Patent ID: 6861341
Filing Date: 2005-03-01
Classification: B81B,B81C,H01L

Abstract:
1. A fabrication method for integrating a plurality of heterogeneous circuit devices in a single substrate, comprising: providing a substrate; forming a first ion implantation protective layer over the substrate; removing a portion of the first ion implantation protective layer to expose a first portion of the substrate; forming a high voltage well by ion implantation of a first circuit device in the first potion of substrate using the partially removed first ion implantation protective layer to allow ion implantation at the first portion; forming a second ion implantation protective layer over at least the first portion of the substrate; removing a second portion of the first ion implantation protective layer to expose a second portion of the substrate; and ion implanting a first low voltage well of a second circuit device in the second portion of the substrate using the partially removed first ion implantation protective layer and the second ion implantation protective layer to allow ion implantation at the second portion.