A Universal Interfacial Dipole Strategy for Defect Suppression in Inverted Perovskite Solar Cells With Tunable Bandgaps
ABSTRACT Perovskite solar cells (PSCs) experience significant photovoltage losses due to nonradiative recombination, especially in p–i–n devices with Fullerene C 60 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/C 60 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/C 60 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 V oc 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
- Julien Bachmann (ORCID: https://orcid.org/0000-0001-6480-6212)
- Marcus Halik (ORCID: https://orcid.org/0000-0001-5976-0862)
- Larry Lüer (ORCID: https://orcid.org/0000-0001-9952-4207)
- Á. Vincze
- Tobias Unruh (ORCID: https://orcid.org/0000-0002-8903-4850)
- Hyoungwon Park (ORCID: https://orcid.org/0000-0002-7614-6415)
- Andreas Späth (ORCID: https://orcid.org/0000-0002-6633-5124)
- Fabian Streller (ORCID: https://orcid.org/0000-0001-5069-2429)
- Klaus Götz (ORCID: https://orcid.org/0000-0003-2019-2137)
- Shudi Qiu (ORCID: https://orcid.org/0000-0002-3005-5788)
- Zhangyu Yuan (ORCID: https://orcid.org/0000-0003-4372-0959)
- Peichun Liao
- Thomas Heumueller (ORCID: https://orcid.org/0000-0002-6974-410X)
- R. Fink (ORCID: https://orcid.org/0000-0002-6896-4266)
- Jonas Englhard (ORCID: https://orcid.org/0000-0003-0958-1545)
- Chao Liu (ORCID: https://orcid.org/0000-0002-8539-1914)
- Ning Li (ORCID: https://orcid.org/0000-0003-1208-4638)
- Jingjing Tian (ORCID: https://orcid.org/0000-0003-2405-4268)
- Mingjie Feng
- Chaohui Li (ORCID: https://orcid.org/0000-0002-8399-4244)
- Fu Yang
- Lirong Dong
- Silke H. Christiansen
- Jiwon Byun
- Christoph J. Brabec (ORCID: https://orcid.org/0000-0002-9440-0253)
- Andres Osvet
- Zijian Peng
Institutions
- Forschungszentrum Jülich (DE)
- Friedrich-Alexander-Universität Erlangen-Nürnberg (DE)
- Soochow University (CN)
- Helmholtz Institute Erlangen-Nürnberg (DE)
- International Laser Center (SK)
- Fraunhofer Institute for Ceramic Technologies and Systems (DE)
- South China University of Technology (CN)
Publication Details
- Journal
- Advanced Functional Materials
- Published
- 2026-04-21
- DOI
- https://doi.org/10.1002/adfm.75435
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00