Enhance performance of organic solar cells based on an isoindigo-based copolymer by balancing absorption and miscibility of electron acceptor.

Zaifei Ma, Ergang Wang, Koen Vandewal, Mats R. Andersson, Fengling Zhang

    Research output: Contribution to journalArticle

    44 Citations (Scopus)

    Abstract

    Superior absorption of PC71BM in visible region to that of PC61BM makes PC71BM a predominant acceptor for most high efficient polymer solar cells (PSCs). However, we will demonstrate that power conversion efficiencies (PCEs) of PSCs based on poly[N,N′-bis(2- hexyldecyl)isoindigo-6,6′-diyl-alt-thiophene-2,5-diyl] (PTI-1) with PC61BM as acceptor are 50 higher than their PC71BM counterparts under illumination of AM1.5G. AFM images reveal different topographies of the blends between PTI-1:PC61BM and PTI-1:PC 71BM, which suggests that acceptor's miscibility plays a more important role than absorption. The photocurrent of 9.1 mA/cm2 is among the highest value in PSCs with a driving force for exciton dissociation less than 0.2 eV.

    Original languageEnglish
    Article number143302
    Pages (from-to)Art: 143302
    Number of pages4
    JournalApplied Physics Letters
    Volume99
    Issue number14
    DOIs
    Publication statusPublished - 3 Oct 2011

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