Patent ID: 7768046
Filing Date: 2010-08-03
Classification: H01L,Y02E

Abstract:
1. An image sensor, comprising: a semiconductor substrate of a first conductivity type having a photo-detecting surface; a semiconductor region of a second conductivity type disposed under the photo-detecting surface and forming a junction surface with the semiconductor substrate; and a dielectric body provided in the semiconductor substrate beneath the junction surface so that a width of the dielectric body in a direction parallel to the photo-detecting surface does not extend beyond a width of the semiconductor region in the direction parallel to the photo-detecting surface, the dielectric body being polarized due to charges forming a depletion region generated by the semiconductor substrate and the semiconductor region, the depletion region being formed over the entire junction surface of the semiconductor region and the semiconductor substrate so as to enclose the semiconductor region except at a portion of the photo-detecting surface, and the width of the dielectric body being approximately equal to a width of an inner surface of the depletion region and smaller than a width of an outer surface of the depletion region in the direction parallel to the photo-detecting surface of the semiconductor substrate.