Patent ID: 7714403
Filing Date: 2010-05-11
Classification: H01L

Abstract:
1. An image sensor using a back-illuminated photodiode, comprising: epi-layers formed on first and second wafers each having a specific type by doping impurities with low concentration; a potential barrier formed on a surface of the epi-layer of the first wafer; a back-illuminated photodiode formed on the epi-layer which is formed on a back side of the first wafer; the second wafer on which a logic circuit is formed; a metal bonding portion by which a metal wire connected to the back-illuminated photodiode formed on the first wafer is electrically connected to a metal wire connected to the logic circuit formed on the second wafer; a pad formed on the potential barrier of the first wafer and electrically connected to an external circuit of the image sensor; and a via formed through the epi-layer and a plug which fills the via so that the pad is electrically connected to the logic circuit of the second wafer.