Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon

F. Javier Ramos (1) , Sébastien Jutteau (1) , Jorge Posada (1) , Adrien Bercegol (2, 1) , Amelle Rebai (1) , Thomas Guillemot , Romain Bodeux (1) , Nathanaelle Schneider (1) , Nicolas Loones (1) , Daniel Ory (1, 2) , Cédric Broussillou , Gilles Goaer (1) , Laurent Lombez (1) , Jean Rousset (1, 2)

1 IPVF - Institut Photovoltaïque d’Ile-de-France (UMR)
2 EDF R&D - EDF R&D

In this work, the fabrication of MoOx-free semitransparent perovskite solar cells (PSC) with Power Conversion Efficiencies (PCE) up to 15.7% is reported. Firstly, opaque PSCs up to 19.7% were fabricated. Then, the rear metal contact was replaced by a highly transparent and conductive indium tin oxide (ITO) film, directly sputtered onto the hole selective layer, without any protective layer between Spiro-OMeTAD and rear ITO. To the best of our knowledge, this corresponds to the most efficient buffer layer-free semitransparent PSC ever reported. Using time-resolved photoluminescence (TRPL) technique on both sides of the semitransparent PSC, Spiro-OMeTAD/perovskite and perovskite/TiO2 interfaces were compared, confirming the great quality of Spiro-OMeTAD/perovskite interface, even after damage-less ITO sputtering, where degradation phenomena result less important than for perovskite/TiO2 one. Finally, a 4-terminal tandem was built combining semitransparent PSC with a commercially-available Aluminium Back Surface Field (Al-BSF) silicon wafer. That silicon wafer presents PCE = 19.52% (18.53% after being reduced to cell size), and 5.75% once filtered, to generate an overall 4 T tandem efficiency of 21.18% in combination with our champion large semitransparent PSC of 15.43%. It means an absolute increase of 1.66% over the original silicon wafer efficiency and a 2.65% over the cut Si cell

Domaines: Matériaux; Energie électrique

F. Javier Ramos, Sébastien Jutteau, Jorge Posada, Adrien Bercegol, Amelle Rebai, et al.. Highly efficient MoOx-free semitransparent perovskite cell for 4 T tandem application improving the efficiency of commercially-available Al-BSF silicon. Scientific Reports, 2018, 8 (1), pp.16139. ⟨10.1038/s41598-018-34432-5⟩. ⟨hal-02148698⟩