Patent ID: 8748961
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A buried bit line disposed in a trench of a substrate, comprising: a diffusion region formed in a portion of the substrate, adjacent to only one of two opposite sidewalls of the trench; a blocking layer formed on a portion of only the other of the two opposite sidewalls of the trench; a conductive plug formed in the trench, covering sidewalls of the diffusion region and the blocking layer; a bottom insulating liner covering a lower sidewall portion and a bottom surface of the trench; and a top insulating liner covering an upper sidewall portion of the trench, wherein the bottom insulating liner and the top insulating liner are separated from each other, and wherein the diffusion region is adjacent to the sidewall of the trench not covered by the bottom insulating liner and the top insulating liner, wherein the conductive plug comprises: