Patent ID: 11859310
Assignee: AZUR SPACE SOLAR POWER GMBH
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A vapor phase epitaxy method comprising:
growing a III-V layer with a doping that changes from a first conductivity type to a second conductivity type in a reaction chamber from the vapor phase from an epitaxial gas flow comprising a carrier gas, at least one first precursor for an element from main group III, and at least one second precursor for an element from main group V, wherein the first conductivity type is p and the second conductivity type is n;
during said growing the III-V layer, setting, when a first growth height is reached, a first initial doping level of the first conductivity type via a ratio of a first mass flow of the first precursor to a second mass flow of the second precursor in the epitaxial gas flow and with or without the addition of a further precursor for a dopant of the first conductivity type to the epitaxial gas flow;
after said growth height is reached, reducing the first initial doping level to a second initial doping level of the first conductivity type or set to a second initial doping level of the second conductivity type of at most 1·1015 cm−3 by adding a third mass flow of a third precursor for a dopant of the second conductivity type to the epitaxial gas flow and/or by changing the ratio of the first mass flow to the second mass flow; and
after said setting the second initial doping level of the first conductivity type or the second initial doping level of the second conductivity type, increasing, stepwise or continuously, the mass flow of the third precursor and/or by changing, stepwise or continuously, the ratio between the first mass flow and the second mass flow, a doping of the III-V layer over a junction region layer with a growth height of at least 10 μm is changed stepwise or continuously until a target doping level of the second conductivity type is reached.