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    • 7. 发明申请
    • Semiconductor substrate, field-effect transistor, and their production methods
    • 半导体衬底,场效晶体管及其制作方法
    • US20060258126A1
    • 2006-11-16
    • US10544310
    • 2003-02-06
    • Ichiro ShionoMasaharu NinomiyaHazumu Kougami
    • Ichiro ShionoMasaharu NinomiyaHazumu Kougami
    • H01L31/00H01L21/20
    • H01L29/165H01L21/02381H01L21/0245H01L21/02502H01L21/02505H01L21/0251H01L21/02532H01L21/0262H01L29/1054
    • A semiconductor substrate manufacturing method has a first layer formation process, a second layer formation process, a heat treatment process, and a polishing process; in the first layer formation process, the thickness of the first SiGe layer is set to less than twice the critical thickness, which is the film thickness at which dislocations appear and lattice relaxation occurs due to increasing film thickness; in the second layer formation process, the Ge composition ratio of the second SiGe layer is at least at the contact face with the first SiGe layer or with the Si layer, set lower than the maximum value of the Ge composition ratio in the first SiGe layer, and moreover, a gradient composition region in at least a portion of which the Ge composition ratio increases gradually toward the surface is formed. By this means, the penetrating dislocation density is kept low, surface roughness is low, and worsening of roughness at the surface and at interfaces due to heat treatment in device manufacturing processes or similar is prevented.
    • 半导体衬底制造方法具有第一层形成工艺,第二层形成工艺,热处理工艺和抛光工艺; 在第一层形成工艺中,第一SiGe层的厚度被设定为小于临界厚度的两倍,临界厚度是由于增加膜厚而发生位错的膜厚度和晶格弛豫; 在第二层形成工艺中,第二SiGe层的Ge组成比至少在与第一SiGe层或Si层的接触面处设定为低于第一SiGe层中的Ge组成比的最大值 ,并且形成至少部分Ge组成比逐渐朝向表面增加的梯度组成区域。 通过这种方式,穿透位错密度保持较低,表面粗糙度低,并且防止了器件制造过程中类似的热处理在表面和界面处的粗糙度恶化。