Biophotovoltaic is an adjective used to define a device in which a fraction of the electrons produced during the oxidation of water by photosynthesis are transferred onto an anode and then to a cathode where an electrically driven process takes place. Biophotovoltaic is an adjective used to define a device in which a fraction of the electrons produced during the oxidation of water by photosynthesis are transferred onto an anode and then to a cathode where an electrically driven process takes place. For information about the technology, see biological photovoltaics.