A photoelectric conversion device including a photoelectric conversion module, wherein the photoelectric conversion module includes a carbon nanotube structure and a cover structure, the carbon nanotube structure includes a carbon nanotube, the carbon nanotube includes two metallic carbon nanotube segments and one semiconducting carbon nanotube segment between the two metallic carbon nanotube segments, the cover structure covers only a portion of the semiconducting carbon nanotube segment, the part area is a covered area.