Patent ID: 6258616
Filing Date: 2001-07-10
Classification: H01L,H01S

Abstract:
A method for making a semiconductor device having a buried doped layer of semiconductor material and a non-alloyed ohmic contact to the buried doped layer, the method comprising the steps of:forming a doped layer of semiconductor material of a given thickness;forming at least one delta-doped monolayer over at least a portion of the given thickness of the doped layer of the semiconductor device;placing a chemically selective stop-etch layer of semiconductor material on the doped layer;forming at least one layer of semiconductor material on the stop-etch layer to provide a multilayer structure, the doped layer forming a buried doped layer of the multilayer structure;removing a portion of the multilayer structure with an etchant to define an active region of the semiconductor device, the stop-etch layer preventing the etchant from removing the delta-doped monolayer; anddepositing a non-alloyed metal film over the delta-doped monolayer, the non-alloyed metal film forming an ohmic contact to the buried doped layer.