Journal
ADVANCED MATERIALS
Volume 31, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201807577
Keywords
electron-deficient core; fused benzothiadiazole; nonfullerene acceptors; organic photovoltaics; power conversion efficiency
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21875286]
- National Key Research AMP
- Development Projects of China [2017YFA0206600]
- Science Fund for Distinguished Young Scholars of Hunan Province [2017JJ1029]
- NSFC [91633301, 21761132001]
- CUHK
- NSFC/RGC Joint Research Scheme [N_CUHK418/17]
- NSERC
- CIFAR
- Sentinelle Nord
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Narrow bandgap n-type organic semiconductors (n-OS) have attracted great attention in recent years as acceptors in organic solar cells (OSCs), due to their easily tuned absorption and electronic energy levels in comparison with fullerene acceptors. Herein, a new n-OS acceptor, Y5, with an electron-deficient-core-based fused structure is designed and synthesized, which exhibits a strong absorption in the 600-900 nm region with an extinction coefficient of 1.24 x 10(5) cm(-1), and an electron mobility of 2.11 x 10(-4) cm(2) V-1 s(-1). By blending Y5 with three types of common medium-bandgap polymers (J61, PBDB-T, and TTFQx-T1) as donors, all devices exhibit high short-circuit current densities over 20 mA cm(-2). As a result, the power conversion efficiency of the Y5-based OSCs with J61, TTFQx-T1, and PBDB-T reaches 11.0%, 13.1%, and 14.1%, respectively. This indicates that Y5 is a universal and highly efficient n-OS acceptor for applications in organic solar cells.
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