Synthesis and Characterization of an Anthracene-Based Low Band Gap Polymer for Photovoltaic Devices

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We have synthesized an anthracene-based conjugated polymer, poly[(9,10-bis(oct-1-ynyl) anthracene)-alt-(5,6-bis(octyloxy)-4,7-bis(thiophen-2-yl) benzo-[c][1,2,5]-thiadiazole)] (PANTBT), for application in organic photovoltaic devices. It exhibited a number average molecular weight of 14,300 g/mol and was fairly soluble in chlorinated organic solvents due to flexible octynyl-and octyloxy side chains on the anthracene and benzothiadiazole moieties. PANTBT showed absorption covering 300-660 nm. Through the bond alternation between the electron-sufficient anthracene (and thiophene) and electron-deficient benzothiadiazole units, a band gap of PANTBT was decreased to 1.89 eV, showing a deep HOMO level of -5.31 eV. As a result, PANTBT exhibited promising photovoltaic properties with a PCE value of 1.90% (V-oc = 0.77 V, J(sc) =-6.50 mA/cm(2), FF = 0.38) upon blending with PC71BM under AM 1.5G.
Publisher
AMER SCIENTIFIC PUBLISHERS
Issue Date
2014-08
Language
English
Article Type
Article
Keywords

HETEROJUNCTION SOLAR-CELLS; THIN-FILM-TRANSISTOR; EFFICIENCY; COPOLYMERS

Citation

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.14, no.8, pp.6422 - 6426

ISSN
1533-4880
DOI
10.1166/jnn.2014.8788
URI
http://hdl.handle.net/10203/187298
Appears in Collection
EE-Journal Papers(저널논문)CH-Journal Papers(저널논문)
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