GALLIUM NITRIDE TRANSISTORS WITH MULTIPLE THRESHOLD VOLTAGES AND THEIR METHODS OF FABRICATION

    公开(公告)号:US20200235216A1

    公开(公告)日:2020-07-23

    申请号:US16630143

    申请日:2017-09-28

    Abstract: Gallium nitride transistors having multiple threshold voltages are described. In an example, a transistor includes a gallium nitride layer over a substrate, a gate stack over the gallium nitride layer, a source region on a first side of the gate stack, and a drain region on a second side of the gate stack, the second side opposite the first side, wherein the gate stack has a gate length in a first direction extending from the source region to the drain region, the gate stack having a gate width in a second direction perpendicular to the first direction and parallel to the source region and the drain region. The transistor also includes a polarization layer beneath the gate stack and on the GaN layer, the polarization layer having a first portion having a first thickness under a first gate portion and a second thickness under a second gate portion.

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