Selective silicon growth for gapfill improvement
First Claim
1. A method for semiconductor process, the method comprising:
- forming fins on a substrate, sidewalls of the fins and a bottom surface defining a trench therebetween;
filling the trench with a gate layer comprising performing a cyclic deposition-treatment process on the substrate in a processing chamber, the cyclic deposition-treatment process comprising;
forming a first portion of the gate layer in the trench and along the sidewalls of the fins;
forming respective passivation layers on the first portion of the gate layer formed at respective top portions of the fins; and
forming a second portion of the gate layer on the first portion of the gate layer not covered by the passivation layer; and
after the trenches are filled with the gate layer, patterning the gate layer to form a gate structure over the fins.
1 Assignment
0 Petitions
Accused Products
Abstract
Embodiments disclosed herein relate generally to forming a gate layer in high aspect ratio trenches using a cyclic deposition-treatment process. In an embodiment, a method includes subjecting a substrate surface having at least one feature to a film deposition process to form a conformal film over a bottom surface and along sidewall surfaces of the feature, subjecting the substrate surface to a treatment process to form respective halogen surface layers or respective halogen-terminated layers on the conformal film formed at respective upper portions of the sidewall surfaces, and performing sequentially and repeatedly the film deposition process and the treatment process to fill the feature with the film.
-
Citations
20 Claims
-
1. A method for semiconductor process, the method comprising:
-
forming fins on a substrate, sidewalls of the fins and a bottom surface defining a trench therebetween; filling the trench with a gate layer comprising performing a cyclic deposition-treatment process on the substrate in a processing chamber, the cyclic deposition-treatment process comprising; forming a first portion of the gate layer in the trench and along the sidewalls of the fins; forming respective passivation layers on the first portion of the gate layer formed at respective top portions of the fins; and forming a second portion of the gate layer on the first portion of the gate layer not covered by the passivation layer; and after the trenches are filled with the gate layer, patterning the gate layer to form a gate structure over the fins. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for semiconductor process, the method comprising:
-
forming fins on a substrate, sidewalls of the fins and a bottom surface defining a trench therebetween; forming a dummy gate layer over the fins, comprising; introducing a deposition gas, in a first deposition process, into a processing chamber in which the substrate is disposed to form a first portion of the dummy gate layer in the trench and over the fins; after introducing the deposition gas in the first deposition process, introducing a treatment gas into the processing chamber at a temperature of 350°
C. or above to form respective passivation layers on the first portion of the dummy gate layer at respective top portions of the fins;after introducing the treatment gas, introducing the deposition gas, in a second deposition process, into the processing chamber to form a second portion of the dummy gate layer on the first portion of the dummy gate layer not covered by the respective passivation layers, the dummy gate layer formed at the respective top portions of the fins having a first thickness T1, and the dummy gate layer at a bottom of the trench having a second thickness T2; and after introducing the deposition gas in the second deposition process, switching the deposition gas to the treatment gas when the ratio of T1 to T2 reaches 30;
1 or above; andafter forming the dummy gate layer, patterning the dummy gate layer to form a gate structure over the fins. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A method for semiconductor process, the method comprising:
-
forming a first fin and a second fin on a substrate, a first sidewall of the first fin and a second sidewall of the second fin forming sidewalls of a trench; and performing a cyclic deposition-treatment process to form a layer in the trench, the cyclic deposition-treatment process comprising; forming a first portion of the layer along a bottom and the sidewalls of the trench, the layer extending over the first fin and the second fin; and forming a first passivation layer on the first portion of the layer on an upper surface of the first fin and the first portion of the layer on an upper surface of the second fin, wherein the first portion of the first layer along a bottom of the trench is free of the first passivation layer; and forming a second portion of the layer along the bottom and the sidewalls of the trench, the second portion of the layer extending over the first passivation layer. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification