Open circuit voltage 20 Solar cells 6 Conversion efficiency 5 Efficiency 4 Perovskite 4 Battery management systems 3 Charging (batteries) 3 Energy harvesting 3 Lithium-ion batteries 3 Maximum power point 3 Open-circuit voltages 3 Perovskite solar cells 3 Power conversion efficiencies 3 Timing circuits 3 Cell-be 2 Cell/B.E 2 Charge recombinations 2 Charge transfer 2 DC-DC converters 2 Dye-sensitized solar cells 2 Electrochemical impedance spectroscopy 2 Electronic equipment 2 Energy gap 2 Fill-factor 2 III-V semiconductors 2 Iron compounds 2 Lead compounds 2 Lithium compounds 2 Lithium ions 2 MATLAB 2