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    • 10. 发明授权
    • Integration of trench MOS with low voltage integrated circuits
    • 沟槽MOS与低压集成电路的集成
    • US09209297B2
    • 2015-12-08
    • US14083557
    • 2013-11-19
    • GLOBALFOUNDRIES Singapore Pte. Ltd.
    • Purakh Raj VermaYi LiangDong Yemin
    • H01L21/8238H01L29/78H01L27/092H01L29/66H01L29/417H01L29/423
    • H01L29/7827H01L21/823814H01L27/0922H01L29/41741H01L29/4236H01L29/42368H01L29/66666H01L29/7833
    • A high voltage trench MOS and its integration with low voltage integrated circuits. Embodiments include forming a first trench in a substrate, the first trench having a first width; forming a first oxide layer on side surfaces of the first trench; forming a second trench in the substrate, below the first trench, the second trench having a second width less than the first width; forming a second oxide layer on side and bottom surfaces of the second trench; forming spacers on sides of the first and second trenches; removing a portion of the second oxide layer from the bottom surface of the second trench between the spacers; filling the first and second trenches with a first poly-silicon to form a drain region; removing the spacers, exposing side surfaces of the first poly-silicon; forming a third oxide layer on the side surfaces and a top surface of the first poly-silicon; and filling a remainder of the first and second trenches with a second poly-silicon to form a gate region on each side of the drain region.
    • 高压沟槽MOS及其与低压集成电路的集成。 实施例包括在衬底中形成第一沟槽,第一沟槽具有第一宽度; 在所述第一沟槽的侧表面上形成第一氧化物层; 在所述衬底中形成第二沟槽,在所述第一沟槽下方,所述第二沟槽具有小于所述第一宽度的第二宽度; 在所述第二沟槽的侧表面和底表面上形成第二氧化物层; 在第一和第二沟槽的侧面上形成间隔物; 从所述间隔件之间的所述第二沟槽的底表面去除所述第二氧化物层的一部分; 用第一多晶硅填充第一和第二沟槽以形成漏区; 去除间隔物,暴露第一多晶硅的侧表面; 在所述第一多晶硅的侧表面和顶表面上形成第三氧化物层; 以及用第二多晶硅硅填充所述第一和第二沟槽的剩余部分,以在所述漏极区域的每一侧上形成栅极区域。