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Article

Improved Electrical and Structural Stability in HTL-Free Perovskite Solar Cells by Vacuum Curing Treatment

1
CNR-IMM, 95121 Catania, Italy
2
Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy
3
Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503, Japan
*
Author to whom correspondence should be addressed.
Energies 2020, 13(15), 3953; https://doi.org/10.3390/en13153953
Received: 10 July 2020 / Revised: 29 July 2020 / Accepted: 30 July 2020 / Published: 1 August 2020
Device engineering with proper material integration into perovskite solar cells (PSCs) would extend their durability provided a special care is spent to retain interface integrity during use. In this paper, we propose a method to preserve the perovskite (PSK) surface from solvent-mediated modification and damage that can occur during the deposition of a top contact and furtherly during operation. Our scheme used a hole transporting layer-free top-contact made of Carbon (mostly graphite) to the side of hole extraction. We demonstrated that the PSK/graphite interface benefits from applying a vacuum-curing step after contact deposition that allowed mitigating the loss in efficiency of the solar devices, as well as a full recovery of the electrical performances after device storage in dry nitrogen and dark conditions. The device durability compared to reference devices was tested over 90 days. Conductive atomic force microscopy (CAFM) disclosed an improved surface capability to hole exchange under the graphite contact after vacuum curing treatment. View Full-Text
Keywords: photovoltaics; perovskite; durability; X-ray diffraction (XRD); CAFM; I-V (current -voltage) curve; storage; recovery; vacuum treatment; interfaces; stability photovoltaics; perovskite; durability; X-ray diffraction (XRD); CAFM; I-V (current -voltage) curve; storage; recovery; vacuum treatment; interfaces; stability
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MDPI and ACS Style

Valastro, S.; Smecca, E.; Sanzaro, S.; Giannazzo, F.; Deretzis, I.; La Magna, A.; Numata, Y.; Jena, A.K.; Miyasaka, T.; Gagliano, A.; Alberti, A. Improved Electrical and Structural Stability in HTL-Free Perovskite Solar Cells by Vacuum Curing Treatment. Energies 2020, 13, 3953. https://doi.org/10.3390/en13153953

AMA Style

Valastro S, Smecca E, Sanzaro S, Giannazzo F, Deretzis I, La Magna A, Numata Y, Jena AK, Miyasaka T, Gagliano A, Alberti A. Improved Electrical and Structural Stability in HTL-Free Perovskite Solar Cells by Vacuum Curing Treatment. Energies. 2020; 13(15):3953. https://doi.org/10.3390/en13153953

Chicago/Turabian Style

Valastro, Salvatore, Emanuele Smecca, Salvatore Sanzaro, Filippo Giannazzo, Ioannis Deretzis, Antonino La Magna, Youhei Numata, Ajay K. Jena, Tsutomu Miyasaka, Antonio Gagliano, and Alessandra Alberti. 2020. "Improved Electrical and Structural Stability in HTL-Free Perovskite Solar Cells by Vacuum Curing Treatment" Energies 13, no. 15: 3953. https://doi.org/10.3390/en13153953

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