Patent ID: 6403443
Filing Date: 2002-06-11
Classification: H01L

Abstract:
A method for reducing surface humps of a doped amorphous silicon layer, wherein a substrate comprising an electrode surface is provided, a dielectric layer is formed to cover the substrate and the electrode surface, and at least an opening is formed in the dielectric layer to expose the electrode surface, the method comprising:a first deposition step to form a conformal first doped amorphous silicon layer along a surface profile of the substrate; a second deposition step to form a second amorphous silicon layer on the first doped amorphous silicon layer and filling the opening; and a third deposition step to form a third amorphous silicon layer on the second amorphous silicon layer; wherein a dopant concentration of the second amorphous silicon layer is lower than those of the first and the third amorphous silicon layers.