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Strain states of AIN/GaN-stress mitigating layer and their effect on GaN buffer layer grown by ammonia molecular beam epitaxy on 100-mm Si(111)

机译:AIN / GaN应力缓解层的应变状态及其对100mm Si(111)上氨分子束外延生长的GaN缓冲层的影响

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摘要

The effect of strain states of AlN/GaN-stress mitigating layer (SML) on buried crack density and its subsequent influence on the residual stresses in GaN buffer layers grown using ammonia-molecular bearn epitaxy on 100-mm Si(111) substrate has been investigated. Different stages involved in the formation of buried cracks, which are crack initialization, growth of relaxed. A1N layer, and subsequent lateral over growth, are identified using in-situ curvature measurements. While the increase of GaN thickness in AlN/GaN-SML enhanced its compressive strain relaxation and resulted in reduced buried crack spacing, the variation of AlN thickness did not show any effect on the crack spacing. Moreover, the decrease in the crack spacing (or increase in the buried crack density) was found to reduce the residual compression in 1st and 2nd GaN layers of AlN/GaN-SML structure. The higher buried crack density relaxed the compressive strain in 1st GaN layer, which further reduced its ability to compensate the tensile stress generated during substrate cool down, and hence resulted in lower residual compressive stress in 2nd GaN layer.
机译:已经研究了AlN / GaN应力缓解层(SML)的应变状态对埋藏裂纹密度的影响以及其对使用氨分子贝尔外延在100 mm Si(111)衬底上生长的GaN缓冲层中的残余应力的影响。调查。埋藏裂缝形成的不同阶段包括裂缝的初始化,松弛的增长。使用原位曲率测量来确定AlN层以及随后的横向过度生长。尽管AlN / GaN-SML中GaN厚度的增加增强了其压缩应变松弛并导致埋入式裂纹间距减小,但AlN厚度的变化对裂纹间距没有任何影响。此外,发现裂纹间距的减小(或埋入裂纹密度的增加)减小了AlN / GaN-SML结构的第一和第二GaN层中的残余压缩。较高的掩埋裂纹密度使第一GaN层中的压缩应变松弛,这进一步降低了其补偿在衬底冷却期间产生的拉应力的能力,因此导致第二GaN层中的残余压缩应力较低。

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  • 来源
    《Journal of Applied Physics》 |2013年第12期|123503.1-123503.6|共6页
  • 作者单位

    NOVITAS-Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798;

    NOVITAS-Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798;

    Temasek Laboratories, Nanyang Technological University, Singapore 637553;

    NOVITAS-Nanoelectronics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798;

    Temasek Laboratories, Nanyang Technological University, Singapore 637553;

  • 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
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