Patent ID: 8871600

Claim:
A method of fabricating a device structure using a first device region and a second device region comprised of a first semiconductor material of a substrate, the method comprising: forming a cathode of a Schottky barrier diode in the first semiconductor material of the first device region; patterning a hardmask layer to form a first opening registered with the first device region and a second opening registered with the second device region; forming a guard ring for the Schottky barrier diode inside the first opening in the hardmask layer and in direct contact with a first portion of the top surface of the first device region using a selective epitaxial growth process so that a second semiconductor material of the guard ring has an epitaxial relationship with the first semiconductor material in the first device region; concurrently forming an extrinsic base of a vertical bipolar junction transistor inside the second opening in the hardmask layer when the guard ring is formed, wherein the extrinsic base is comprised of the second semiconductor material in an epitaxial relationship with the first semiconductor material of the second device region; and forming an anode of the Schottky barrier diode in a contacting relationship with a second portion of the top surface of the first device region, wherein a Schottky junction is defined between the anode and the cathode.