Light-Induced Interfacial Dynamics Dramatically Improve the Photocurrent in Dye-Sensitized Solar Cells: an Electrolyte Effect

Jiajia Gao, Ahmed El- zohry, Herri Trilaksana, Erik Gabrielsson, Valentina Leandri, Hanna Ellis, Luca D'Amario, Majid Safdari, James Gardner, Gunther Andersson, Lars Kloo

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    2 Citations (Scopus)
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    Abstract

    A significant increase in the photocurrent generation during light soaking for solar cells sensitized by the triphenylamine-based D−π–A organic dyes (PD2 and LEG1) and mediated by cobalt bipyridine redox complexes has been observed and investigated. The crucial role of the electrolyte has been identified in the performance improvement. Control experiments based on a pre-treatment strategy reveals TBP as the origin. The increase in the current and IPCE has been interpreted by the interfacial charge-transfer kinetics studies. A slow component in the injection kinetics was exposed for this system. This change explains the increase in the electron lifetime and collection efficiency. Photoelectron spectroscopic measurements show energy shifts at the dye/TiO2 interface, leading us to formulate a hypothesis with respect to an electrolyte-induced dye reorganization at the surface.
    Original languageEnglish
    Pages (from-to)26241-26247
    Number of pages7
    JournalACS Applied Materials & Interfaces
    Volume10
    Issue number31
    DOIs
    Publication statusPublished - 8 Aug 2018

    Bibliographical note

    This is an open access article published under a Creative Commons Attribution (CC-BY)
    License, which permits unrestricted use, distribution and reproduction in any medium,
    provided the author and source are cited.

    Keywords

    • dye-sensitized solar cells
    • electrolyte
    • interface
    • Dynamics
    • light soaking
    • dynamics

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