Suppression of Stacking Faults for Stable Formamidinium‐Rich Perovskite Absorbers

The poor intrinsic perovskite absorber stability is arguably a central limitation challenging the prospect of commercialization for photovoltaic (PV) applications. Understanding the nanoscopic structural features that trigger instabilities in perovskite materials is essential to mitigate device degradation. Using nanostructure characterization techniques, we observe the local degradation to be initiated by material loss at stacking faults, forming inherently in the (011)-faceted perovskite domains in different formamidinium lead triiodide perovskite compositions. We introduce Ethylene Thiourea (ETU) as an additive into the perovskite precursor, which manipulates the perovskite crystal growth and results in dominantly in-and out-of-plane (001) oriented perovskite domains. Combining in-depth experimental analysis and density functional theory calculations, we find that ETU lowered the perovskite formation energy, readily enabling crystallization of the perovskite phase at room temperature without the need for an antisolvent quenching step. This facilitated the fabrication of high-quality large area 5 cm by 5 cm blade-coated perovskite films and devices. Encapsulated and unmasked ETU-treated devices, with an active area of 0.2 cm<sup>2</sup>, retained > 93 % of their initial power conversion efficiency (PCE) for > 2100 hours at room temperature, and additionally, 1 cm<sup>2</sup> ETU-treated devices maintained T80 (the duration for the PCE to decay to 80 % of the initial value) for > 600 hours at 65 °C, under continuous 1-sun illumination at the maximum power point in ambient conditions. Our demonstration of scalable and stable perovskite solar cells represents a promising step towards achieving a reliable perovskite PV technology.

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Publication Details

Journal
Advanced Materials
Published
2025-04-16
DOI
https://doi.org/10.1002/adma.202502142
Citations
1
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
0.73

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article

Suppression of Stacking Faults for Stable Formamidinium‐Rich Perovskite Absorbers

Kerem Artuk, Quentin Jeangros, Victor Boureau, Nikolaos Lempesis et al.
1 citations
Advanced Materials
Perovskite Materials and Applications
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article

Suppression of Stacking Faults for Stable Formamidinium‐Rich Perovskite Absorbers

Kerem Artuk, Quentin Jeangros, Victor Boureau, Nikolaos Lempesis, Aïcha Hessler‐Wyser, Lorenzo Agosta, Christophe Ballif, Julian A. Steele, Mounir Mensi, Stefan Zeiske, Adriana Paracchino, Ardalan Armin, Virginia Carnevali, Eduardo Solano, Wolfgang Tress, Amit Kumar Sachan, Vladislav Sláma, Aurélien Bornet, Austin G. Kuba, Fan Fu, Sandra Jenatsch, Nicolas Blondiaux, Huagui Lai, Giuseppe Portale, Rui Zhang, Ursula Röthlisberger, Christian M. Wolff, Mohammad Reza Golobostanfard, Lisa Champault, Mostafa Othman, Anaël Jaffrès, Beat Ruhstaller
article en
1 citations

Abstract

The poor intrinsic perovskite absorber stability is arguably a central limitation challenging the prospect of commercialization for photovoltaic (PV) applications. Understanding the nanoscopic structural features that trigger instabilities in perovskite materials is essential to mitigate device degradation. Using nanostructure characterization techniques, we observe the local degradation to be initiated by material loss at stacking faults, forming inherently in the (011)-faceted perovskite domains in different formamidinium lead triiodide perovskite compositions. We introduce Ethylene Thiourea (ETU) as an additive into the perovskite precursor, which manipulates the perovskite crystal growth and results in dominantly in-and out-of-plane (001) oriented perovskite domains. Combining in-depth experimental analysis and density functional theory calculations, we find that ETU lowered the perovskite formation energy, readily enabling crystallization of the perovskite phase at room temperature without the need for an antisolvent quenching step. This facilitated the fabrication of high-quality large area 5 cm by 5 cm blade-coated perovskite films and devices. Encapsulated and unmasked ETU-treated devices, with an active area of 0.2 cm<sup>2</sup>, retained > 93 % of their initial power conversion efficiency (PCE) for > 2100 hours at room temperature, and additionally, 1 cm<sup>2</sup> ETU-treated devices maintained T80 (the duration for the PCE to decay to 80 % of the initial value) for > 600 hours at 65 °C, under continuous 1-sun illumination at the maximum power point in ambient conditions. Our demonstration of scalable and stable perovskite solar cells represents a promising step towards achieving a reliable perovskite PV technology.

Advanced MaterialsVol. 37(26)
Linköping University (SE), Swiss Center for Electronics and Microtechnology (Switzerland) (CH), The University of Queensland (AU), University of Groningen (NL), University of Ioannina (GR), ALBA Synchrotron (Spain) (ES), Swansea University (GB), Fluxim (Switzerland) (CH), Sulzer (Switzerland) (CH), École Polytechnique Fédérale de Lausanne (CH), Swiss Federal Laboratories for Materials Science and Technology (CH), ZHAW Zurich University of Applied Sciences (CH)
Australian Nuclear Science and Technology Organisation, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Australian Research Council, Horizon 2020
Openalex Percentile: Top 29%
Perovskite Materials and Applications
0.73
DOIOpen Access PDFOpenAlex
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