Non-elastomeric, non-polymeric, non-metallic membrane valves for semiconductor processing equipment
Non-elastomeric, non-polymeric, non-metallic membrane valves for use in high-vacuum applications are disclosed. Such valves are functional even when the fluid-control side of the valve is exposed to a sub-atmospheric pressure field which may generally act to collapse/seal traditional elastomeric membrane valves.
1. An apparatus comprising:
a substrate having one or more microfluidic valve structures, each microfluidic valve structure of the one or more microfluidic valve structures including:
a diaphragm having a first side, and a second side opposite the first side;
a base;
an orifice in the base; and
a raised seat structure, wherein, for each microfluidic valve structure:
the diaphragm is made from a non-elastomeric material,
the raised seat structure extends from the base towards the first side of the diaphragm,
a surface of the raised seat structure facing the diaphragm is separated from the first side of the diaphragm by a gap when the microfluidic valve structure is in an undeformed state, and
the diaphragm, the raised seat structure, and the gap of that microfluidic valve structure are sized such that, when that microfluidic valve structure is transitioned to an actuated state by pressurizing the second side of the diaphragm to a first pressure,
a portion of the diaphragm is caused to elastically deform towards, and seal against, the raised seat structure.
2. The apparatus of claim 1 , wherein the diaphragm is made of a non-polymeric, non-elastomeric material.
3. The apparatus of claim 2 , wherein the raised seat structure and the base are also made of non-polymeric, non-elastomeric material or materials.
4. The apparatus of claim 1 , wherein the diaphragm is made of a non-metallic, non-elastomeric material.
5. The apparatus of claim 4 , wherein the raised seat structure and the base are also made of non-metallic, non-elastomeric material or materials.
6. The apparatus of claim 1 , wherein the diaphragm is made of a non-polymeric, non-metallic, non-elastomeric material.
7. The apparatus of claim 6 , wherein the raised seat structure and the base are also made of non-polymeric, non-metallic, non-elastomeric material or materials.
8. The apparatus of claim 6 , wherein the non-polymeric, non-metallic, non-elastomeric material comprises silicon.
9. The apparatus of claim 6 , wherein the non-polymeric, non-metallic, non-elastomeric material comprises silicon dioxide.
10. The apparatus of claim 1 , wherein:
the substrate includes a first inlet passage and a first outlet passage,
the one or more microfluidic valve structures includes a first set of microfluidic valve structures,
each microfluidic valve structure in the first set of microfluidic valve structures is fluidically interposed between the first inlet passage and the first outlet passage, and
the orifice in each microfluidic valve structure in the first set of microfluidic valve structures is fluidically interposed between the first inlet passage and the diaphragm of that microfluidic valve structure.
11. The apparatus of claim 10 , wherein each microfluidic valve structure in the first set of microfluidic valve structures is independently actuatable from each other microfluidic valve structure in the first set of microfluidic valve structures.
12. The apparatus of claim 10 , wherein:
the substrate further includes one or more additional inlet passages,
the substrate further includes a corresponding additional outlet passage for each additional inlet passage,
the one or more microfluidic valve structures includes a corresponding set of microfluidic valve structures for each additional inlet passage,
each microfluidic valve structure in each set of microfluidic valve structures corresponding to one of the one or more additional inlet passages is fluidically interposed between that additional inlet passage and the corresponding outlet passage, and
the orifice in each microfluidic valve structure in each set of microfluidic valve structures corresponding to one of the one or more additional inlet passages is fluidically interposed between that additional inlet passage and the diaphragm of that microfluidic valve structure.
13. The apparatus of claim 12 , wherein each microfluidic valve structure in the corresponding set of microfluidic valve structures for each additional inlet passage is independently actuatable relative to each other microfluidic valve structure in the corresponding set of microfluidic valve structures for that additional inlet passage.
14. The apparatus of claim 12 , wherein:
the first outlet passage and each additional outlet passage branch off of a common outlet passage,
the first outlet passage is fluidically interposed between the common outlet passage and the microfluidic valve structures in the first set of microfluidic valve structures, and
each additional outlet passage is fluidically interposed between the common outlet passage and the microfluidic valve structures in the set of microfluidic valve structures corresponding to the additional inlet passage that corresponds to that additional outlet passage.
15. The apparatus of claim 10 , wherein:
the substrate includes a second inlet passage,
the one or more microfluidic valve structures includes a second set of microfluidic valve structures,
each microfluidic valve structure in the second set of microfluidic valve structures is fluidically interposed between the second inlet passage and the first outlet passage, and the orifice in each microfluidic valve structure in the second set of microfluidic valve structures is fluidically interposed between the second inlet passage and the diaphragm of that microfluidic valve structure.
16. The apparatus of claim 15 , wherein:
each microfluidic valve structure in the first set of microfluidic valve structures is independently actuatable from each other microfluidic valve structure in the first set of microfluidic valve structures, and
each microfluidic valve structure in the second set of microfluidic valve structures is independently actuatable from each other microfluidic valve structure in the second set of microfluidic valve structures.
17. The apparatus of claim 1 , further comprising:
a diaphragm layer;
an actuator plenum layer; and
a valve plenum layer, wherein:
the diaphragm of a first microfluidic valve structure of the one or more microfluidic valve structures is provided by the diaphragm layer,
a first side of the diaphragm layer provides the first side of the diaphragm of the first microfluidic valve structure,
a second side of the diaphragm layer provides the second side of the diaphragm of the first microfluidic valve structure,
the first side of the diaphragm layer is bonded to the valve plenum layer,
the second side of the diaphragm layer is bonded to the actuator plenum layer,
the actuator plenum layer has a hole through it that is centered on the diaphragm of the first microfluidic valve structure, and
the valve plenum layer has a hole through it that is also centered on the diaphragm of the first microfluidic valve structure.
18. The apparatus of claim 1 , further comprising a showerhead with a plurality of gas distribution ports distributed across an underside thereof, wherein at least one of the one or more microfluidic valve structures is configured to control flow of gas through a corresponding one of the gas distribution ports and is positioned within the showerhead.
19. The apparatus of claim 18 , further comprising a processing chamber, wherein the underside of the showerhead is configured to distribute gas flowed through the gas distribution ports into the processing chamber.
20. The apparatus of claim 1 , wherein the apparatus is configured to be connected to a gas supply such that at least a first microfluidic valve structure of the one or more microfluidic valve structures is part of a flow path within the apparatus that is configured to be fluidically connectable with the gas supply such that the raised seat structure for the first microfluidic valve structure is fluidically interposed between the gas supply and the diaphragm for the first microfluidic valve structure.