Theoretical analysis and characterization of the energy conversion and storage efficiency of photo-supercapacitors

Balthazar Pierre Lechene (1) , Raphael Clerc (2) , Ana Claudia Arias (1)

1 Department of Electrical Engineering and Computer Sciences
2 LHC - Laboratoire Hubert Curien

The time-dependent dynamics of the charge and discharge of photo-supercapacitors (PSC), devices which combine a supercapacitor with a solar cell, are investigated using a semi-analytical model. For a given PSC, it is found that the maximum Energy Conversion and Storage Efficiency (ECSE) is a direct function of the Power Conversion Efficiency (PCE) and Fill Factor (FF) of the solar cell. The capacitance, series and shunt resistances of the supercapacitor affect the time constants of the PSC and the value of the maximum ECSE. To experimentally measure the maximum value of ECSE with at most 2 charge-discharge cycles, a simple experimental procedure is proposed, which consists in comparing the power flowing through the supercapacitor and the energy already stored in it. The theoretical results are validated with experiments on a PSC made from an organic solar cell and a commercial supercapacitor.

Mots clés: Energy conversion and storage efficiency; Solar cell; Supercapacitor; Photorechargeable system; Photo-supercapacitor

Domaines: Micro et nanotechnologies/Microélectronique; Ingénierie de l'environnement

Balthazar Pierre Lechene, Raphael Clerc, Ana Claudia Arias. Theoretical analysis and characterization of the energy conversion and storage efficiency of photo-supercapacitors. Solar Energy Materials and Solar Cells, 2017, ⟨10.1016/j.solmat.2017.07.034⟩. ⟨hal-01583981⟩