Functionalized indene-fullerene adducts: synthesis and application for large area flexible perovskite solar cells
Taimoor Ahmad a c, Lukasz Przypis b, Konrad Wojciechowski a b, Kasjan Misztal b, Damian Honisz e, Eros Radicchi d, Edoardo Mosconi d, Wojciech Domagala e, Aldo Di Carlo c, Filippo De Angelis d
a Saule Technologies Ltd., Dunska11, Wroclaw 54-427, Poland
b Saule Research Institute, Dunska11, Wroclaw 54-427, Poland
c University of Rome “Tor Vergata”, Department of Electronics Engineering, Via del Politecnico 1, 00133 Rome, Italy
d University of Perugia Department of Chemistry, Biology and Biotechnology via Elce di Sotto 8 06123 Perugia, Italy
e Faculty of Chemistry, Silesian University of Technology, Marcina Strzody 9, Gliwice 44-100, Poland
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, Taimoor Ahmad, 193
Publication date: 11th May 2021

Perovskite solar cells (PSC) have received a lot of interest as one of the most favourable emerging PV technology. The facile fabrication methods has made this technology favorable for commercial development. Recently, perovskite solar cells has achieved, the power conversion efficiency (PCE) reaching 25.6%.[1] This progress in perovskite PV technology is achieved via drastic research efforts in the domain of engineering of variety of layers in the solar cell stack. Electron transporting layer (ETL) is one of the most important layers, its modification, deposition, and optimization are the main challenges to be considered for high performance solar cells. The interface between ETL and perovskite active layer, plays a crucial role for the efficient extraction and transport of charges with minimum recombination losses between these layers.

In this work, we synthesis and characterization of a family of indene-C60 adducts obtained via Diels-Alder cycloaddition [4+2]. The new C60 derivatives include indenes with a variety of functional groups. This synthetic methodology provides a novel approach to obtain a wide spectrum of indene-fullerene adducts, which are inaccessible by previous conventional. We also performed computational simulations and CV measurements, the result of which indicates the LUMO energy levels are in the right place for these compounds. Therefore, these adducts were considered as electron transporting materials (ETMs) for planar heterojunction perovskite solar cells. Selected derivatives were applied into inverted (p-i-n configuration) perovskite device architectures, fabricated on flexible polymer substrates, with large active areas (1 cm2). One of them (6’-Acetamido-1′,4′-dihydro-naphtho[2′,3′:1,2][5,6]fullerene-C60 – NHAc-ICMA) showed power conversion efficiency (PCE) of 13.61%.

The authors are grateful to the National Science Centre (Poland) for the NCN Opus grant no. UMO-2016/23/B/ST5/02861.

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