Diffuser plate with slit valve compensation
First Claim
Patent Images
1. A gas distribution plate assembly, comprising:
- a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve in a processing chamber, a center, and a second edge; and
a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise;
a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element;
a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and
a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes, wherein the third hollow cathode cavity volume is greater than the first hollow cathode cavity volume and the second hollow cathode cavity volume.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention generally comprises a diffuser plate for a PECVD chamber. The diffuser plate comprises a plurality of hollow cathode cavities. The edge of the diffuser plate that will reside closest to a slit valve within a processing chamber may have the shape and/or size of the hollow cathode cavities adjusted to compensate for the proximity to the slit valve. By adjusting the shape and/or size of the hollow cathode cavities closest to the slit valve, the diffuser plate may permit a uniform plasma distribution across the processing chamber and thus, a uniform film thickness upon a substrate during a PECVD process.
758 Citations
24 Claims
-
1. A gas distribution plate assembly, comprising:
-
a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve in a processing chamber, a center, and a second edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes, wherein the third hollow cathode cavity volume is greater than the first hollow cathode cavity volume and the second hollow cathode cavity volume. - View Dependent Claims (2, 3, 4)
-
-
5. A gas distribution plate assembly, comprising:
-
a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve in a processing chamber, a center, and a second edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes, wherein each choke has a length and a diameter sufficient to promote a substantially uniform back pressure, each choke is coupled with a hollow cathode cavity.
-
-
6. A plasma processing chamber, comprising:
-
a chamber body having a plurality of walls; one or more slit valves disposed in at least one of the plurality of walls; and a diffuser plate comprising; a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve of the one or more slit valves, a center, and a second edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes, wherein the third hollow cathode cavity volume is greater than the first hollow cathode cavity volume and the second hollow cathode cavity volume. - View Dependent Claims (7, 8, 9)
-
-
10. A plasma processing chamber, comprising:
-
a chamber body having a plurality of walls; one or more slit valves disposed in at least one of the plurality of walls; and a diffuser plate comprising; a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve of the one or more slit valves, a center, and a second edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes, wherein each choke has a length and a diameter sufficient to promote a substantially uniform back pressure, each choke is coupled with a hollow cathode cavity.
-
-
11. A gas distribution plate assembly, comprising:
-
a diffuser plate element having an upstream side, a downstream side, a first edge to be disposed adjacent a slit valve in a processing chamber, a center, and a second edge opposite the first edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A plasma processing chamber, comprising:
-
a chamber body having a plurality of walls; one or more slit valves disposed in at least one of the plurality of walls; and a diffuser plate comprising; a diffuser plate element having an upstream side, a downstream side, a first edge disposed adjacent a slit valve of the one or more slit valves, a center, and a second edge opposite the first edge; and a plurality of gas passages passing between the upstream side and the downstream side, each gas passage having a choke and a hollow cathode cavity with the chokes of the gas passages being substantially identical, the plurality of gas passages comprise; a first gas passage having a first hollow cathode cavity disposed adjacent the first edge of the diffuser plate element; a second gas passage having a second hollow cathode cavity disposed adjacent the center of the diffuser plate element; and a third gas passage having a third hollow cathode cavity disposed adjacent the second edge, wherein the first hollow cathode cavity, second hollow cathode cavity, and third hollow cathode cavity have different volumes. - View Dependent Claims (17, 18, 19, 20)
-
-
21. An apparatus, comprising:
a diffuser plate element having an upstream side, a downstream side, a plurality of passages extending therebetween, a first edge, and a second edge adjacent the first edge, each passage having a choke with the chokes of the gas passages being substantially identical, and each gas passage having a cone shaped portion extending from the downstream side towards the upstream side, wherein a cone shaped portion adjacent the first edge of the diffuser plate, a cone shaped portion adjacent the center of the diffuser plate, and a cone shaped portion adjacent the second edge of the diffuser plate have different volumes. - View Dependent Claims (22, 23, 24)
Specification