Image sensor and imaging device

An image sensor comprising:

• a semiconductor substrate including a plurality of pixel regions, a first surface, and a second surface opposing the first surface;
• a plurality of transistors adjacent to the first surface of the semiconductor substrate in each of the plurality of pixel regions;
• a microlens on the second surface of the semiconductor substrate;
• and
• a plurality of conductive patterns directly in contact with the second surface of the semiconductor substrate to form a Schottky barrier between the plurality of conductive patterns and the second surface of the semiconductor substrate, the plurality of conductive patterns being closer to the second surface of the semiconductor substrate than to the first surface of the semiconductor substrate in each of the plurality of pixel regions, and the plurality of conductive patterns being configured to conduct electrons generated by an optical signal to the semiconductor substrate over the Schottky barrier.