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    • 93. 发明授权
    • E-mode HFET device
    • E型HFET器件
    • US08669591B2
    • 2014-03-11
    • US13337753
    • 2011-12-27
    • Fabio Alessio MarinoPaolo Menegoli
    • Fabio Alessio MarinoPaolo Menegoli
    • H01L29/66
    • H01L29/1075H01L29/1029H01L29/42316H01L29/42364H01L29/42372H01L29/7782H01L29/7787
    • The present invention describes a transistor based on a Hetero junction FET structure, where the metal gate has been replaced by a stack formed by a highly doped compound semiconductor and an insulating layer in order to achieve enhancement mode operation and at the same time drastically reduce the gate current leakage. The combination of the insulating layer with a highly doped semiconductor allows the tuning of the threshold voltage of the device at the desired value by simply changing the composition of the semiconductor layer forming the gate region and/or its doping allowing a higher degree of freedom. In one of the embodiment, a back-barrier layer and a heavily doped threshold tuning layer are used to suppress Short Channel Effect phenomena and to adjust the threshold voltage of the device at the desired value. The present invention can be realized both with polar and non-polar (or semi-polar) materials.
    • 本发明描述了一种基于异质结结FET结构的晶体管,其中金属栅极被由高掺杂化合物半导体和绝缘层形成的叠层替代,以便实现增强模式操作,并同时大大减少 栅极电流泄漏。 绝缘层与高掺杂半导体的组合允许通过简单地改变形成栅极区域的半导体层的组成和/或其掺杂允许更高的自由度来将器件的阈值电压调谐到所需的值。 在一个实施例中,使用后阻挡层和重掺杂阈值调谐层来抑制短沟道效应现象并且将器件的阈值电压调整到期望值。 本发明可以用极性和非极性(或半极性)材料实现。