Recursive inject apparatus for improved distribution of gas
Apparatus and methods for processing a substrate including an injector unit insert with a plurality of flow paths leading to a first plenum, each of the flow paths providing one or more of substantially the same residence time, length and/or conductance. Injector units including the injector unit inserts have increased flow uniformity.
1. An injector unit insert, comprising:
a first insert component having a gas inlet line;
a second insert component including a channel sized to hold the first insert component in an upper portion of the channel and maintain a flow path in a lower portion of the channel, the channel forming a flow path in a first arm in fluid communication with the gas inlet line, the first arm splitting a gas flow into two flow paths in two first legs, each first leg splitting at a second arm into two flow paths, each end of the second arms having a hole extending through the second insert component; and
a third insert component having a top surface and a bottom surface, the top surface including a plurality of recesses so that when a bottom surface of the second insert component is against the top surface of the third insert component, the plurality of recesses form a plurality of channels, each of the plurality of channels aligned to form fluid communication with a gas flowing through the holes in the second insert component.
2. The injector unit insert of claim 1 , wherein each channel in the third insert component comprises a third arm in fluid communication with the hole in the second insert component, each third arm splitting a flow path into two third legs on either end of the third arm.
3. The injector unit insert of claim 2 , wherein each third leg connects to and is in fluid communication with a fourth arm, and each fourth arm splits a flow path into two fourth legs.
4. The injector unit insert of claim 3 , wherein each fourth leg extends through a thickness of the third insert component and forms an opening in the bottom surface of the third insert component.
5. The injector unit insert of claim 4 , wherein each opening in the third insert component is in fluid communication with the gas line inlet and forms a flow path, each flow path has substantially the same residence time.
6. The injector unit insert of claim 4 , wherein each opening in the third insert component is in fluid communication with the gas line inlet and forms a flow path, each flow path has substantially the same length.
7. The injector unit insert of claim 4 , wherein each opening in the third insert component is in fluid communication with the gas line inlet and forms a flow path, each flow path has substantially the same conductance.
8. The injector unit insert of claim 1 , wherein each junction between a leg and arm occurs at a substantially right angle.
9. The injector unit insert of claim 1 , wherein the gas inlet line forms 16 outlets in the bottom surface of the third insert component.
10. The injector unit insert of claim 1 , wherein each first leg connects to a center of each second arm.
11. The injector unit insert of claim 1 , wherein openings in the bottom surface of the third insert component are substantially equidistant.
12. The injector unit insert of claim 1 , wherein openings in the bottom surface of the third insert component are aligned along a center line of the bottom surface.
13. An injector unit comprising:
an injector body having a back face and front surface;
an injector unit insert according to claim 1 positioned in the injector body;
a first plenum adjacent a bottom face of the injector unit insert; and
a plurality of plenum channels extending from the first plenum toward the front surface of the injector body, the plurality of channels in fluid communication with the first plenum; and
a gas port in the front surface of the injector body, the gas port in fluid communication with the plurality of channels.
14. The injector unit of claim 13 , further comprising a showerhead positioned within the gas port and in fluid communication with the plurality of plenum channels.
15. The injector unit of claim 14 , further comprising a second plenum between the plurality of plenum channels and the showerhead.
16. The injector unit of claim 14 , wherein the injector unit is wedge shaped.