Patent ID: 7199412
Filing Date: 2007-04-03
Classification: H01L

Abstract:
1. An image sensor comprising a plurality of sensor portions arranged on a semiconductor substrate, the sensor portions each comprising: a sensor surface; a first region of a first conductivity type defined in the semiconductor substrate; a second region of a second conductivity type formed on the first region by epitaxial growth, the second conductivity type being different from the first conductivity type; a third region of the first conductivity type formed on the second region by epitaxial growth; wherein the sensor surface, except for a center portion of the sensor surface, includes the third region; and a fourth region of the first conductivity type, comprised by the third region in a sensor surface portion of the third region, and having a higher impurity concentration than the other portion of the third region, the fourth region being provided in a surface portion of the third region corresponding to a region for receiving light in the image sensor; the sensor portions each including a first photodiode constituted by the first region and the second region and a second photodiode constituted by the second region and the third region.