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    • 10. 发明申请
    • METHOD TO THIN A SILICON-ON-INSULATOR SUBSTRATE
    • 稀土绝缘子基板的方法
    • US20120009797A1
    • 2012-01-12
    • US13257901
    • 2010-04-20
    • Patrick ReynaudLudovic EcarnotKhalid Radouane
    • Patrick ReynaudLudovic EcarnotKhalid Radouane
    • H01L21/306
    • H01L21/30604H01L21/76254
    • The invention concerns a method to thin an initial silicon-on-insulator substrate that has a layer of silicon oxide buried between a silicon carrier substrate and a silicon surface layer. This method is noteworthy in that it includes conducting a thermal oxidation treatment of the initial substrate to cause oxidation of part of the silicon surface layer and form a thermal oxide thereon; conducting a first cycle of etching followed by cleaning of the silicon surface layer after the thermal oxidation treatment, wherein the etching of the first cycle is conducted so as fully to remove the thermal oxide from the silicon surface layer to thin it and lift off all unstable parts of the initial substrate at edges thereof to form a thinned substrate; conducting, after the first cycle, a second cycle of etching followed by cleaning of the silicon surface layer, wherein the etching of the second cycle is conducted to remove from the surface of the thinned substrate, polluting particles formed during the first etching cycle and which have deposited thereupon, in order to obtain a final SOI substrate having a thinned surface layer which forms an active layer for the substrate.
    • 本发明涉及一种薄的初始绝缘硅绝缘体衬底的方法,该衬底具有掩埋在硅载体衬底和硅表面层之间的氧化硅层。 该方法值得注意的是,它包括进行初始衬底的热氧化处理以引起部分硅表面层的氧化并在其上形成热氧化物; 进行第一次蚀刻循环,然后在热氧化处理之后清洁硅表面层,其中进行第一次循环的蚀刻,以完全从硅表面层去除热氧化物以使其变薄并提升所有不稳定 初始基板的边缘部分以形成薄的基板; 在所述第一循环之后进行第二次蚀刻循环,然后清洁所述硅表面层,其中进行所述第二循环的蚀刻以从所述薄化基板的表面去除污染在第一蚀刻循环期间形成的颗粒,并且其中 已经沉积在其上,以获得最终的SOI衬底,其具有形成用于衬底的有源层的薄化表面层。