Shallow trench isolation type semiconductor device and method of the same
First Claim
1. A shallow trench isolation (STI) type semiconductor device employing a liner as an oxygen barrier, comprising:
- a trench sidewall thermal oxide layer formed between the liner and a silicon substrate to a thickness of 20 Å
-140 Å
, wherein a top of the liner is located at a position where a level difference from the top of the liner to an upper surface of the substrate is 150 Å
or less.
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Accused Products
Abstract
A shallow trench type (STI) type semiconductor device employs an etch-stop layer pull-pack approach and a liner as an oxygen barrier, enhancing stability of gate insulation and reliability of transistor operation, wherein a trench sidewall thermal oxide layer with a thickness of 20 Å-140 Å is formed between silicon substrate and the liner, controlling the sidewall liner tension that acts on the substrate. This makes it possible to control the thickness of a gate insulating layer adjacent to a trench to a value equal to or greater than a value in the middle of an active region. Further, a corner adjacent to the trench is rounded to increase the voltage handling capability of device.
32 Citations
14 Claims
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1. A shallow trench isolation (STI) type semiconductor device employing a liner as an oxygen barrier, comprising:
-
a trench sidewall thermal oxide layer formed between the liner and a silicon substrate to a thickness of 20 Å
-140 Å
,wherein a top of the liner is located at a position where a level difference from the top of the liner to an upper surface of the substrate is 150 Å
or less. - View Dependent Claims (2, 3)
-
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4. A method of forming a shallow trench isolation (STI) type semiconductor device, comprising:
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etching a substrate where a pattern of an etch-stop layer covers an active region, forming a trench;
forming a thermal oxide layer on a sidewall of the trench;
isotropically etching the pattern and removing a lateral end of the pattern by a predetermined width, forming a shrunk pattern;
stacking a liner for an oxygen barrier on the thermal oxide layer of the substrate;
stacking a CVD silicon oxide layer on the substrate after the liner is formed, filling the trench;
removing and planarizing the CVD silicon oxide layer over the etch-stop layer;
removing the shrunk pattern; and
forming a gate oxide layer on the active region, wherein a thickness of the thermal oxide layer on the sidewall of the trench is controlled to be 20 Å
-140 Å
during the stacking of the liner. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification