Patent ID: 9418998
Filing Date: 2016-08-16
CPC Classification: G11C,H01L

Claim Text:
1. A semiconductor device, comprising: a semiconductor substrate; a bit line structure on the semiconductor substrate, the bit line structure comprising a first upper surface near a first sidewall of the bit line structure and a second upper surface near a second sidewall of the bit line structure, wherein the second sidewall is opposite the first sidewall; and a storage contact plug adjacent the first sidewall of the bit line structure, the storage contact plug extending over the first upper surface of the bit line structure, wherein the first upper surface of the bit line structure slopes downward toward the first sidewall of the bit line structure, wherein the first upper surface of the bit line structure is more gradually sloped closer to the first sidewall of the bit line structure and is more steeply sloped distal from the first sidewall of the bit line structure, wherein the second upper surface of the bit line structure slopes downward toward the second sidewall of the bit line structure, and wherein first and second shapes of the first and second upper surfaces of the bit line structure, respectively, are asymmetrical with respect to each other.