Deposition from liquid sources
View Patent ↗A liquid injector is used to vaporize and inject a silicon precursor into a process chamber to form silicon-containing layers during a semiconductor fabrication process. The injector is connected to a source of silicon precursor, which preferably comprises liquid trisilane in a mixture with one or more dopant precursors. The mixture is metered as a liquid and delivered to the injector, where it is then vaporized and injected into the process chamber.
1. A method for semiconductor fabrication, comprising:
metering a precursor liquid comprising trisilane as a liquid;
vaporizing the precursor liquid after metering; and
injecting the vaporized precursor liquid into the process chamber, wherein the precursor liquid comprises trislane and at least one additional precurser.
2. The method of claim 1 , wherein the at least one additional precursor has a boiling point within about 60° C. of a boiling point of trisilane under process conditions.
3. The method of claim 1 , wherein the at least one additional precursor comprises an electrical dopant precursor.
4. The method of claim 3 , wherein the dopant precursor comprises one or more compounds chosen form the group consisting of phosphorus tribromide and phosphorous trichloride.
5. The method of claim 3 , wherein the dopant has the chemical formula (H 3 Si) 3-x MH x , where x=1-3 and M=As, P or B.
6. A method for semiconductor fabrication, comprising:
metering a precursor liquid comprising trisilane as a liquid:
vaporizing the precursor liquid after metering: and
injecting the vaporized precursor liquid into the process chamber, wherein injecting comprises exposing a substrate in the process chamber to the vaporized precursor liquid to deposit a silicon-containing film, and wherein the silicon-containing film has a thickness non-uniformity of about 10% or less.
7. The method of claim 6 , wherein the silicon-containing film has a thickness non-uniformity of about 5% or less.
8. A method for semiconductor fabrication, comprising:
metering a precursor liquid comprising trisilane as a liquid;
vaporizing the precursor liquid after metering; and
injecting the vaporized precursor liquid into the process chamber, wherein injecting comprises exposing a substrate in the process chamber to the vaporized precursor liquid to deposit a silicon-containing film, and wherein the silicon-containing film has a step coverage of about 70% or greater.
9. The method of claim 8 , wherein the silicon-containing film has a step coverage of about 90% or greater.
10. A method for semiconductor fabrication, comprising:
metering a precursor liquid comprising trisilane as a liquid;
vaporizing the precursor liciuid after metering; and
injecting the vaporized precursor liquid into the process chamber, wherein injecting comprises exposing a substrate in the process chamber to the vaporized precursor liquid to deposit a silicon-containing film, and wherein the silicon-containing film has a surface roughness greater than a substrate surface roughness by about 10 Å or less.
11. The method of claim 10 , wherein the silicon-containing film has a surface roughness greater than a substrate surface roughness by about 5 Å or less.
12. A method for semiconductor fabrication, comprising:
metering a precursor liquid comprising trisilane as a liquid;
vaporizing the precursor liquid after metering; and
injecting the vaporized precursor liquid into the process chamber, wherein the process chamber is a laminar flow single substrate process chamber.
13. The method of claim 12 , wherein injecting the vaporized precursor liquid comprises depositing a layer of a silicon compound.
14. The method of claim 13 , wherein the silicon compound comprises SiGe, SiGeC, SiN, SiC or SiSnC.
15. The method of claim 14 , wherein the precursor liquid comprises one or more precursors chosen from the group consisting of compounds having the chemical formulas SiH 3 (4-x)GeH x , where x is 0-3, SiH 3 (4-x)CH x , where x is 0 or 1, and SiH 3 (4-x)NH x-1 , where x is 1.
16. The method of claim 12 , wherein the precursor liquid consists of trisilane.
17. The method of claim 16 , further comprising separately metering a second precursor liquid comprising an electrical dopant precursor as a liquid and vaporizing the second precursor liquid with the precursor liquid.
18. The method of claim 12 , wherein vaporizing the precursor liquid comprises atomizing the liquid precursor and exposing the precursor liquid to a pre-heated carrier gas.
19. The method of claim 18 , wherein vaporizing the precursor liquid comprises flowing liquid silicon precursor through a liquid injector and contacting the liquid precursor with a heated surface of the injector.