Patent ID: 6187091
Filing Date: 2001-02-13
Classification: C23C,C30B,H01L

Abstract:
A process for growing a silicon epitaxial layer on a main surface of a silicon wafer which is held in a horizontal type of chamber, said silicon wafer having a center portion and peripheral portions, the process comprising the steps of:concurrently feeding parallel flows of reactive gas from a plurality of positions which are arranged in a width direction of the flows into the chamber so that an epitaxial layer is formed in the vicinity of the center of the silicon wafer and in the vicinity of the peripheral portions of the wafer, the reactive gas comprising a silicon source, a dopant and hydrogen;absorbing pressure variations in the flow of reactive gas toward the center of the silicon wafer; andadjusting the concentration of the dopant in the reactive gas which is fed toward the center portion of the silicon wafer so that the resistivity of the epitaxial layer formed in the vicinity of the center of the silicon wafer is approximately the same as that of the vicinity of the peripheral portions thereof.