Self-aligned shield structure for realizing high frequency power MOSFET devices with improved reliability
First Claim
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1. A field effect transistor having reduced gate to drain capacitance comprising:
- a semiconductor body having a major surface, a source region of first conductivity-type abutting said surface, a drain region of said first conductivity-type abutting said surface and spaced from said source region by a channel, a gate overlying said channel and part of said drain and insulated therefrom by a dielectric material, and a gate/drain shield between the gate and drain aligned with and spaced from said gate with no overlap of the gate on the shield and overlying said drain and insulated therefrom.
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Abstract
A high frequency power field effect transistor has a self-aligned gate-drain shield adjacent to the gate and overlying the drain. Fabrication of the structure does not require complex or costly processing and the resulting self-aligned shield structure minimizes increase to input and output capacitances. Hot carrier injection and related shifts are reduced thereby improving reliability of the transistor.
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Citations
11 Claims
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1. A field effect transistor having reduced gate to drain capacitance comprising:
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a semiconductor body having a major surface, a source region of first conductivity-type abutting said surface, a drain region of said first conductivity-type abutting said surface and spaced from said source region by a channel, a gate overlying said channel and part of said drain and insulated therefrom by a dielectric material, and a gate/drain shield between the gate and drain aligned with and spaced from said gate with no overlap of the gate on the shield and overlying said drain and insulated therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification