Patent ID: 10573675

Abstract:
Photodetectors and methods for dual band photo detection are disclosed. The photodetector includes a stack of semiconductor layers defining first and second unipolar photosensitive modules (UPMs) of respectively opposite doping polarities, and a contact layer including at least one of metal and semiconductor materials having doping polarity opposite to that of the second UPM. The first and second UPMs are adapted for sensing radiation of different respective first and second wavelengths ranges. The second UPM is located upon the first UPM thereby forming a first diode junction between the first and second UPMs. The contact layer is located on the second UPM thereby forming a second diode junction between the second UPM and the contact layer. The first and second diode junctions are configured to have respectively opposite conduction directions, enabling selective sensing of electrical signals associated with the first and second wavelengths ranges.