Patent ID: 7242040
Filing Date: 2007-07-10
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate having opposed first and second major surfaces; and a first and a second junction field-effect transistor each on a discrete location on the first major surface of the substrate, each of the junction field-effect transistors comprising: a drain layer of an n-type semiconductor material on and non-coextensive with the first surface of the substrate such that portions of the substrate surrounding the drain layer are exposed; a drift layer of an n-type semiconductor material on and non-coextensive with the drain layer such that portions of the drain layer are exposed, the drift layer having a lower conductivity than the drain layer; one or more discrete raised regions in spaced relation on the drift layer, each of the raised regions comprising a channel region of an n-type semiconductor material on the drift layer and a source region of an n-type semiconductor material on the channel region, the material of the source region having a higher conductivity than that of the channel region; a gate region of a p-type semiconductor material on the drift layer adjacent the one or more raised regions and forming a rectifying junction with n-type material of the drift layer and the channel region(s); and ohmic contacts on the gate and source regions and on exposed portions of the drain layer.