Patent ID: 7105798

Claim:
A semiconductor light-receiving device comprising: a substrate that has a first surface and a second surface opposite to each other; a first semiconductor layer that is formed above the first surface of the substrate and includes at least one semiconductor layer portion of a first conductivity type; a light absorption layer that is formed above the first semiconductor layer and generates carriers in accordance with incident light; a second semiconductor layer that is formed above the light absorption layer and includes at least one semiconductor layer portion of a second conductivity type; a first electrode part that is electrically connected to the first semiconductor layer and applies a first potential thereto; a second electrode part that is electrically connected to the second semiconductor layer and applies a second potential thereto; a third semiconductor layer of the second conductivity type provided so that the substrate, the third semiconductor layer and the first semiconductor layer are arranged in this order; and a third electrode part that is electrically connected to the substrate and applies a third potential thereto, the first potential being higher than the third potential.