All-Polymer Photovoltaic Devices of Poly(3-(4- n -octyl)-phenylthiophene) from Grignard Metathesis (GRIM) Polymerization
KAUST Grant NumberKUS-C1-015-21
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Abstract(Graph Presented) The synthesis of poly[3-(4-n-octyl)-phenylthiophene] (POPT) from Grignard Metathesis (GRIM) is reported. GRIM POPT is found to have favorable electronic, optical, and processing properties for organic photovoltaics (OPVs). Space-charge limited current and field effect transistor measurements for POPT yielded hole mobilities of 1 × 10-4 cm2/(V s) and 0.05 cm2/(V s), respectively. Spincasting GRIM POPT from chlorobenzene yields a thin film with a 1.8 eV band gap, and PC61BM:POPT bulk heterojection devices provide a peak performance of 3.1%. Additionally, an efficiency of 2.0% is achieved in an all-polymer, bilayer OPV using poly[2-methoxy-5-(2′-ethylhexyloxy)-1,4-(1-cyanovinylene) phenylene] (CNPPV) as an acceptor. This state-of-the-art all-polymer device is analyzed in comparison to the analogous poly(3-hexylthiophene) (P3HT)/CNPPV device. Counter to expectations based on more favorable energy level alignment, greater active layer light absorption, and similar hole mobility, P3HT/CNPPV devices perform less well than POPT/CNPPV devices with a peak efficiency of 0.93%. © 2009 American Chemical Society.
CitationHolcombe TW, Woo CH, Kavulak DFJ, Thompson BC, Fréchet JMJ (2009) All-Polymer Photovoltaic Devices of Poly(3-(4- n -octyl)-phenylthiophene) from Grignard Metathesis (GRIM) Polymerization . Journal of the American Chemical Society 131: 14160–14161. Available: http://dx.doi.org/10.1021/ja9059359.
SponsorsThis work was supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 and in part by the King Abdullah University of Science and Technology (KAUST) Center for Advanced Molecular Photovoltaics (Award No. KUS-C1-015-21). T.W.H. and C.H.W. thank the NSF for graduate research fellowships. We also thank Jill E. Millstone and Alejandro L. Briseno for helpful discussions.
PublisherAmerican Chemical Society (ACS)
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