Fin deformation modulation
First Claim
1. An integrated circuit structure comprising:
- a semiconductor substrate;
a first Shallow Trench Isolation (STI) region extending into the semiconductor substrate, wherein the first STI region comprises a first dielectric region;
a second STI region extending into the semiconductor substrate, wherein the second STI region comprises;
a second dielectric region, wherein the first dielectric region and the second dielectric region are formed of a same dielectric material; and
a third dielectric region over a bottom portion of the second dielectric region; and
a gate stack comprising a gate dielectric and a gate electrode over the gate dielectric, wherein the gate stack comprises an edge overlapping a portion of the third dielectric region.
0 Assignments
0 Petitions
Accused Products
Abstract
A method includes forming a plurality of trenches extending from a top surface of a semiconductor substrate into the semiconductor substrate, with semiconductor strips formed between the plurality of trenches. The plurality of trenches includes a first trench and second trench wider than the first trench. A first dielectric material is filled in the plurality of trenches, wherein the first trench is substantially fully filled, and the second trench is filled partially. A second dielectric material is formed over the first dielectric material. The second dielectric material fills an upper portion of the second trench, and has a shrinkage rate different from the first shrinkage rate of the first dielectric material. A planarization is performed to remove excess second dielectric material. The remaining portions of the first dielectric material and the second dielectric material form a first and a second STI region in the first and the second trenches, respectively.
17 Citations
20 Claims
-
1. An integrated circuit structure comprising:
-
a semiconductor substrate; a first Shallow Trench Isolation (STI) region extending into the semiconductor substrate, wherein the first STI region comprises a first dielectric region; a second STI region extending into the semiconductor substrate, wherein the second STI region comprises; a second dielectric region, wherein the first dielectric region and the second dielectric region are formed of a same dielectric material; and a third dielectric region over a bottom portion of the second dielectric region; and a gate stack comprising a gate dielectric and a gate electrode over the gate dielectric, wherein the gate stack comprises an edge overlapping a portion of the third dielectric region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An integrated circuit structure comprising:
-
a semiconductor substrate; a semiconductor strip over a bulk portion of the semiconductor substrate; a first Shallow Trench Isolation (STI) region contacting a first sidewall of the semiconductor strip, wherein the first STI region comprises; a first liner dielectric; a first dielectric region over the first liner dielectric; and a second dielectric region over the first dielectric region; and a second STI region contacting a second sidewall of the semiconductor strip, with the first sidewall and the second sidewall being opposite sidewalls of the semiconductor strip, wherein the second STI region comprises; a second liner dielectric; and a third dielectric region over and contacting the second liner dielectric; and a first gate stack comprising a gate dielectric and a gate electrode overlying the gate dielectric, wherein the first gate stack comprises a portion over and in contact with the first dielectric region and a first portion of the second dielectric region, and wherein a second portion of the second dielectric region is un-overlapped by the first gate stack. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. An integrated circuit structure comprising:
-
a semiconductor substrate; a first Shallow Trench Isolation (STI) region extending into the semiconductor substrate, wherein all dielectric layers in the first STI region have a first total count; and a second STI region extending into the semiconductor substrate, wherein all dielectric layers in the second STI region have a second total count greater than the first total count; a semiconductor strip comprising; a first sidewall contacting a sidewall of the first STI region; and a second sidewall contacting a sidewall of the second STI region; a semiconductor fin overlapping the semiconductor strip, wherein the semiconductor fin is higher than top surfaces of the first STI region and the second STI region; and a gate dielectric on sidewalls and a top surface of the semiconductor fin, wherein the gate dielectric continuously extends from the sidewalls of the semiconductor fin to contact all dielectric layers in the second STI region, and the semiconductor fin and the gate dielectric are parts of a Fin Field-Effect Transistor (FinFET). - View Dependent Claims (17, 18, 19, 20)
-
Specification