Silane compositions, methods of making the same, method for forming a semiconducting and/or silicon-containing film, and thin film structures formed therefrom
View Patent ↗A method of making hydrogenated Group IVA compounds having reduced metal-based impurities, compositions and inks including such Group IVA compounds, and methods for forming a semiconductor thin film. Thin semiconducting films prepared according to the present invention generally exhibit improved conductivity, film morphology and/or carrier mobility relative to an otherwise identical structure made by an identical process, but without the washing step. In addition, the properties of the present thin film are generally more predictable than those of films produced from similarly prepared (cyclo)silanes that have not been washed according to the present invention. The present invention advantageously provides semiconducting thin film structures having qualities suitable for use in electronics applications, such as display devices or RF ID tags, while enabling high-throughput manufacturing processes that form such thin films in seconds or minutes, rather than hours or days as with conventional photolithographic processes.
1. A method of removing metal contaminants from a silane composition, comprising:
a) washing a metal-contaminated composition consisting essentially of (i) Si and/or Ge atoms and (ii) hydrogen atoms with a washing composition comprising deionized water or an immiscible polar solvent to decontaminate the metal-contaminated composition; and
b) drying or removing the immiscible polar solvent from the decontaminated silane composition.
2. The method of claim 1 , further comprising distilling the metal-contaminated composition or the decontaminated silane composition.
3. The method of claim 1 , wherein the washing composition comprises deionized water, and the method comprises washing the metal-contaminated composition with the washing composition sufficiently to remove a substantial amount of water-soluble metal contaminants.
4. The method of claim 1 , wherein the decontaminated silane composition comprises less than 100 parts of a water-soluble metal impurity per million atoms of Si or Ge atoms in the silane composition.
5. The method of claim 4 , wherein the decontaminated silane composition comprises less than 10 parts of a water-soluble metal impurity per million atoms of Si or Ge atoms in the silane composition.
6. A composition, comprising:
a) a silane consisting essentially of (i) Si and/or Ge atoms and (ii) hydrogen atoms; and
b) less than 100 parts of aluminum per million atoms of Si or Ge.
7. A method of making a silicon-containing thin film, comprising:
a) depositing a layer of an ink onto a substrate, the ink comprising:
i) composition of claim 6 ; and
ii) a solvent in which the composition is soluble; and
b) curing the ink to form the silicon-containing thin film.
8. The method of claim 7 , wherein depositing comprises spin coating, dip coating, spray coating, inkjetting, slit coating, meniscus coating or microspotting the ink on the substrate.
9. The method of claim 7 , further comprising patterning the silicon-containing thin film.
10. An ink for making a semiconductor film, comprising:
a) composition of claim 6 ; and
b) a solvent in which the composition is soluble.
11. A method of making a silicon-containing film, comprising:
a) depositing a layer of an ink onto a substrate, the ink comprising:
i) a silane consisting essentially of (i) Si and/or Ge atoms and (ii) hydrogen atoms; and
ii) a solvent in which the silane is soluble; and
b) curing the ink to form the silicon-containing film having less than 100 parts of a water soluble metal impurity per million atoms of Si or Ge in the film.
12. The method of claim 11 , wherein the water soluble metal impurity comprises aluminum, lithium, sodium, potassium, rubidium, or cesium.
13. The method of claim 11 , wherein the silicon-containing film contains less than 10 parts water soluble metal impurity per million atoms of Si or Ge.
14. The method of claim 11 , wherein the silane has less than 100 parts water-soluble metal impurity per million atoms of Si or Ge.
15. A composition, comprising:
a) a silane consisting essentially of (i) Si and/or Ge atoms and (ii) hydrogen atoms; and
b) less than 100 parts of a water-soluble metal impurity per million atoms of Si or Ge.
16. The composition of claim 15 , wherein the water-soluble metal impurity comprises aluminum, lithium, sodium, potassium, rubidium, or cesium.
17. An ink for making a silicon-containing film, comprising:
a) the composition of claim 15 ; and
b) a solvent in which the composition is soluble.
18. A method of making a silicon-containing thin film, comprising:
a) depositing a layer of an ink onto a substrate, the ink comprising:
i) the composition of claim 15 ; and
ii) a solvent in which the composition is soluble; and
b) curing the ink to form the silicon-containing thin film having less than 100 parts of water-soluble metal impurity per million atoms of Si or Ge in the film.
19. The method of making a silicon-containing film of claim 18 , wherein the thin film contains less than 10 parts water-soluble metal impurity per million atoms of Si or Ge.
20. A thin film structure comprising a cured, at least partially hydrogenated, at least partially amorphous Group IVA element, the Group IVA element consisting essentially of at least one of Si and Ge, the thin film having less than 100 parts of a water-soluble metal impurity per million atoms of Si and Ge.
21. The thin film structure of claim 20 , having less than 10 ppm of water-soluble metal impurities per million atoms of Si and Ge.
22. The thin film structure of claim 20 , having less than 1 ppm of water-soluble metal impurities per million atoms of Si and Ge.
23. The thin film structure of claim 20 , wherein the water-soluble metal impurity comprises aluminum, lithium, sodium, potassium, rubidium, or cesium.