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

Article

关键词: DISPLACIVE EXCITATION;    SB2S3;    MECHANISM;    CRYSTALS;    SB;   

DOI  :  10.1103/PhysRevB.90.035208

来源: SCIE

【 摘 要 】

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 B-3g 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.

【 授权许可】

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