期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 98, 期 -, 页码 71-77出版社
ELSEVIER
DOI: 10.1016/j.solmat.2011.09.008
关键词
Chromophore; Bulk heterojunction; Organic solar cells; PCBM; Solution process
资金
- Air Force Office of Scientific Research [FA95500910361]
- National Science Foundation [DMR0702372]
- National Research Foundation of Korea
- Korean Government [NRF-2009-352-D00080]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0702372] Funding Source: National Science Foundation
Tricyanofuran-based small molecules were synthesized through Knoevenagel reaction with formyl heteroaromatic donating moieties and 2-cyanomethylene-3-cyano-4,5,5-trimethyl-2,5-dihydrofuran (TCF) as a strong acceptor. UV-vis absorption demonstrated that the combination of TCF with donating units resulted in an enhanced intra-molecular charge transfer (ICT) transition, which led to long wavelength absorption in the chromophores. The absorption coefficients and the molecular energy levels of the chromophores can be tuned effectively by employing different donating groups. The chromophores were used in conjunction with [6,6]-phenyl C61 butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) to fabricate organic heterojunction photovoltaic cells. This solution-processed bulk heterojunction (BHJ) solar cells exhibited a power conversion efficiency (PCE) of 2.44%, a short-circuit current density (J(SC)) of 8.74 mA/cm(2), and an open-circuit voltage (V-OC) of 0.93 V under simulated air mass 1.5 global irradiation (100 mW/cm(2)). (C) 2011 Elsevier B.V. All rights reserved.
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