Patent ID: 9123645
Filing Date: 2015-09-01
Classification: H01L

Abstract:
1. A method of making a semiconductor device, the method comprising: providing a semiconductor having a semiconductor surface that includes a mesa, wherein the mesa is defined by a first portion of the semiconductor that is thicker than a second portion of the semiconductor; forming a passivation layer on the mesa; providing a first mask overlying the passivation layer with a first mask opening over the mesa and adapted to define a Schottky contact; etching through the passivation layer under the first mask opening to expose part of the semiconductor surface; depositing through the first mask opening the Schottky contact having a first width on the exposed part of the semiconductor surface, wherein the Schottky contact directly contacts the semiconductor surface, and wherein the passivation layer top surface is at a first height above the semiconductor surface, and the Schottky contact has a second height above the semiconductor surface that is less than the first height; providing a second mask overlying the passivation layer with a second mask opening encompassing the Schottky contact, the second mask opening having a second width that is greater than the first width; forming a further conductor within the second mask opening on the Schottky contact and extending over portions of the passivation layer on either side of the Schottky contact, wherein the further conductor has the second width; and forming spaced apart Ohmic source and drain contacts on the mesa before or after depositing the Schottky contact.