; Chee Kwan Gan; Tze Chien Sum

doi:10.1103/PhysRevB.90.035208

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

Wee Kiang Chong, Guichuan Xing, Yun Liu, Ee Ling Gui, Qing Zhang, Qihua Xiong, Nripan Mathews, Chee Kwan Gan^*, Tze Chien Sum

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb2S3) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates that the coherent B3g longitudinal optical phonon mode with a frequency of 63.74 ± 0.05 cm-1 (or 1.911 ± 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.

Original language	English
Article number	035208
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevB.90.035208
Publication status	Published - Jul 23 2014
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.90.035208

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abstract = "We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb2S3) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates that the coherent B3g longitudinal optical phonon mode with a frequency of 63.74 ± 0.05 cm-1 (or 1.911 ± 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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AU - Chong, Wee Kiang

AU - Xing, Guichuan

AU - Liu, Yun

AU - Gui, Ee Ling

AU - Zhang, Qing

AU - Xiong, Qihua

AU - Mathews, Nripan

AU - Gan, Chee Kwan

AU - Sum, Tze Chien

PY - 2014/7/23

Y1 - 2014/7/23

N2 - We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb2S3) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates that the coherent B3g longitudinal optical phonon mode with a frequency of 63.74 ± 0.05 cm-1 (or 1.911 ± 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.

AB - We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb2S3) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by extensive first-principles lattice dynamics calculations indicates that the coherent B3g longitudinal optical phonon mode with a frequency of 63.74 ± 0.05 cm-1 (or 1.911 ± 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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Direct measurement of coherent phonon dynamics in solution-processed stibnite thin films

Abstract

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