Patent ID: 7230289
Filing Date: 2007-06-12
Classification: H01L

Abstract:
1. A solid-state imaging device in which a second semiconductor layer of opposite conductive type is formed on a first semiconductor layer of one conductive type, the solid-state imaging device being equipped with plural unit pixels formed on the second semiconductor layer, each of the unit pixels comprising: a photo-diode for generating charges by light illumination, the photo-diode comprising one conductive impurity layer provided in the surface of the second semiconductor layer; and a photo-detecting transistor coupled to the photo-diode, the photo-detecting transistor comprising: a gate electrode formed on the second semiconductor layer via an insulation film; a source region and drain region that are one conductive type and formed in the surface of the second semiconductor layer, the drain region and the impurity layer being connected to each other; channel dope layer of one conductive type provided in the area between the source and drain regions in the surface of the second semiconductor layer; and high impurity density region of opposite conductive type formed in the semiconductor layer below the channel dope layer, the high impurity density region being formed by self-alignment to the gate electrode, the photo-detecting transistor generating a signal potential that changes in accordance with the amount of the charges in the high impurity density region.