Patent ID: 7276770
Filing Date: 2007-10-02
Classification: H01L

Abstract:
1. A photodiode comprising: an active volume of silicon of a first conductivity type having a top surface, a bottom surface and side surfaces; a first silicon layer on the bottom surface of the active volume of silicon, the first silicon layer being of the first conductivity type and more highly doped than the active volume; a first silicon oxide layer over the first silicon layer and the bottom and sides of the active volume of silicon; a second silicon layer of a second conductivity type on most of the top surface of the active volume of silicon and not touching the first silicon layer; a first metal region in electrical contact with the first silicon layer; and, a second metal region in electrical contact with the second silicon layer; at least a first side surface of the active volume being inclined to provide substantially total reflection of light from the silicon-silicon oxide interfaces for light entering the active volume perpendicular through the first surface of the active volume over the inclined surface.