Selective epitaxial germanium growth on silicon-trench fill and in situ doping
First Claim
1. A method of processing a patterned silicon substrate, comprising:
- depositing a germanium containing material in recesses of the patterned silicon substrate;
depositing an overburden of the germanium containing material of at least about 50% on the substrate; and
directing one or more laser pulses to the germanium containing material, wherein each laser pulse has energy sufficient to melt a portion of the overburden;
reflowing a surface of the germanium containing material to form a substantially flat surface; and
removing the overburden.
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Accused Products
Abstract
Methods and apparatus for forming a germanium containing film on a patterned substrate are described. The patterned substrate is a silicon, or silicon containing material, and may have a mask material formed on a surface thereof. The germanium containing material is formed selectively on exposed silicon in the recesses of the substrate, and an overburden of at least 50% is formed on the substrate. The germanium containing layer is thermally treated using pulsed laser radiation, which melts a portion of the overburden, but does not melt the germanium containing material in the recesses. The germanium containing material in the recesses is typically annealed, at least in part, by the thermal treatment. The overburden is then removed.
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Citations
15 Claims
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1. A method of processing a patterned silicon substrate, comprising:
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depositing a germanium containing material in recesses of the patterned silicon substrate; depositing an overburden of the germanium containing material of at least about 50% on the substrate; and directing one or more laser pulses to the germanium containing material, wherein each laser pulse has energy sufficient to melt a portion of the overburden; reflowing a surface of the germanium containing material to form a substantially flat surface; and removing the overburden. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of processing a patterned silicon substrate comprising recesses, comprising:
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growing a doped germanium material in the recesses by an epitaxial process; growing a film of the doped germanium material on the substrate to form an overburden of at least about 50%; reflowing portions of the doped germanium film by exposing the portions to pulsed laser energy; and removing the overburden. - View Dependent Claims (12, 13, 14, 15)
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Specification