Patent ID: 8685845

Claim:
An epitaxial deposition method comprising: depositing an n-type conductivity silicon doped with carbon (Si:C) monocrystalline semiconductor material on a semiconductor deposition surface using a deposition gas precursor comprising a silane containing gas prescursor, a carbon containing gas precursor, and an n-type gas dopant source, wherein the deposition gas precursor is introduced to the semiconductor deposition surface with a hydrogen (H 2 ) carrier gas, wherein the hydrogen (H 2 ) carrier gas is introduced to the semiconductor deposition surface at a flow rate ranging from 10 slm to 50 slm, wherein the n-type conductivity silicon doped with carbon (Si:C) monocrystalline semiconductor material has a stacking defect density that ranges from 10 12 defects/cm 3 to 10 14 defects/cm 3 ; etching epitaxial amorphous semiconductor material or epitaxial polysilicon selectively to the n-type conductivity silicon doped with carbon (Si:C) monocrystalline semiconductor material, wherein the etch reaction comprises hydrogen chloride (HCl) gas etchant, a pressure ranging from 250 Torr to 450 Torr, and a hydrogen (H 7 ) carrier gas, wherein the etch reaction comprises 80% hydrogen (H 2 ) carrier gas and 20% hydrogen chloride (HCl) gas etchant; measuring a thickness of the n-type conductivity silicon doped with carbon (Si:C) monocrystalline semiconductor material; and repeating steps of depositing the n-type conductivity silicon doped with carbon (Si:C) monocrystalline semiconductor material, the etching of the epitaxial amorphous semiconductor material or epitaxial polysilicon, and the measuring of the thickness of the n-type conductivity silicon doped with carbon (Si:C) until a measured thickness is equal to a predetermined thickness.