Trench memory

Semiconductor device manufacturing: process – Making field effect device having pair of active regions... – Having insulated gate

Reexamination Certificate

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Details

C438S386000, C257SE21651

Reexamination Certificate

active

07445988

ABSTRACT:
A trench device and method for fabricating same are provided. The trench device has a collar with a first portion that is doped and a second portion that is undoped. Fabrication of the partially doped collar can be done by deposition of a doped insulator in the trench, removal of a portion of the doped deposition, deposition of an undoped insulator in the trench and removal of a portion of the doped and undoped insulators.

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patent: 2005/0093044 (2005-05-01), Cheng et al.

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