Photo-ferroelectric perovskite interfaces for boosting VOC in efficient perovskite solar cells

Giovanni Pica, Lorenzo Pancini, Christopher E. Petoukhoff, Badri Vishal, Francesco Toniolo, Changzeng Ding, Young-Kwang Jung, Mirko Prato, Nada Mrkyvkova, Peter Siffalovic, Stefaan De Wolf, Chang-Qi Ma, Frédéric Laquai, Aron Walsh and Giulia Grancini ()
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Giovanni Pica: Università Degli Studi Di Pavia
Lorenzo Pancini: Università Degli Studi Di Pavia
Christopher E. Petoukhoff: King Abdullah University of Science and Technology (KAUST)
Badri Vishal: King Abdullah University of Science and Technology (KAUST)
Francesco Toniolo: Università Degli Studi Di Pavia
Changzeng Ding: Chinese Academy of Sciences (CAS)
Young-Kwang Jung: Imperial College London
Mirko Prato: Materials Characterization Facility
Nada Mrkyvkova: Slovak Academy of Sciences
Peter Siffalovic: Slovak Academy of Sciences
Stefaan De Wolf: King Abdullah University of Science and Technology (KAUST)
Chang-Qi Ma: Chinese Academy of Sciences (CAS)
Frédéric Laquai: King Abdullah University of Science and Technology (KAUST)
Aron Walsh: Imperial College London
Giulia Grancini: Università Degli Studi Di Pavia

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Interface engineering is the core of device optimization, and this is particularly true for perovskite photovoltaics (PVs). The steady improvement in their performance has been largely driven by careful manipulation of interface chemistry to reduce unwanted recombination. Despite that, PVs devices still suffer from unavoidable open circuit voltage (VOC) losses. Here, we propose a different approach by creating a photo-ferroelectric perovskite interface. By engineering an ultrathin ferroelectric two-dimensional perovskite (2D) which sandwiches a perovskite bulk, we exploit the electric field generated by external polarization in the 2D layer to enhance charge separation and minimize interfacial recombination. As a result, we observe a net gain in the device VOC reaching 1.21 V, the highest value reported to date for highly efficient perovskite PVs, leading to a champion efficiency of 24%. Modeling depicts a coherent matching of the crystal and electronic structure at the interface, robust to defect states and molecular reorientation. The interface physics is finely tuned by the photoferroelectric field, representing a new tool for advanced perovskite device design.

Date: 2024
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DOI: 10.1038/s41467-024-53121-8

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