Imaging device

An imaging device comprising unit pixels, each unit pixel including:

• a photoelectric conversion unit including
• a first electrode including a first conducting material,
• a second electrode facing the first electrode,
• a photoelectric conversion layer between the first and second electrodes, the photoelectric conversion layer including a first photoelectric conversion material, and
• an electron-blocking layer between the first electrode and the photoelectric conversion layer, the electron-blocking layer including an electron-blocking material;
• and
• a signal detection circuit electrically connected to the first electrode, wherein
• the photoelectric conversion unit is adapted to be applied with a voltage between the first electrode and the second electrode,
• the electron-blocking material has an ionization potential higher than both a work function of the first conducting material and an ionization potential of the first photoelectric conversion material, which allows the photoelectric conversion unit to have a range of the voltage within which a density of current passing between the first electrode and the second electrode when light is incident on the photoelectric conversion layer is substantially equal to that when no light is incident on the photoelectric conversion layer, and
• the range of the voltage is 0.5 V or more.