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Temperature dependence of Raman scattering in 4H-SiC

机译:4H-SiC中拉曼散射的温度依赖性

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摘要

A series of 4H-SiC bulk wafers with different carrier concentrations were studied by Raman scattering in temperature range of 80K to 873K. Different Raman phonon modes of 4H-SiC can be clearly observed. Most Raman peaks of different modes shift to lower frequency with increasing temperature. But abnormal behavior can be observed in the longitudinal optical-plasma coupling mode, which does not decrease in frequency monotonously when temperature increases like other Raman modes. It increases at relatively low temperature and begins to drop after a critical temperature.
机译:通过在80K到873K的温度范围内进行拉曼散射研究了一系列具有不同载流子浓度的4H-SiC体晶片。可以清楚地观察到4H-SiC的不同拉曼声子模式。随着温度升高,大多数不同模式的拉曼峰移至较低频率。但是可以在纵向光-等离子体耦合模式中观察到异常行为,当温度升高时,这种行为不会像其他拉曼模式那样单调降低频率。它在相对较低的温度下增加,并在临界温度后开始下降。

著录项

  • 来源
  • 会议地点 St. Petersburg(RU)
  • 作者单位

    State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;

    Institute of Photonics and Optoelectronics, Department of Electrical Engineering, and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, 106-17 Taiwan;

    State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;

    Institute of Photonics and Optoelectronics, Department of Electrical Engineering, and Center for Emerging Material and Advanced Devices, National Taiwan University, Taipei, 106-17 Taiwan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    4H-SiC; Raman scattering; temperature dependence; longitudinal optical-plasma coupling (LOPC);

    机译:4H-SiC;拉曼散射温度依赖性纵向光等离子体耦合(LOPC);

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