A Universal Interfacial Dipole Strategy for Defect Suppression in Inverted Perovskite Solar Cells With Tunable Bandgaps

Li C, Park H, Streller F, Götz K, Byun J, Qiu S, Yuan Z, Englhard J, Vincze A, Peng Z, Dong L, Wang Y, Liu C, Tian J, Feng M, Liao PC, Yang F, Späth A, Osvet A, Heumüller T, Halik M, Christiansen SH, Unruh T, Bachmann J, Fink R, Li N, Lüer L, Brabec C (2026)

Publication Type: Journal article

Publication year: 2026

Journal

DOI: 10.1002/adfm.75435

Abstract

Perovskite solar cells (PSCs) experience significant photovoltage losses due to nonradiative recombination, especially in p–i–n devices with Fullerene C60 as the electron transport layer (ETL), which limits device performance. To tackle this issue, we propose a strategy that synergistically suppresses nonradiative recombination at the perovskite/C60 interface by employing a 2D heterointerface with a two-site anchor bridge, which reduces the surface defect density. This process elevates the fermi level and enhances the electric field, facilitating electron extraction at the perovskite/C60 heterointerface. As a result, nonradiative recombination at this electron-selective perovskite contact is greatly suppressed. p–i–n PSCs fabricated using this interface engineering approach achieved a power conversion efficiency (PCE) of 26.32% and demonstrated excellent stability under continuous maximum power point tracking, along with an open-circuit voltage (Voc) of 1.217 V. This broadly applicable and scalable approach further delivers an impressive Voc of up to 1.368 V in wide-bandgap (1.8 eV) devices. Overall, the strategy offers a viable pathway toward efficient and stable inverted PSCs, demonstrating broad compatibility with diverse perovskite compositions.

Authors with CRIS profile

Involved external institutions

International Laser Centre Bratislava Slovenia (SI) Soochow University, Suzhou / 苏州大学 China (CN) South China University of Technology (SCUT) / 华南理工大学 China (CN) Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS) Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) Germany (DE)

How to cite

APA:

Li, C., Park, H., Streller, F., Götz, K., Byun, J., Qiu, S.,... Brabec, C. (2026). A Universal Interfacial Dipole Strategy for Defect Suppression in Inverted Perovskite Solar Cells With Tunable Bandgaps. Advanced Functional Materials. https://doi.org/10.1002/adfm.75435

MLA:

Li, Chaohui, et al. "A Universal Interfacial Dipole Strategy for Defect Suppression in Inverted Perovskite Solar Cells With Tunable Bandgaps." Advanced Functional Materials (2026).

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