Light receiving device and method of producing light receiving device

A light receiving device comprising:

• a substrate having a principal surface and a back surface opposite to the principal surface, the back surface including a light receiving surface;
• a metal wire disposed on the principal surface of the substrate, the metal wire including a bonding portion having an opening;
• and
• a plurality of photodiodes that is arranged in an array on the substrate, each of the photodiodes including an electrode connected to the bonding portion of the metal wire and a semiconductor mesa including a stacked semiconductor layer, the stacked semiconductor layer including a first semiconductor layer disposed on the substrate, an optical absorption layer disposed on the first semiconductor layer, and a second semiconductor layer disposed on the optical absorption layer, the first semiconductor layer including a first conductivity-type III-V group compound semiconductor, the optical absorption layer including a type-II superlattice structure, the second semiconductor layer including a second conductivity-type III-V group compound semiconductor,
• wherein each of the electrodes of the photodiodes is disposed on a surface of the first semiconductor layer that faces to the light receiving surface of the substrate through the opening of the bonding portion,
• the electrode is in contact with the first semiconductor layer at the surface of the first semiconductor layer,
• the electrode has an opening, and
• the surface of the first semiconductor layer is exposed through the opening of the electrode.