Boron ion implantation using alternative fluorinated boron precursors, and formation of large boron hydrides for implantation
View Patent ↗Methods of implanting boron-containing ions using fluorinated boron-containing dopant species that are more readily cleaved than boron trifluoride. A method of manufacturing a semiconductor device including implanting boron-containing ions using fluorinated boron-containing dopant species that are more readily cleaved than boron trifluoride. Also disclosed are a system for supplying a boron hydride precursor, and methods of forming a boron hydride precursor and methods for supplying a boron hydride precursor. In one implementation of the invention, the boron hydride precursors are generated for cluster boron implantation, for manufacturing semiconductor products such as integrated circuitry.
1. A method of implanting boron-containing ions, comprising:
ionizing a gas-phase boron-containing compound using an ionization apparatus to generate an ion beam of boron-containing ions; and
accelerating the boron-containing ions by electric field to implant boron-containing ions into a substrate,
wherein the boron-containing compound comprises B 2 F 4 .
2. The method of claim 1 , further comprising annealing the substrate subsequent to implanting the boron-containing-ions into the substrate.
3. The method of claim 1 , wherein said ionizing is carried out in a vacuum chamber.
4. The method of claim 1 , wherein at least 15% of the boron-containing compound is ionized in said ionizing.
5. The method of claim 4 , wherein said ionizing is carried out at arc voltage of less than 100 volts.
6. The method of claim 4 , wherein said ionizing is carried out at arc voltage of less than 90 volts.
7. The method of claim 4 , wherein said ionizing is carried out at arc voltage of less than 80 volts.
8. The method of claim 4 , wherein said ionizing is carried out at arc voltage of less than 70 volts.
9. The method of claim 1 , wherein said boron-containing compound is mixed with a noble gas for the ionizing
10. The method of claim 9 , wherein said noble gas is selected from the group consisting of neon and argon.
11. The method of claim 9 , wherein said noble gas is selected from the group consisting of krypton and xenon.
12. The method of claim 1 , wherein said boron-containing compound further comprises BF 3 .
13. The method of claim 1 , wherein said substrate comprises an article selected from the group consisting of semiconductor substrates, substrates for flat panel displays, and substrates for microelectromechanical systems (MEMS).
14. The method of claim 1 , wherein said ionizing is carried out using an ion source.
15. The method of claim 14 , wherein said ion source comprises an ion source selected from the group consisting of ion sources of types using thermoelectrodes and powered by an electric arc, microwave types of ion sources using a magnetron, indirectly heated cathode sources, and RF plasma sources.
16. The method of claim 1 , wherein said boron-containing compound is contained in a vessel in a gas box joined by a transfer line to a semiconductor tool in which the boron-containing ions are implanted into the substrate.
17. The method of claim 16 , wherein the transfer line contains a mass or pressure controller therein to modulate flow of the boron-containing compound to the semiconductor tool.
18. A method of implanting boron-containing ions, comprising:
ionizing B 2 F 4 using an ionization apparatus including an extraction electrode to produce a collimated ion beam of boron-containing ions; and
accelerating the boron-containing ions by electric field to implant boron-containing ions into a substrate.