Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Enhancing the interface between the perovskite layer and the electron transporting layer (ETL) is crucial in order to improve the performance and stability of perovskite solar cells (PSCs). This is particularly important in the inverted (p-i-n) configuration adopting fullerene-based ETLs. In this study, we propose a scalable approach to enhance fullerene-based ETLs by incorporating high-quality few-layer graphene flakes (GFs), industrially available from BeDimensional S.p.A, into phenyl-C61-butyric acid methyl ester (PCBM). Our new composite ETL (GF:PCBM) can be processed into an ultra-thin (~10 nm) and pinhole-free film on top of the perovskite layer, as shown by SEM and AFM morphology analyses. Photoluminescence, Kelvin Probe and conductivity studies reveal that the incorporation of GFs into the PCBM matrix reduces defect-mediated recombination at the interface and creates preferred pathways for electron extraction towards the current collector. Using our GF-based composite ETL resulted in a significant enhancement in the open circuit voltage and fill factor of triple cation-based inverted PSCs, boosting the power conversion efficiency from ~19% to 20.8%.
This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under grant agreement no. 881603-GrapheneCore3. A.Z. and G.G. acknowledge the “HY-NANO” project that received funding from the European Research Council (ERC) Starting Grant 2018 under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 802862.
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