Patent ID: 9390939
Filing Date: 2016-07-12
CPC Classification: H01L

Claim Text:
1. A method of forming an MIS contact structure, comprising: forming at least one layer of insulating material above a semiconductor layer; performing at least one contact opening etching process to form a contact opening in said at least one layer of insulating material that exposes a portion of said semiconductor layer; conformably depositing a layer of contact insulating material in said contact opening and on the exposed surface of said semiconductor layer; conformably depositing a conductive material layer on said layer of contact insulating material within said contact opening; forming a sacrificial material layer in said contact opening on said conductive material layer such that it overfills said contact opening; reducing a thickness of said sacrificial material layer so as to expose a portion, but not all, of said conductive material layer, wherein said reduced-thickness sacrificial material layer has an upper surface; performing at least one etching process to remove portions of said conductive material layer and said layer of contact insulating material positioned above said upper surface of said reduced-thickness sacrificial material layer so as to thereby define recessed portions of said conductive material layer and said layer of contact insulating material; removing said reduced-thickness sacrificial material layer; and forming a conductive contact in said contact opening that contacts said recessed portions of said conductive material layer and said layer of contact insulating material.