Carrier–phonon interaction and anharmonic phonon decay in ZnS thin film studied by resonance Raman scattering

IF 2.4 3区 化学 Q2 SPECTROSCOPY
Manzar Mushaf Yaqoob, Muhammad Faisal Iqbal, Deliang Wang
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Abstract

Resonance Raman scattering was carried out on polycrystalline zinc sulfide (ZnS) thin film. The resonance Raman spectra revealed strong carrier–phonon interaction where longitudinal optical phonon (LO) with overtones up to the fourth order and its combination phonons with transverse acoustic (TA) phonons were observed, namely, nLO + mTA (where n and m are integers). The resonance Raman scattering processes were well explained within the framework of the cascade scattering model. The wavenumber of the LO phonon with increased temperature was dominated by anharmonic phonon decay. Detailed experimental data fittings showed that thermal expansion contribution to the nLO phonon overtones differed from the fundamental LO phonon due to the involvement of the scattering of the LO phonons at the Brillion zone edge. The negative value of the mode-Grüneisen parameter for the TA phonon slowed down the wavenumber shift of the combination nLO + mTA phonon modes with increasing temperature compared to the nLO phonons. The anharmonic phonon decay of combination nLO + mTA phonons were dominated by anharmonic phonon decay of nLO phonons.

Abstract Image

用共振拉曼散射研究了ZnS薄膜中载流子-声子相互作用和非谐波声子衰变
在多晶硫化锌(ZnS)薄膜上进行了共振拉曼散射。共振拉曼光谱显示出较强的载流子-声子相互作用,其中具有四阶泛音的纵向光学声子(LO)及其与横向声学声子(TA)的组合声子,即nLO + mTA(其中n和m为整数)。在级联散射模型的框架内很好地解释了共振拉曼散射过程。随着温度的升高,LO声子的波数以非谐波声子衰变为主。详细的实验数据拟合表明,热膨胀对nLO声子泛音的贡献与基本LO声子不同,这是由于LO声子在brilion区边缘的散射。与nLO声子相比,TA声子的模格 neisen参数为负值时,nLO + mTA声子组合模式的波数位移随温度的升高而减慢。nLO + mTA组合声子的非调和声子衰变以nLO声子的非调和声子衰变为主。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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