Patent ID: 6784466
Filing Date: 2004-08-31
Classification: B82Y,H01L

Abstract:
A semiconductor structure comprising a single crystal semiconductor substrate, a Si1âˆ’xGex buffer layer graded from x=0 to y where y is in the range from 0.1 to 1.0, a layer of relaxed Si1âˆ’yGey having a thickness ranging from 0.25 &mgr;m to 10 &mgr;m, a quantum well layer, an undoped Si1âˆ’yGey spacer layer, and a doped Si1âˆ’yGey supply layer, wherein said layer of relaxed Si1âˆ’yGey functions as an absorbing region of a photodetector, said quantum well layer functions as a conducting channel of a field-effect transistor, and said spacer layer functions to separate dopants in said supply layer from said conducting channel.