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    • 8. 发明申请
    • Methods of fabricating gallium nitride semiconductor layers on substrates including non-gallium nitride posts, and gallium nitride semiconductor structures fabricated thereby
    • 在包括非氮化镓柱的衬底上制造氮化镓半导体层的方法以及由此制造的氮化镓半导体结构
    • US20050161702A1
    • 2005-07-28
    • US11074485
    • 2005-03-08
    • Kevin LinthicumThomas GehrkeRobert Davis
    • Kevin LinthicumThomas GehrkeRobert Davis
    • H01L21/20H01L29/15C30B1/00H01L31/0312
    • H01L21/0237H01L21/0243H01L21/02433H01L21/02447H01L21/02458H01L21/0254H01L21/0262
    • A substrate includes non-gallium nitride posts that define trenches therebetween, wherein the non-gallium nitride posts include non-gallium nitride sidewalls and non-gallium nitride tops and the trenches include non-gallium floors. Gallium nitride is grown on the non-gallium nitride posts, including on the non-gallium nitride tops. Preferably, gallium nitride pyramids are grown on the non-gallium nitride tops and gallium nitride then is grown on the gallium nitride pyramids. The gallium nitride pyramids preferably are grown at a first temperature and the gallium nitride preferably is grown on the pyramids at a second temperature that is higher than the first temperature. The first temperature preferably is about 1000° C. or less and the second temperature preferably is about 1100° C. or more. However, other than temperature, the same processing conditions preferably are used for both growth steps. The grown gallium nitride on the pyramids preferably coalesces to form a continuous gallium nitride layer. Accordingly, gallium nitride may be grown without the need to form masks during the gallium nitride growth process. Moreover, the gallium nitride growth may be performed using the same processing conditions other than temperatures changes. Accordingly, uninterrupted gallium nitride growth may be performed.
    • 衬底包括在其间限定沟槽的非氮化镓柱,其中非氮化镓柱包括非氮化镓侧壁和非氮化镓顶部,并且沟槽包括非镓层。 氮化镓在非氮化镓柱上生长,包括在非氮化镓顶上。 优选地,在非氮化镓顶上生长氮化镓金字塔,然后在氮化镓金字塔上生长氮化镓。 氮化镓金字塔优选在第一温度下生长,并且氮化镓优选在高于第一温度的第二温度下生长在锥体上。 第一温度优选为约1000℃以下,第二温度优选为约1100℃以上。 然而,除了温度之外,相同的加工条件优选用于两个生长步骤。 金字塔上生长的氮化镓优选聚结形成连续的氮化镓层。 因此,可以在氮化镓生长过程中不需要形成掩模来生长氮化镓。 此外,可以使用与温度变化以外的相同的处理条件来进行氮化镓生长。 因此,可以进行不间断的氮化镓生长。