Patent ID: 6083814
Filing Date: 2000-07-04
Classification: H01L,Y10S

Abstract:
A method for producing a pn-junction for a semiconductor device of SiC intended to have at least one lateral zone of junction termination with a lower doping concentration of a first conductivity type than a main zone for smearing out the electrical field at said junction, said method comprising at least the steps of:a) applying a first layer of SiC of said first conductivity type, p or n, on top of a second layer of a second conductivity type, opposite to the first type, said first layer either 1) having a first sub-layer closest to said second layer able to form a pn-junction with an acceptably high breakdown voltage and a second sub-layer on top thereof able to form an ohmic contact for the device, or 2) being one layer able to both form a pn-junction with an acceptably high breakdown voltage and an ohmic contact for the device, wherein in case of 1) the sub-layers are applied in different steps,b) applying a mask on said first layer over a portion thereof where said main zone and said ohmic contact are to be formed, andc) etching through the first layer to the second layer while leaving a said main zone of said first layer and a contact layer thereof under said mask for exposing said second layer laterally thereto for later implantation of dopants of said first type into a surface layer of the second layer for forming at least one said lateral junction termination zone therein, wherein the entire first layer is in step a) formed by applying it over the entire surface of the second layer without any presence of any mask layer.