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    • 9. 发明申请
    • METHOD FOR POLISHING HETEROSTRUCTURES
    • 抛光方法
    • WO2008099245A1
    • 2008-08-21
    • PCT/IB2008/000156
    • 2008-01-23
    • S.O.I.TEC SILICON ON INSULATOR TECHNOLOGIESMARTINEZ, MurielSEGUIN, CorinneLOGIOU, Morgane
    • MARTINEZ, MurielSEGUIN, CorinneLOGIOU, Morgane
    • H01L21/306H01L21/20H01L21/762
    • H01L21/02024H01L21/76254
    • A polishing method of a heterostructure (12) comprising at least one relaxed superficial heteroepitaxial layer (121) on a substrate (120) made from a different material from that of said heteroepitaxial layer. The method comprises a first chemical mechanical polishing step of the surface of the heteroepitaxial layer (12) performed with a polishing cloth (14) having a first compressibility ratio and with a polishing solution having a first silica particle concentration. The first chemical mechanical polishing step is followed by a second chemical mechanical polishing step of the surface of the heteroepitaxial layer (121), said second step being performed with a polishing cloth having a second compressibility ratio, higher than said first compressibility ratio, and with a polishing solution having a second silica particle concentration, lower than said first concentration.
    • 异质结构(12)的抛光方法包括由与所述异质外延层不同的材料制成的衬底(120)上的至少一个弛豫表面异质外延层(121)。 该方法包括用具有第一可压缩比的抛光布(14)和具有第一二氧化硅颗粒浓度的抛光溶液进行的异质外延层(12)的表面的第一化学机械抛光步骤。 第一化学机械抛光步骤之后是异质外延层(121)的表面的第二化学机械抛光步骤,所述第二步骤用具有高于所述第一可压缩比的第二可压缩比的抛光布进行,并且与 具有低于所述第一浓度的第二二氧化硅颗粒浓度的抛光溶液。