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The performance of the self-powered photodetectors based on the Cu2O/electrolyte heterojunctions is optimized by adjusting morphology and structure of the Cu2O film.The Cu2O film with a deposition time of 2000 s possesses a largest current density of 559.6 pA/cm2 under visible light illumination at zero bias,with a rising time of 5.2 ms and a recovering time of 9.0 ms.This optimized Cu2O film has a highest responsivity of about 25.8 mA/W for visible light,and a negligible responsivity for UV light.The high crystallinity and excellent charge transfer property are responsible for the improved photodetection performance.