SiC field effect transistor
First Claim
1. A SiC field effect transistor comprising:
- a SiC semiconductor layer; and
a Metal Insulator Semiconductor (MIS) transistor structure includinga source region of a first conductivity type provided in the SiC semiconductor layer,a body region of a second conductivity type provided in the SiC semiconductor layer in contact with the source region,a drift region of the first conductivity type provided in the SiC semiconductor layer in contact with the body region,a gate insulation film,a gate electrode opposed to the body region with the gate insulation film interposed between the gate electrode and the body region for forming a channel in the body region to cause electric current to flow between the drift region and the source region, anda barrier forming layer provided directly in contact with the drift region to form a junction barrier by the contact with the drift region, the barrier forming layer further being in direct contact with the source region,wherein the MIS transistor structure includes a vertical MIS transistor structure in which the source region and the drift region are spaced from each other vertically and perpendicularly to a major surface of the SiC semiconductor layer with the body region interposed therebetween,wherein the vertical MIS transistor structure further includes;
a source trench extending from the major surface of the SiC semiconductor layer to the drift region through the source region and the body region; and
a source electrode provided in contact with the source region, the body region and the drift region in the source trench with the barrier forming layer being disposed in a portion of the source electrode contacting the drift region.
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Accused Products
Abstract
A SiC field effect transistor includes: a SiC semiconductor layer; and a MIS transistor structure including a first conductivity type source region in the semiconductor layer, a second conductivity type body region in the semiconductor layer in contact with the source region, a first conductivity type drift region in the semiconductor layer in contact with the body region, a gate electrode opposed to the body region with a gate insulation film interposed between the electrode and the body region for forming a channel in the body region to cause electric current to flow between the drift region and the source region, and a barrier forming layer in contact with the drift region to form a junction barrier by the contact with the drift region, the junction barrier being lower than a diffusion potential of a body diode defined by a junction between the body region and the drift region.
77 Citations
19 Claims
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1. A SiC field effect transistor comprising:
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a SiC semiconductor layer; and a Metal Insulator Semiconductor (MIS) transistor structure including a source region of a first conductivity type provided in the SiC semiconductor layer, a body region of a second conductivity type provided in the SiC semiconductor layer in contact with the source region, a drift region of the first conductivity type provided in the SiC semiconductor layer in contact with the body region, a gate insulation film, a gate electrode opposed to the body region with the gate insulation film interposed between the gate electrode and the body region for forming a channel in the body region to cause electric current to flow between the drift region and the source region, and a barrier forming layer provided directly in contact with the drift region to form a junction barrier by the contact with the drift region, the barrier forming layer further being in direct contact with the source region, wherein the MIS transistor structure includes a vertical MIS transistor structure in which the source region and the drift region are spaced from each other vertically and perpendicularly to a major surface of the SiC semiconductor layer with the body region interposed therebetween, wherein the vertical MIS transistor structure further includes; a source trench extending from the major surface of the SiC semiconductor layer to the drift region through the source region and the body region; and a source electrode provided in contact with the source region, the body region and the drift region in the source trench with the barrier forming layer being disposed in a portion of the source electrode contacting the drift region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification