Patent ID: 7138289

Claim:
A method of fabricating a multilayer color sensing photodetector, comprising the steps of; forming a dielectric boundary in a semiconductor substrate to form a single crystalline region within the semiconductor substrate; depositing a blocking layer to a first surface of the semiconductor substrate to define an implant area around the single crystalline region; implanting ions into the implant area; annealing the semiconductor substrate to create a dielectric layer beneath the single crystalline region, the dielectric layer being in contact with the dielectric boundary; depositing a layer of semiconductor material on a first surface of at least the single crystalline region; forming a second dielectric boundary in the layer of semiconductor material to form a second single crystalline region within the layer of semiconductor material; depositing a blocking layer to a first surface of the layer of semiconductor material to pattern a second implant area around the second single crystalline region; implanting ions into the second implant area; annealing the semiconductor substrate to create a second dielectric layer beneath the second single crystalline region, the second dielectric layer being in contact with the second dielectric boundary; depositing a second layer of semiconductor material on a first surface of at least the second single crystalline region; forming a third dielectric boundary in the second layer of the semiconductor material to form a third single crystalline region within the second layer of the semiconductor material; depositing a second blocking layer to a first surface of the second layer of semiconductor material to pattern a third implant area; implanting ions into the third implant area; and annealing the second semiconductor layer to create a third dielectric layer beneath the third single crystalline region, the third dielectric layer being in contact with the third dielectric boundary.