Patent ID: 11946157
Assignee: ASM IP HOLDING B.V.
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 15:
16. A method for epitaxially growing a boron doped silicon germanium bilayer, the bilayer comprising a lowly doped layer and a highly doped layer, the method comprising:
providing a substrate comprising a monocrystalline surface in a reaction chamber;
epitaxially forming the lowly doped layer on the substrate; and
epitaxially forming the highly doped layer on the lowly doped layer,
wherein epitaxially forming the lowly doped layer comprises performing a plurality of deposition-etch cycles, a deposition-etch cycle comprising the steps of:
exposing the substrate to a first silicon precursor, a first germanium precursor, and a first boron precursor,
purging the reaction chamber, and
after purging the reaction chamber, introducing an etch gas into the reaction chamber;

wherein epitaxially forming the highly doped layer comprises exposing the substrate to a second silicon precursor, a second germanium precursor, and a second boron precursor;
wherein the substrate is maintained at a temperature of at most 450° C. while forming the lowly doped layer and while forming the highly doped layer; and
wherein at least one of the first silicon precursor and the second precursor comprises a halosilane.