A Diamond Field-Effect Transistor with Air-Bridge-Like Source-Field Plate Structure

Abstract

The invention relates to a diamond field effect transistor with an air bridge type source field plate structure. The diamond field effect transistor includes: a substrate layer, an epitaxial layer, a gate dielectric layer, a source electrode, a drain electrode, a gate electrode, a passivation layer, a source field plate, an air layer and a support layer, the epitaxial layer is located on the substrate layer, and the epitaxial layer A source electrode and a drain electrode are arranged at both ends of the upper part, a gate electrode is arranged between the source electrode and the drain electrode, a gate dielectric layer is arranged between the gate electrode and the epitaxial layer, and a passivation layer is arranged on both sides of the gate dielectric layer, and the passivation layer is respectively connected to the epitaxial layer. The source electrode is in contact with the drain electrode, a supporting layer is arranged between the gate electrode and the source field plate, and an air layer is arranged between the passivation layer and the source field plate. The invention can reduce the grid-source feedback capacitance and the grid-drain feedback capacitance, improve the power gain and operating frequency, and simultaneously increase the breakdown voltage.

Description

technical field [0001] The invention relates to the field of diamond field effect transistors, in particular to a diamond field effect transistor with an air bridge-like source field plate structure. Background technique [0002] In terms of material properties, the third-generation semiconductor gallium nitride (GaN) has the advantages of large band gap, high critical breakdown electric field, high electron saturation velocity, and strong radiation resistance. Therefore, gallium nitride high electron mobility transistors (GaN HEMT) has strong ability of high frequency, pressure resistance, high temperature resistance and harsh environment. However, its thermal conductivity is still very low compared with diamond, and there are serious traps, so there is current collapse when outputting high power density, which seriously restricts the output capability of high power density. Due to its high breakdown voltage, high power density, high electron mobility, and high thermal con...

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Problems solved by technology

However, the traditional source field plate structure will increase the gate-source and gate-drain feedback capacitance, which will reduce the power gain and operating frequency

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