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

Author

Listed:
  • Salvatore Valastro

    (CNR-IMM, 95121 Catania, Italy
    Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy)

  • Emanuele Smecca

    (CNR-IMM, 95121 Catania, Italy)

  • Salvatore Sanzaro

    (CNR-IMM, 95121 Catania, Italy)

  • Filippo Giannazzo

    (CNR-IMM, 95121 Catania, Italy)

  • Ioannis Deretzis

    (CNR-IMM, 95121 Catania, Italy)

  • Antonino La Magna

    (CNR-IMM, 95121 Catania, Italy)

  • Youhei Numata

    (Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503, Japan)

  • Ajay Kumar Jena

    (Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503, Japan)

  • Tsutomu Miyasaka

    (Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503, Japan)

  • Antonio Gagliano

    (Department of Electrical, Electronic and Computer Engineering, University of Catania, 95125 Catania, Italy)

  • Alessandra Alberti

    (CNR-IMM, 95121 Catania, Italy)

Abstract

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.

Suggested Citation

  • Salvatore Valastro & Emanuele Smecca & Salvatore Sanzaro & Filippo Giannazzo & Ioannis Deretzis & Antonino La Magna & Youhei Numata & Ajay Kumar Jena & Tsutomu Miyasaka & Antonio Gagliano & Alessandra, 2020. "Improved Electrical and Structural Stability in HTL-Free Perovskite Solar Cells by Vacuum Curing Treatment," Energies, MDPI, vol. 13(15), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3953-:d:393244
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    References listed on IDEAS

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    1. Alessandra Alberti & Corrado Bongiorno & Emanuele Smecca & Ioannis Deretzis & Antonino La Magna & Corrado Spinella, 2019. "Pb clustering and PbI2 nanofragmentation during methylammonium lead iodide perovskite degradation," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
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