High-photovoltage all-polymer solar cells based on a diketopyrrolopyrrole–isoindigo acceptor polymer

Zhaojun Li, Xiaofeng Xu, Wei Zhang, Zewdneh Genene, Wendimagegn Mammo, Arkady Yartsev, Mats R. Andersson, Rene Janssen, Ergang Wang

    Research output: Contribution to journalArticlepeer-review

    36 Citations (Scopus)

    Abstract

    In this work, we synthesized and characterized two new n-type polymers PTDPP-PyDPP and PIID-PyDPP. The former polymer is composed of pyridine-flanked diketopyrrolopyrrole (PyDPP) and thiophene-flanked diketopyrrolopyrrole (TDPP). The latter polymer consists of PyDPP and isoindigo (IID). PIID-PyDPP exhibits a much higher absorption coefficient compared to the widely used naphthalene diimide (NDI)-based acceptor polymers, and its high-lying LUMO level affords it to achieve a high open-circuit voltage (Voc). As a result, an all-polymer solar cell (all-PSC) fabricated from a high band gap polymer PBDTTS-FTAZ as the donor and PIID-PyDPP as the acceptor attained a high Voc of 1.07 V with a power conversion efficiency (PCE) of 4.2%. So far, it has been one of the highest PCEs recorded from all-PSCs using diketopyrrolopyrrole (DPP)-based acceptors. Gratifyingly, no obvious PCE decay was observed in two weeks, unraveling good stability of the all-PSC. This work demonstrates that the electron-withdrawing PyDPP unit can be a promising building block for new acceptor polymers in all-PSCs.

    Original languageEnglish
    Pages (from-to)11693-11700
    Number of pages8
    JournalJournal of Materials Chemistry A
    Volume5
    Issue number23
    DOIs
    Publication statusPublished - 2017

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