STI formation in semiconductor device including SOI and bulk...

Details STI formation in semiconductor device including SOI and bulk... STI formation in semiconductor device including SOI and bulk...

2006-10-10

2006-10-10

Deo, Duy-Vu N (Department: 1765)

Semiconductor device manufacturing: process

Formation of electrically isolated lateral semiconductive...

Grooved and refilled with deposited dielectric material

C438S151000, C257S347000, C257S348000, C257S349000, C257S350000

Reexamination Certificate

active

07118986

ABSTRACT:
Methods for forming or etching silicon trench isolation (STI) in a silicon-on-insulator (SOI) region and a bulk silicon region, and a semiconductor device so formed, are disclosed. The STI can be etched simultaneously in the SOI and bulk silicon regions by etching to an uppermost silicon layer using an STI mask, conducting a timed etch that etches to a desired depth in the bulk silicon region and stops on a buried insulator of the SOI region, and etching through the buried insulator of the SOI region. The buried insulator etch for this process can be done with little complexity as part of a hardmask removal step. Further, by choosing the same depth for both the bulk and SOI regions, problems with a subsequent CMP process are avoided. The invention also cleans up the boundary between the SOI and bulk regions where silicon nitride residuals may exist.

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