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Facile Sol–Gel-Derived Craterlike Dual-Functioning TiO2 Electron Transport Layer for High-Efficiency Perovskite Solar Cells

  • Sunihl Ma
    Sunihl Ma
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Sunihl Ma
  • Jihoon Ahn
    Jihoon Ahn
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Jihoon Ahn
  • Yunjung Oh
    Yunjung Oh
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Yunjung Oh
  • Hyeok-Chan Kwon
    Hyeok-Chan Kwon
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
  • Eunsong Lee
    Eunsong Lee
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
    More by Eunsong Lee
  • Kyungmi Kim
    Kyungmi Kim
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
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  • Seong-Cheol Yun
    Seong-Cheol Yun
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
  • , and 
  • Jooho Moon*
    Jooho Moon
    Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro Seodaemun-gu, Seoul 03722, Republic of Korea
    *E-mail: [email protected]
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Cite this: ACS Appl. Mater. Interfaces 2018, 10, 17, 14649–14658
Publication Date (Web):April 5, 2018
https://doi.org/10.1021/acsami.8b00549
Copyright © 2018 American Chemical Society
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Supporting Info (1)»

Abstract

Organic–inorganic hybrid perovskite solar cells (PSCs) are considered promising materials for low-cost solar energy harvesting technology. An electron transport layer (ETL), which facilitates the extraction of photogenerated electrons and their transport to the electrodes, is a key component in planar PSCs. In this study, a new strategy to concurrently manipulate the electrical and optical properties of ETLs to improve the performance of PSCs is demonstrated. A careful control over the Ti alkoxide-based sol–gel chemistry leads to a craterlike porous/blocking bilayer TiO2 ETL with relatively uniform surface pores of 220 nm diameter. Additionally, the phase separation promoter added to the precursor solution enables nitrogen doping in the TiO2 lattice, thus generating oxygen vacancies. The craterlike surface morphology allows for better light transmission because of reduced reflection, and the electrically conductive craterlike bilayer ETL enhances charge extraction and transport. Through these synergetic improvements in both optical and electrical properties, the power conversion efficiency of craterlike bilayer TiO2 ETL-based PSCs could be increased from 13.7 to 16.0% as compared to conventional dense TiO2-based PSCs.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.8b00549.

  • Calculation method of pore volume fraction of craterlike bilayer thin film and SEM image of thin films with different ratios of additives, XRD patterns of perovskite/TiO2/FTO with different TiO2 ETLs, device performance statistics, open-circuit voltage versus short-circuit current plot at different irradiances, TRPL fitting data, XPS survey and Ti 2p core-level spectra, log J versus log V plot using the SCLC model, and impedance fitting parameters of PSCs based on different TiO2 ETLs (PDF)

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