Flexible graphene-based semitransparent Polymer Solar Cells & Modules
Emanuele Calabrò a, Giuseppina Polino a, Giovanni Bruno b, Giuseppe Valerio Bianco b, Francesca Brunetti a, Aldo Di Carlo a c, Andrea Reale a
a C.H.O.S.E., via Giacomo Peroni 400/402, Roma, 00131, Italy
b CNR NANOTEC - c/o Dipartimento di Chimica, Università di Bari, Via Orabona 4, 70126 Bari, Italy.
c CNR-ISM Istituto di Struttura della Materia, Via del Fosso del Cavaliere 100, 00133, Rome, Italy.
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Online, Spain, 2021 May 24th - 28th
Organizers: Marina Freitag, Feng Gao and Sam Stranks
Poster, Emanuele Calabrò, 198
Publication date: 11th May 2021

Organic Solar Cells (OSCs) are continuing to be one of the most promising new generation photovoltaic due its versatility as printable low-cost electronics with lightness, flexibility, low temperature processing, large area coating and roll-to-roll applicability coupled with high power conversion efficiency (PCE) nowadays exceeding 18%. Recently the winning strategy for boosting performances and stability is demonstrated to be the combination of new Non-fullerene acceptor (NFA) materials and Low-Band Gap polymers as donors. Despite the synthesis cost of those new materials, one of the most expensive elements for the technology remains the transparent conductive electrode (TCO) generally consisting in Indium Tin Oxide (ITO).

Here we present a semi-transparent OSCs and its upscaling to mini-module fabricated on flexible graphene-based PET substrate. The bottom graphene electrode was deposited via Chemical Vapour Deposition (CVD) on top of PET substrates while the top semi-transparent electrode was realized by a combination of Molibdenum Oxide (MoOx) and silver (Ag) forming a MoOx/Ag/MoOx (MAM). Reference devices on PET/ITO substrates based on PBDB-T:ITIC donor:acceptor (D:A) couple exibit a maximum PCE of 6% on small area cell (0.1cm2) and 0.7% on 5cm2 module. ITO-free Graphene-based devices shown a PCE of 2.6% on small area and a PCE of 0.3% on 5cm2. This preliminary work shows the potentiality of the graphene as electrode material for new generation photovoltaics due the possibility to be deposited on flexible and large area substrates.

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