High rate selective polymer growth on a substrate
View Patent ↗Method and systems provide growth of polymer structures at a high rate in a selective manner. In various embodiments, the method or system can expose the growth site to a polymer source and growing a polymer tube at a rate of at least 80 micrometer per hour at the growth site. The method or system can provide selectivity by providing a growth site on a substrate by patterning a metal, such as copper, that provides a seed site for the polymer. Non-selected sites can be coated with a polymer growth inhibitor, such as polyimide or silicon nitride.
1. A method, comprising:
providing a growth site on a substrate;
exposing the growth site to a polymer source; and
growing a polymer tube at a rate of at least 80 micrometer per hour at the growth site.
2. The method of claim 1 , wherein growing a polymer tube includes growing polymer tubes with a diameter of less than one micrometer.
3. The method of claim 1 , wherein growing a polymer tube includes controlling the length of the polymer tube by controlling exposure time to the polymer source.
4. The method of claim 1 , wherein growing a polymer tube includes growing polymer tubes with a diameter at a nanometer scale.
5. The method of claim 1 , wherein providing a growth site includes patterning copper on a solid semiconductor substrate.
6. The method of claim 5 , wherein patterning copper includes uniformly coating a silicon wafer with a copper layer and forming a pattern layer to expose select portions of the copper layer.
7. The method of claim 6 , wherein forming a pattern layer includes patterning using at least one of lithography and etching.
8. The method of claim 7 , wherein forming a pattern layer includes forming a pattern layer of at least one of polyimide and silicon-nitride.
9. A method comprising:
exposing a growth site to a polymer source at a temperature of less than 50 degrees Celsius; and
growing a vertical polymer structure at a rate of at least 80 micrometer per hour at the growth site.
10. The method of claim 9 , wherein growing a vertical polymer structure includes growing a polymer structure with a width of less than one micrometer.
11. The method of claim 9 , wherein growing a vertical polymer structure includes controlling the length of the polymer tube by controlling exposure time to the polymer source.
12. The method of claim 9 , wherein growing a vertical polymer structure includes growing a polymer tube with a diameter at a nanometer scale.
13. The method of claim 9 , wherein exposing a growth site includes:
patterning copper on a solid semiconductor substrate; and
selectively exposing the copper to create growth sites.
14. The method of claim 13 , wherein selectively exposing includes selectively coating the copper with at least one of polyimide and silicon-nitride.
15. The method of claim 9 , wherein growing a vertical polymer structure includes controlling density of the polymer by controlling volume of a reactive species of the polymer.