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Improved GaN-on-Si epitaxial quality by incorporating various Si_xN_y interlayer structures

机译:通过合并各种Si_xN_y中间层结构来改善GaN-on-Si外延质量

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摘要

In this study, 1.61-μm-thick GaN/graded AlGaN/AlN epilayers were prepared on Si substrates by using metalorganic chemical vapor deposition. To determine whether the insertion of a Si_xN_y interlayer enhances the epitaxial quality of the GaN layer, various numbers of Si_xN_y, interlayers were inserted at different locations, and the effects were investigated. In addition to analyzing crystal quality, epilayer stress was investigated in detail by performing Raman, photoluminescence, and curvature measurements. Inserting Si_xN_y into the AlGaN layer resulted in a deterioration in epitaxial quality and the appearance of serious surface cracks because of the concentration of Al atoms near pits, which enabled new and bigger centers of defects to form. A crack-free surface and relatively high crystal quality were achieved by inserting a Si_xN_y interlayer into a GaN epilayer; the resultant improvement in crystal quality was attributed to the bending and annihilation of dislocations. For a sample in which Si_xN_y was not inserted, Raman and photoluminescence measurements revealed that the stresses were 0.535 and 0.741 GPa, respectively. The addition of a single Si_xN_y interlayer into the GaN epilayer significantly reduced these stresses to 0.279 and 0.556 GPa, respectively.
机译:在这项研究中,通过使用有机金属化学气相沉积法在Si衬底上制备了1.61μm厚的GaN /渐变AlGaN / AlN外延层。为了确定Si_xN_y中间层的插入是否增强了GaN层的外延质量,在不同位置插入了不同数量的Si_xN_y中间层,并研究了其效果。除了分析晶体质量外,还通过执行拉曼,光致发光和曲率测量来详细研究外延层应力。将Si_xN_y插入AlGaN层会导致外延质量下降,并且由于坑附近的Al原子集中而导致出现严重的表面裂纹,从而形成了新的更大的缺陷中心。通过在GaN外延层中插入Si_xN_y中间层,可以实现无裂纹的表面和较高的晶体质量。晶体质量的改善归因于位错的弯曲和an没。对于未插入Si_xN_y的样品,拉曼光谱和光致发光测量表明应力分别为0.535 GPa和0.741 GPa。将单个Si_xN_y中间层添加到GaN外延层中可将这些应力分别显着降低至0.279和0.556 GPa。

著录项

  • 来源
    《Journal of Crystal Growth》 |2014年第1期|27-32|共6页
  • 作者单位

    Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC;

    Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC;

    Graduate Institute of Precision Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC,Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan, ROC;

    Department of Materials Science and Engineering, National Chung Hsing University, Taichung 40227, Taiwan, ROC,Department of Materials Science and Engineering, Da-Yeh University, Changhua 51591 Taiwan, ROC;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1.Stresses; A1.Dislocations; A3.Metalorganic chemical vapor deposition; B1.Nitrides; B2.Semiconducting Ⅲ-Ⅴ materials;

    机译:A1。应力A1。脱位;A3。金属有机化学气相沉积;B1氮化物;B2。Ⅲ-Ⅴ族半导体材料;

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