Utilizing semiconductor materials for solar-driven hydrogen production is an alternative to hy-drogen generation using fossil fuels.Organic photocatalysts,composed of abundant elements such as C,H,and 0 on Earth,have the advantage over inorganic catalysts due to their tunable electronic properties through molecular engineering.However,the current understanding of the key properties of their photo-catalytic oxidation-reduction process is not complete,hindering further development into more cost-effec-tive and competitive technologies.This paper reviews the progress in organic semiconductor photocatalysis and research on its mechanisms.Starting with the description of charge transfer in organic semiconduc-tors,it outlines the current state of research on the hydrogen evolution reaction(HER)of organic photo-catalysts,analyzes the behavior of excitons after photoexcitation,and proposes strategies to improve the efficiency of hydrogen production by organic semiconductor photocatalysis.Finally,it summarizes the re-search progress on conjugated supramolecular and the development of organic photocatalyst is expected and prospected.
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