Patent ID: 6323506
Filing Date: 2001-11-27
Classification: H01L

Abstract:
A lateral metal-oxide-semiconductor field effect transistor (LMOSFET) having a self-aligned gate, the LMOSFET comprising:a first layer of silicon carbide semiconductor material having a p-type conductivity;a second layer of silicon carbide semiconductor material having an n-type conductivity formed on the first layer;source and drain regions having n-type conductivities formed in the second silicon carbide semiconductor layer, the n-type conductivities of the source and drain regions being greater than the n-type conductivity of the second silicon carbide layer;a trench extending through the second silicon carbide semiconductor layer and partially into the first silicon carbide semiconductor layer so that the source and drain regions are substantially lateral thereto, the trench coated with a layer of an electrically insulating oxide material and partially filled with a layer of metallic material, the layers of oxide and metallic material forming a gate structure;a channel region defined in the first layer beneath the gate structure; andelectrical contacts associated with the source and drain regions, and the gate structure thereby establishing source, drain, and gate electrodes of the LMOSFET.