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    • 6. 发明申请
    • LOW RC PRODUCT TRANSISTORS IN SOI SEMICONDUCTOR PROCESS
    • SOI半导体工艺中的低RC产品晶体管
    • US20060084235A1
    • 2006-04-20
    • US10965964
    • 2004-10-15
    • Alexander BarrOlubunmi AdetutuBich-Yen NguyenMarius OrlowskiMariam SadakaVoon-Yew TheanTed White
    • Alexander BarrOlubunmi AdetutuBich-Yen NguyenMarius OrlowskiMariam SadakaVoon-Yew TheanTed White
    • H01L21/336
    • H01L29/66772H01L29/66636H01L29/78618
    • A semiconductor fabrication process includes forming a transistor gate overlying an SOI wafer having a semiconductor top layer over a buried oxide layer (BOX) over a semiconductor substrate. Source/drain trenches, disposed on either side of the gate, are etched into the BOX layer. Source/drain structures are formed within the trenches. A depth of the source/drain structures is greater than the thickness of the top silicon layer and an upper surface of the source/drain structures coincides approximately with the transistor channel whereby vertical overlap between the source/drain structures and the gate is negligible. The trenches preferably extend through the BOX layer to expose a portion of the silicon substrate. The source/drain structures are preferably formed epitaxially and possibly in two stages including an oxygen rich stage and an oxygen free stage. A thermally anneal between the two epitaxial stages will form an isolation dielectric between the source/drain structure and the substrate.
    • 半导体制造工艺包括在半导体衬底上的掩埋氧化物层(BOX)上形成半导体顶层的SOI晶片的晶体管栅极。 设置在栅极两侧的源极/漏极沟槽被蚀刻到BOX层中。 源极/漏极结构形成在沟槽内。 源极/漏极结构的深度大于顶部硅层的厚度,并且源极/漏极结构的上表面大致与晶体管沟道重合,源极/漏极结构与栅极之间的垂直重叠可忽略不计。 沟槽优选地延伸穿过BOX层以暴露硅衬底的一部分。 源极/漏极结构优选外延地形成,并且可能包括富氧阶段和无氧阶段的两个阶段。 两个外延级之间的热退火将在源极/漏极结构和衬底之间形成隔离电介质。