Efficient Blade-Coated Wide-Bandgap Perovskite Solar Cells via Interface Engineering
Most high-efficiency all-perovskite tandem solar cells use a "superstrate" configuration, integrating a wide-bandgap (WBG) top subcell and a narrow bandgap (NBG) bottom subcell. However, this structure suffers oxidative degradation due to easily air-exposable bottom NBG subcells. A "substrate" structure offers improved stability for tandems by encapsulating the NBG top subcell with the air-stable WBG bottom subcell. However, conventional WBG perovskite solar cells (PSCs) using water-based NiO<i><sub><i>x</i></sub></i> interlayers hinder their fabrication on top of the NBG subcells in an inert atmosphere. To overcome this, we developed a nonaqueous NiO<i><sub><i>x</i></sub></i> nanoparticle dispersion, enabling interlayer fabrication inside a glove box. The blade-coated NiO<i><sub><i>x</i></sub></i> interlayer facilitated the formation of a densely packed 2PACz (2-(9<i>H</i>-carbazol-9-yl)ethyl]phosphonic acid) monolayer hole transporting layer (HTL). The energetically aligned 2PACz molecules reduced minority carrier recombination at the NiO<i><sub><i>x</i></sub></i>/perovskite interface. As a result, the fully scalable 1.77 eV WBG PSCs employing a NiO<i><sub><i>x</i></sub></i>/2PACz hybrid HTL delivered a champion power conversion efficiency of 17.4%.
Authors
- Pascal Rohrbeck (ORCID: https://orcid.org/0000-0002-1514-6008)
- Johnpaul Kurisinkal Pious (ORCID: https://orcid.org/0000-0001-6831-8267)
- Ayodhya N. Tiwari (ORCID: https://orcid.org/0000-0002-8078-5965)
- Severin Siegrist (ORCID: https://orcid.org/0000-0002-1964-8259)
- Radha K. Kothandaraman (ORCID: https://orcid.org/0000-0001-5540-4916)
- Fan Fu (ORCID: https://orcid.org/0000-0002-3647-4086)
- Stefan A. L. Weber (ORCID: https://orcid.org/0000-0003-3052-326X)
- Sunil B. Shivarudraiah (ORCID: https://orcid.org/0000-0002-6919-024X)
- Thomas A. Jung (ORCID: https://orcid.org/0000-0003-0717-9886)
- Roland Widmer (ORCID: https://orcid.org/0000-0002-9226-3136)
- Chih‐Jen Shih (ORCID: https://orcid.org/0000-0002-5258-3485)
- Aaron H. Oechsle
Institutions
- University of Stuttgart (DE)
- Johannes Gutenberg University Mainz (DE)
- Paul Scherrer Institute (CH)
- ETH Zurich (CH)
- Bioengineering (Switzerland) (CH)
- Max Planck Institute for Polymer Research (DE)
- Swiss Federal Laboratories for Materials Science and Technology (CH)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2025-04-09
- DOI
- https://doi.org/10.1021/acsami.5c03709
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Eidgenössische Materialprüfungs- und Forschungsanstalt
- Bundesamt für Energie
- Staatssekretariat für Bildung, Forschung und Innovation
- HORIZON EUROPE Climate, Energy and Mobility