Trench filling method employing oxygen densified gap filling CVD

Semiconductor device manufacturing: process – Formation of electrically isolated lateral semiconductive... – Grooved and refilled with deposited dielectric material

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438437, 438790, H01L 21762

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active

060431369

ABSTRACT:
A method for forming a silicon oxide layer. There is first provided a substrate. There is then formed over the substrate a silicon oxide layer, where the silicon oxide layer is formed through an ozone assisted sub-atmospheric pressure thermal chemical vapor deposition (SACVD) method employing an ozone oxidant and a tetra-ethyl-ortho-silicate (TEOS) silicon source material at an ozone:TEOS volume ratio of from about 10:1 to about 14:1. Finally, there is then annealed thermally the substrate within an oxygen containing atmosphere at a temperature of greater than about 1100 degrees centigrade to form from the silicon oxide layer a densified silicon oxide layer. The densified silicon oxide layer formed employing the method is formed with an unexpectedly low shrinkage.

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