▎ 摘　　要

NOVELTY - Semiconductor-carbon-based photoelectric gain Joule thermal seawater desalination device comprises carbon and/or carbon allotropes as substrate, and composite film composed of photoelectric conversion material particles compounded on the substrate. The photoelectric conversion material particles are photoelectric conversion material particles grown in situ on the substrate in a hydrothermal manner. USE - Used as semiconductor-carbon-based photoelectric gain Joule thermal seawater desalination device. ADVANTAGE - The device has high seawater desalination efficiency. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: eawater desalination method using semiconductor-carbon-based photoelectric gain Joule thermal seawater desalination device; and preparing the semiconductor-carbon-based photoelectric gain Joule thermal seawater desalination device.