Journal
CHEMSUSCHEM
Volume 14, Issue 17, Pages 3520-3527Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100080
Keywords
all-polymer solar cells; cyano functionalization; organic field-effect transistors; photovoltaics; polymer acceptor
Funding
- National Research Foundation of Korea (NRF) Grant of the Korean Government [2020R1A4A1018516, 2020M3H4A1A02084906]
- Ministry of SMEs and Startups of the Korean Government [1425144083]
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Quinoxaline (Qx) derivatives have shown promise as building units for efficient photovoltaic polymers, with the newly developed Qx-based polymer acceptors demonstrating high performance in both organic field-effect transistors and all-polymer solar cells.
Quinoxaline (Qx) derivatives are promising building units for efficient photovoltaic polymers owing to their strong light absorption and high charge-transport abilities, but they have been used exclusively in the construction of polymer donors. Herein, for the first time, Qx-based polymer acceptors (P(A)s) were developed by introducing electron-withdrawing cyano (CN) groups into the Qx moiety (QxCN). A series of QxCN-based P(A)s, P(QxCN-T2), P(QxCN-TVT), and P(QxCN-T3), were synthesized by copolymerizing the QxCN unit with bithiophene, (E)-1,2-di(thiophene-2-yl)ethene, and terthiophene, respectively. All of the P(A)s exhibited unipolar n-type characteristics with organic field-effect transistor (OFET) mobilities of around 10(-2) cm(2) V-1 s(-1). In space-charge-limited current devices, P(QxCN-T2) and P(QxCN-TVT) exhibited electron mobilities greater than 1.0x10(-4) cm(2) V-1 s(-1), due to the well-ordered structure with tight pi-pi stacking. When the P(A)s were applied in all-polymer solar cells (all-PSCs), the highest performance of 5.32 % was achieved in the P(QxCN-T2)-based device. These results demonstrate the significant potential of Qx-based P(A)s for high-performance all-PSCs and OFETs.
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