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.

中文翻译：

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通过共振拉曼散射研究 ZnS 薄膜中的载流子-声子相互作用和非谐波声子衰变

对多晶硫化锌（ZnS）薄膜进行共振拉曼散射。共振拉曼光谱揭示了强烈的载流子-声子相互作用，其中观察到泛音高达四阶的纵向光学声子（LO）及其与横向声学（TA）声子的组合声子，即nLO + mTA（其中n和m是整数） ）。共振拉曼散射过程在级联散射模型的框架内得到了很好的解释。随着温度升高，LO 声子的波数主要由非简谐声子衰变决定。详细的实验数据拟合表明，由于涉及十亿区边缘处 LO 声子的散射，热膨胀对 nLO 声子泛音的贡献与基本 LO 声子不同。与 nLO 声子相比，TA 声子的模式-Grüneisen 参数为负值，随着温度的升高，nLO + mTA 声子模式组合的波数漂移减慢。nLO + mTA 声子组合的非简谐声子衰变以 nLO 声子的非简谐声子衰变为主。