激子
半导体
凝聚态物理
格子(音乐)
材料科学
物理
光电子学
声学
作者
Eric R. Powers,Watcharaphol Paritmongkol,Dillon C. Yost,Woo Seok Lee,Jeffrey C. Grossman,William A. Tisdale
出处
期刊:Matter
[Elsevier]
日期:2024-04-01
卷期号:7 (4): 1612-1630
标识
DOI:10.1016/j.matt.2024.01.033
摘要
Summary
We reveal coherent exciton-phonon interactions in the two-dimensional (2D) layered hybrid organic-inorganic semiconductor silver phenylselenolate (AgSePh). Using femtosecond resonant impulsive vibrational spectroscopy and non-resonant Raman scattering, we identify multiple hybrid organic-inorganic vibrational modes that strongly couple to the excitonic transitions and characterize their behavior. Calculations by density functional perturbation theory show that these strongly coupled modes exhibit large out-of-plane silver atomic motions and silver-selenium spacing displacements. Moreover, analysis of photoluminescence spectral splitting and temperature-dependent peak shifting/linewidth broadening reveals that light emission in AgSePh is most strongly affected by a compound 100 cm−1 mode involving the wagging motion of phenylselenolate ligands and accompanying metal-chalcogen stretching. Finally, red shifting of vibrational modes with increasing temperature reveals a high degree of anharmonicity arising from non-covalent interactions between phenyl rings. These findings reveal the unique effects of hybrid vibrational modes in organic-inorganic semiconductors and motivate future work aimed at specifically engineering such interactions through chemical and structural modification.
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