Two-in-one: cathode modification and improved solar cell blend stability through addition of modified fullerenes

Zandra George, Yuxin Xia, Anirudh Sharma, Camilla Lindqvist, Gunther Andersson, Olle Inganas, Ellen Moons, Christian Muller, Mats R. Andersson

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    The synthesis of dual purpose modified fullerenes with pyridine- as well as amine-functional groups is reported. Addition of these fullerenes to a polymer : fullerene bulk-heterojunction blend based on a thiophene-quinoxaline donor polymer is found to modify the active layer/cathode interface of inverted solar cells (glass/ITO/active layer/MoO3/Al). In particular the open-circuit voltage of devices is increased from 0.1 V to about 0.7 V, which results in a drastic rise in photovoltaic performance with a power conversion efficiency of up to 3%. At the same time, presence of the functionalised fullerene additives prevents the detrimental formation of micrometre-sized fullerene crystals upon annealing at 140 °C. As a result, the device performance is retained, which promises significantly increased thermal stability of the bulk-heterojunction blend nanostructure.

    Original languageEnglish
    Pages (from-to)2663-2669
    Number of pages7
    JournalJournal of Materials Chemistry A
    Volume4
    Issue number7
    DOIs
    Publication statusPublished - 2016

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