The beneficial effects of mixing spiro-OMeTAD with n-butyl-substituted copper phthalocyanine for perovskite solar cells

Esmaiel Nouri, Yu Long Wang, Qian Chen, Jia Ju Xu, Vassilios Dracopoulos, Lamprini Sygellou, Zong Xiang Xu, Mohammad Reza Mohammadi, Panagiotis Lianos

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Perovskite solar cells have been constructed under ambient conditions by using 2,2',7,7'-Tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) mixed with a small quantity of soluble tetra-n-butyl substituted copper phthalocyanine as hole transporting material. The introduction of the phthalocyanine derivative resulted in an impressive increase of cell efficiency, which changed from 10.4% in the absence to 15.4% in the presence of phthalocyanine. This effect is related to the creation of deep traps in the hole transporting phase which block back-travelling electrons as well as to the improvement of the structural quality of the spiro-OMeTAD film in the presence of phthalocyanine. Both functionalities decrease shunt paths within the hole transporting phase resulting in increasing the fill factor and the open-circuit voltage of the cell.

    Original languageEnglish
    Pages (from-to)1417-1423
    Number of pages7
    JournalElectrochimica Acta
    Volume222
    Early online date21 Nov 2016
    DOIs
    Publication statusPublished - 20 Dec 2016

    Keywords

    • hole transporting material
    • Perovskite solar cells
    • soluble copper phthalocyanine
    • spiro-OMeTAD

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