Patent ID: 8697570
Filing Date: 2014-04-15
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: forming a first pattern having a contact hole through which a top surface of a conductive area of a semiconductor substrate is exposed, wherein the first pattern comprises a conductive layer of polysilicon and a mask pattern of electrically insulative material directly on the conductive layer of polysilicon; forming a conformal first silicon layer on the exposed top surface of the conductive area and directly on a side wall surface of the first pattern including across an interface between the conductive layer and the mask pattern, wherein the first silicon layer is formed in contact with a side wall surface of the conductive pattern and with a sidewall surface of the mask pattern to fill part of the contact hole, the first silicon layer being formed using a first compound whose chemical formula contains at least two silicon atoms; forming a second silicon layer on the first silicon layer to fill the remainder of the contact hole, the second silicon layer being formed using a second compound whose chemical formula contains fewer silicon atoms than that of the first compound; removing portions of the first silicon layer and the second silicon layer and removing the mask pattern to form a contact plug comprising portions of the first silicon layer and the second silicon layer remaining in the contact hole.