Patent ID: 9379002
Filing Date: 2016-06-28
CPC Classification: G11C,H01L

Claim Text:
1. A semiconductor device, comprising: a semiconductor substrate; a bit line structure extending along an upper part of the semiconductor substrate and having oppositely facing first and second side surfaces; an outer bit line spacer disposed on the first side surface of the bit line structure; an inner bit line spacer including a first part interposed between the bit line structure and the outer bit line spacer, and a second part interposed between the semiconductor substrate and the outer bit line spacer; and a block bit line spacer interposed between the outer bit line spacer and the second part of the inner bit line spacer, and wherein the block bit line spacer has a planar horizontal upper surface, and a planar horizontal lower surface such that the upper and lower surfaces of the block bit line spacer are parallel, and the outer bit line spacer, the inner bit line spacer, and the block bit line spacer delimit a first air-gap constituting a void between the outer bit line spacer, the inner bit line spacer, and the block bit line spacer.