Patent ID: 6444550
Filing Date: 2002-09-03
Classification: H01L,Y10S

Abstract:
A method of manufacturing a semiconductor device, the method comprising the sequential steps of:forming a retrograde impurity, implant of a first conductive type in a surface portion of a semiconductor substrate, wherein the retrograde impurity implant has an impurity concentration profile increasing from a main surface of the substrate to an impurity concentration peak at a first depth below the main surface of the substrate; laser annealing to melt a portion of the substrate and to flatten the impurity concentration peak of the retrograde impurity implant, thereby forming the retrograde impurity implant having a substantially flat impurity concentration peak at a second depth below the main surface of the substrate; and forming a semiconductor layer at a predetermined thickness on the main surface of substrate to controllably localize the flat impurity concentration peak at a predetermined depth below an upper surface of the semiconductor layer.