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    • 109. 发明授权
    • Low-bandgap source and drain formation for short-channel MOS transistors
    • 短沟道MOS晶体管的低带隙源极和漏极形成
    • US06274894B1
    • 2001-08-14
    • US09375920
    • 1999-08-17
    • Karsten WieczorekManfred HorstmannFrederick N. Hause
    • Karsten WieczorekManfred HorstmannFrederick N. Hause
    • H01L31072
    • H01L29/0847H01L29/1083H01L29/165H01L29/41766H01L29/66477H01L29/66628H01L29/66636
    • A transistor having source and drain regions which include lower-bandgap portions and a method for making the same are provided. A gate conductor is formed over a gate dielectric on a semiconductor substrate. The gate conductor is covered on all sides with oxide or another dielectric for protection during subsequent processing. Anisotropic etching is used to form shallow trenches in the substrate on either side of the gate conductor. The trenches are bounded by the dielectric-coated gate conductor and by dielectric isolation regions, or by an adjacent gate conductor in the case of non-isolated transistors. A selective epitaxy technique may then be used to grow a layer within each trench of a material having a bandgap lower than that of the semiconductor substrate. The lower-bandgap material is preferably grown only on the exposed semiconductor surfaces in the trenches, and not on the surrounding dielectric regions. The lower-bandgap material may be an undoped layer used as a buffer for interdiffusion of dopants between the channel and source/drain regions of the transistor. The lower-bandgap material may also be a heavily doped layer with the same carrier type as the semiconductor substrate, used as a halo region to reduce punchthrough and threshold voltage lowering effects. The buffer and halo functions may also be combined using multilayer source/drain structures. The portion of the trench above such buffer and/or halo layers is filled with a semiconductor material doped with the opposite carrier type than that of the substrate to form lightly-doped-drain portions of the transistor source and drain.
    • 提供具有包括低带隙部分的源极和漏极区域的晶体管及其制造方法。 在半导体衬底上的栅极电介质上形成栅极导体。 栅极导体在所有侧面都被氧化物或另一个电介质覆盖,用于在后续处理过程中进行保护。 各向异性蚀刻用于在栅极导体两侧的衬底中形成浅沟槽。 在非隔离晶体管的情况下,沟槽由电介质涂覆的栅极导体和介电隔离区域或相邻栅极导体限制。 然后可以使用选择性外延技术来在具有比半导体衬底的带隙低的带隙的材料的每个沟槽内生长层。 较低带隙材料优选仅在沟槽中的暴露的半导体表面上生长,而不是在周围的电介质区域上生长。 低带隙材料可以是用作缓冲器的未掺杂层,用于在晶体管的沟道和源极/漏极区之间的掺杂剂的相互扩散。 较低带隙材料也可以是具有与半导体衬底相同载流子类型的重掺杂层,用作卤素区域以减少穿通和阈值电压降低效应。 缓冲区和晕圈功能也可以使用多层源/漏结构组合。 在这种缓冲区和/或晕圈之上的沟槽部分填充掺杂有与衬底相反的载体类型的半导体材料,以形成晶体管源极和漏极的轻掺杂漏极部分。