Trench poly ESD formation for trench MOS and SGT
First Claim
1. A method for fabricating a semiconductor device, comprising:
- a) forming a trench in a semiconductor substrate;
b) partially filling said trench with a semiconductor material, such that the semiconductor material lines a bottom and sides of the trench, while leaving a gap in a middle of the trench running lengthwise along the trench;
c) doping a first portion of the semiconductor material located below the gap with dopants of a first conductivity type;
d) filling the gap with a dielectric material;
e) doping second portions of the semiconductor material located on the sides of the trench on both sides of the dielectric material with dopants of a second conductivity type, whereby the doping forms a P-N-P or N-P-N structure running lengthwise along the trench with differently doped regions located side by side across a width of the trench.
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Abstract
A semiconductor device and its method of fabrication are described. A trench formed in a semiconductor substrate is partially filling said trench with a semiconductor material that lines a bottom and sides of the trench, leaving a gap in a middle of the trench running lengthwise along the trench. A first portion of the semiconductor material located below the gap is doped with dopants of a first conductivity type. The gap is filled with a dielectric material. Second portions of the semiconductor material located on the sides of the trench on both sides of the dielectric material are doped with dopants of a second conductivity type. The doping forms a P-N-P or N-P-N structure running lengthwise along the trench with differently doped regions located side by side across a width of the trench.
20 Citations
19 Claims
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1. A method for fabricating a semiconductor device, comprising:
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a) forming a trench in a semiconductor substrate; b) partially filling said trench with a semiconductor material, such that the semiconductor material lines a bottom and sides of the trench, while leaving a gap in a middle of the trench running lengthwise along the trench; c) doping a first portion of the semiconductor material located below the gap with dopants of a first conductivity type; d) filling the gap with a dielectric material; e) doping second portions of the semiconductor material located on the sides of the trench on both sides of the dielectric material with dopants of a second conductivity type, whereby the doping forms a P-N-P or N-P-N structure running lengthwise along the trench with differently doped regions located side by side across a width of the trench. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A semiconductor device, comprising:
a semiconductor material disposed in a trench, with poly lining at least the bottom of the trench, wherein the semiconductor material includes differently doped regions configured as a PNP or NPN structure formed in the trench with differently doped regions located side by side across a width of the trench, wherein the PNP or NPN structure includes first doped semiconductor regions along sidewalls of the trench and an oppositely-doped second semiconductor region located between the first semiconductor regions with a dielectric material filling a gap between the first semiconductor regions and above the second semiconductor region. - View Dependent Claims (15, 16, 17, 18, 19)
Specification