Single-crystal – oriented-crystal – and epitaxy growth processes; – Forming from vapor or gaseous state – With decomposition of a precursor
Reexamination Certificate
2006-11-28
2006-11-28
Hiteshew, Felisa (Department: 1722)
Single-crystal, oriented-crystal, and epitaxy growth processes;
Forming from vapor or gaseous state
With decomposition of a precursor
C117S084000, C117S089000, C117S092000
Reexamination Certificate
active
07141116
ABSTRACT:
Provided are improved methods for forming silicon films, particularly single-crystal silicon films from amorphous silicon films in which a single-crystal silicon substrate is prepared by removing any native oxide, typically using an aqueous HF solution, and placed in a reaction chamber. The substrate is then heated from about 350° C. to a first deposition temperature under a first ambient to induce single-crystal epitaxial silicon deposition primarily on exposed silicon surfaces. The substrate is then heated to a second deposition temperature under a second ambient that will maintain the single-crystal epitaxial silicon deposition on exposed single-crystal silicon while inducing amorphous epitaxial silicon deposition on insulating surfaces. The amorphous epitaxial silicon can then be converted to single-crystal silicon using a solid phase epitaxy process to form a thin, high quality silicon layer. The first and second ambients include at least one silicon source gas and may include a non-oxidizing carrier gas.
REFERENCES:
patent: 5495823 (1996-03-01), Kobayashi
patent: 1999-38114 (1999-06-01), None
patent: 10-2001-0037531 (2001-05-01), None
Lee Jong Wook
Park Jae Young
Shin Yu Gyun
Son Yong Hoon
Yeo Cha Dong
Harness Dickey & Pierce
Hiteshew Felisa
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