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    • 7. 发明申请
    • METHODS FOR GROWING DEFECT-FREE HETEROEPITAXIAL LAYERS
    • 用于生长无缺陷的异相层的方法
    • WO99019546A1
    • 1999-04-22
    • PCT/US1998/020484
    • 1998-10-06
    • C30B23/02C30B25/02C30B25/18C30B23/04C30B25/04C30B25/14C30B29/40
    • C30B23/02C30B25/02C30B25/18
    • New methods for growing threading dislocation free heteroepitaxy are proposed and investigated theoretically. The first method contains four key steps: Stranski-Krastanov island (14) formation, strain relaxation by defect nucleation, in-situ defect removal, and island coalescence. The central idea is that the defects (16) are utilized to relax the lattice strain, and as soon as the strain is relaxed, the dislocation segments are removed that will propagate to the surface of the film. As a result, the heteroepitaxial film or layer is expected to be relaxed but be free of harmful threading dislocations regardless of the degree of lattice mismatch. In the second method, single crystal islands or patches are grown initially which are a few hundred nanometers or less in diameter. The patches serve as nucleation sites for growth of single crystal heteroepitaxial layers. Because of the very small patch size, the stress (normal stress and shear stress) due to lattice mismatch will be reduced significantly. As the growth proceeds, the size of nucleation islands increases in both vertical and lateral directions and the discrete islands soon coalesce to form a continuous thin film. If all coalescing islands have the same or nearly the same crystal orientation, then the net stress will be close to zero, and a smooth, defect-free heteroepitaxial layer can be grown to any thickness.
    • 理论上提出和研究了用于生长穿透无位错异质外延的新方法。 第一种方法包括四个关键步骤:Stranski-Krastanov岛(14)形成,通过缺陷成核的应变弛豫,原位缺陷去除和岛聚结。 中心思想是利用缺陷(16)来松弛晶格应变,并且一旦应变松弛,就去除位错段,其将传播到膜的表面。 结果,不管晶格失配的程度如何,预期异质外延膜或层被放宽,但是没有有害的穿透位错。 在第二种方法中,初始生长直径为几百纳米或更小的单晶岛或斑块。 该贴片用作单晶异质外延层生长的成核位点。 由于贴片尺寸非常小,由于晶格失配引起的应力(正应力和剪切应力)将显着降低。 随着生长的进行,成核岛的大小在垂直和横向两个方向都增加,并且离散的岛很快聚结以形成连续的薄膜。 如果所有聚结岛具有相同或几乎相同的晶体取向,则净应力将接近零,并且可以生长平滑无缺陷的异质外延层至任何厚度。