Patent ID: 6133147
Filing Date: 2000-10-17
Classification: H01L

Abstract:
A process for preparing a metallic interconnecting plug in a semiconductor device which comprises the steps of: i) forming an insulating layer on the surface of a semiconductor substrate or a metal underlayer of the semiconductor device, ii) forming a hole in the insulating layer to expose the surface of the semiconductor substrate or the metal underlayer, iii) exposing the surface of the insulating layer to the vapor of a blocking agent under a pressure ranging from 10.sup.-12 to 10 torr for a controlled time period so that a layer of the blocking agent is formed only on the outer surface of the insulating layer, the layer of the blocking agent not extending over the inside walls of the hole, whereby the vapor of blocking agent follows the Knudsen diffusion rate expressed by the following formula: ##EQU2## wherein: r is hole radius,R is the gas constant,T is the temperature of the gas, andM is the molecular weight, iv) selectively depositing a conductive metal in the hole using a chemical vapor deposition method to form the metallic interconnecting plug which extends from the surface of the semiconductor substrate or the metal underlayer to the level of the outer surface of the insulating layer, and v) removing the layer of the blocking agent from the surface of the insulating layer.