In 1958, Kearns and Calvin of the University of California, Berkeley embedded magnesium phthalocyanine dye between two electrodes and successfully prepared the first OPV battery. Although the device can only generate a voltage of 200mV and the energy conversion efficiency is very low, it undoubtedly reveals the potential of organic semiconductor materials. [23] In the following twenty years, the progress of OPV battery was very slow.
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