Patent ID: 6893932

Claim:
A method of making a heterojunction bipolar transistor, comprising the steps of: providing an emitter/base layer having a generally flat base-surface; providing that said emitter/base layer includes an emitter portion selected from one or more of the group Si, SiGe, SiC, amorphous-Si, amorphous-SiC and diamond-like carbon, and a base portion selected from one or more of the group Si, Ge and SiGe; providing that said base portion includes a generally flat base surface; processing said base-surface to produce a base-surface that is compatible with direct-wafer-bonding; providing a collector layer; providing that said collector layer is selected from one or more of the group SiC, (4H, 6H, 15R, 3C . . . ); providing that said collector layer includes a generally-flat collector-surface; processing said collector-surface to produce a collector-surface that is compatible with direct-wafer-bonding; and direct-wafer-bonding said base-surface to said collector-surface.