Patent ID: 9076730
Filing Date: 2015-07-07
Classification: H01L

Abstract:
1. A method of making a metal silicide thin film and ultra-shallow PN junctions, comprising: A. providing a semiconductor substrate; B. using a first mixture of metal and semiconductor dopants as a target, depositing a first mixture film on the semiconductor substrate by physical vapor deposition; C. removing the first mixture film by wet etching; and D. performing annealing on the semiconductor substrate subsequent to the wet etching thereby forming concurrently the metal silicide thin film and ultra-shallow PN junctions; wherein before step D, steps B and C are repeated such that a second mixture film is deposited after the first mixture film is removed, and that the second mixture film is removed by wet etching before step D is performed; wherein the ultra-shallow PN junctions have a depth about 1-15 nm.