【摘要】 报道了采用物理汽相输运（PVT）淀积工艺生长的多种组分的多晶ZnS_xSe_1-x材料及其晶格振动行为的远红外光谱。给出其光学声子双模行为的明确证据和双声子吸收随温度的变化规律,并讨论了它们的起因。用赝谐振子模型对实验反射谱拟合计算得到混晶光学声子特征参数及高频介电常数。更多还原

【Abstract】 The polycrystalline ZnS_xSe_1-x with various compositions grown by physical vapor transport （PVT） technique are reported and their phonon behaviors are investigated by means of FT-IR spectroscopy. The two-phonon behavior for the optical phonon of the mixed crystal is confirmed and two-phonon absorption processes and their temperature dependence are observed and discussed. Moreover, a pseudo-oscillator model is adopted for fitting the experimental reflection spectra to extract the parameters of the optical phonons and the dielectric constant at optical frequencies for the mixed orystal ZnS_xSe_1-x.更多还原