Electroactive Interlayers for Inverted Perovskite Solar Cells

Ghewa AlSabeh^a^,^b, Konstantina-Kalliopi Armadorou^a, Andrea Vezzosi^c, Murad Najafov^b, Paul Zimmermann^d, Ursula Röthlisberger^c, Lukas Pfeifer^a, Felix T. Eickemeyer^a, Michael Grätzel^a, Jovana V. Milić^a^,^b

^aLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

^bSmart Energy Materials, Adolphe Merkle Institute, University of Fribourg, Fribourg 1700, Switzerland

^cLaboratory of Computational Chemistry and Biochemistry, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

^dInstitut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV25)

Roma, Italy, 2025 May 12th - 14th

Organizers: Filippo De Angelis, Francesca Brunetti and Claudia Barolo

Poster, Ghewa AlSabeh, 266
Publication date: 17th February 2025

Perovskite solar cells have attracted substantial attention due to their promising efficiency, but their operational stability, particularly at the interfaces with charge transport layers, remains a key limitation. This issue is especially critical in inverted (p-i-n) architectures, where fullerene-based electron transport layers often compromise long-term device stability. In response, the use of low-dimensional perovskite interlayers with hydrophobic organic spacers was explored to improve stability by templating the perovskite structure.^[1] However, conventional organic cations used in these interlayers are typically electronically inert, which hampers charge extraction and reduces overall device efficiency. In this work, we introduce low-dimensional perovskites incorporating electroactive napthalimide- and napthalenediimide-based spacers.^[2,3] These functional organic moieties also enable modification or replacement of the fullerene-based electron transport layers, producing passivated interfaces that support efficient charge transport. This strategy led to improved photovoltaic performance, achieving power conversion efficiencies exceeding 20% along with enhanced device stability, underlining the value of electroactive interlayers in optimizing inverted perovskite solar cells.

References

[1] J. V. Milić, J. Mat. Chem. C 2021, 9, 11428–11443

[2] A. Mishra, P. Ahlawat, G. C. Fish, F. Jahanbakhshi, M. Mladenović, M. Almalki, M. A. Ruiz-Preciado, M. C. Gelvéz-Rueda, D. J. Kubicki, P. A. Schouwink, V. Dufoulon, T. Schneeberger, A. Aslanzadeh, F. C. Grozema, S. M. Zakeeruddin, J.-E. Moser, U. Rothlisberger, L. Emsley, J. V. Milić and M. Grätzel, Chem. Mater., 2021, 33, 6412–6420.

[3] K.K. Armadorou, Ghewa AlSabeh, A. Vezzosi, M. Najafov, P. Zimmermann, U. Röthlisberger, L. Pfeifer, F. T. Eickemeyer, J. V. Milić, M. Grätzel et al., Manuscript under review, J. Mater. Chem. C, 2025.

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