Efficient MoOx-Free Semitransparent Perovskite Solar Cell for a 22.4% 4-T Tandem with a 3% Boost over Commercially-Available Al-BSF Si Cell

F. Javier Ramos^a^,^b, Sebastien Jutteau^a^,^c, Jorge Posada^a^,^c, Adrien Bercegol^a^,^c, Amelle Rebai^a, Thomas Guillemot^d, Romain Bodeux^a^,^c, Nathanaelle Schneider^a^,^b, Nicolas Loones^a^,^c, Daniel Ory^a^,^c, Cedric Broussillou^e, Gilles Goaer^e, Laurent Lombez^a^,^b, Jean Rousset^a^,^c

^aInstitut Photovoltaïque d'Ile-de-France (IPVF), Boulevard Thomas Gobert, 18, Palaiseau, France

^bIRDEP, Institute of Research and Development on Photovoltaic Energy (IRDEP), UMR 7174 CNRS-EDF- Chimie ParisTech, France

^cEDF R&D, 6 Quai Wattier, 78400 CHATOU, France

^dLicorne Laboratory, ECE Paris, 37 quai de Grenelle, 75015 Paris, France

^ePhotowatt, EDF ENR PWT, 33 rue Saint-Honoré, Z.I. Champfleuri, 38300 Bourgoin-Jallieu, France

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)

Benidorm, Spain, 2018 May 28th - 31st

Organizers: Emilio Palomares and Rene Janssen

Oral, F. Javier Ramos, presentation 140
DOI: https://doi.org/10.29363/nanoge.hopv.2018.140
Publication date: 21st February 2018

The outstanding progress of hybrid organic-inorganic Perovskite Solar Cells (PSC) have made them one of the most promising photovoltaic technologies currently. In particular, their excellent electro-optical properties such as wide tunable bandgap and high diffusion lengths, in combination with a great variety of possibilities for their fabrication have converted them in interesting candidates for top cells in perovskite/silicon tandems.

In this work, the fabrication of highly efficient semitransparent PSCs with a sputtered-ITO back contact is reported. It is worthy to remark that the MoO_x layer commonly reported between Spiro-OMeTAD and ITO to avoid degradation was found unnecessary to ensure good quality and reproducibility of the system. Therefore, the architecture here proposed was ITO/Spiro-OMeTAD/(Cs,MA,FA)Pb(Br,I)₃/mp-TiO₂/bl-TiO₂/FTO/Glass. After a careful optimization of perovskite thickness and ITO deposition conditions an overall 17% efficiency in small area (J_SC=20.34 mA cm^-2, V_OC=1095 mV, FF=76.2%) and 16.7% for 0.64cm² (J_SC=21.53mA cm^-2, V_OC=1065mV, FF=73.0%) were achieved.

Using time-resolved photoluminescence imaging (TRPL) on both p-type and n-type sides of the semitransparent PSC (i.e. illuminating through ITO and FTO respectively), the principal physical properties linked to recombination and diffusion processes were studied. Hence, carrier mobility in the absorber layer and the quality of the perovskite/TiO₂ interface were identified as the most limiting parameters for overall performance, confirming MoO_x film were not critical for a semitransparent PSC with high efficiency.

After that, a conventional commercially-available aluminum back surface field (Al-BSF) silicon solar cell 19.5% efficient (J_SC=38.46mA cm^-2, V_OC=639mV, FF=79.4%) was reduced to adapt with the size of our bigger semitransparent PSC (18.5% efficiency after cutting). For 4-terminal (4T) tandem assembly, our champion semitransparent PSC was employed as top cell and the reduced Si cell as bottom one, employing an optical coupling by dripping a liquid between both. Under these conditions, the bottom silicon solar cell showed a 5.7% behavior (J_SC=12.75mA cm^-2, V_OC=585mV, FF=77.0%). Consequently, a 22.4% efficiency can be asserted for the 4T perovskite/silicon tandem construction, which corresponds with a 3% improvement over the reference efficiency of the commercial Si solar cell (a 4% when if the cut one is considered).

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