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http://dx.doi.org/10.5012/bkcs.2014.35.10.2963

Synthesis and Photovoltaic Properties of Copolymer Containing Fused Donor and Difluoroquinoxaline Moieties  

Song, Suhee (Department of Physics, Pukyong National University)
Choi, Hyo Il (Department of Industrial Chemistry, Pukyong National University)
Shin, In Soo (Department of Physics, Pukyong National University)
Hyun, Myung Ho (Department of Chemistry, Pusan National University)
Suh, Hongsuk (Department of Chemistry, Pusan National University)
Park, Seong Soo (Department of Industrial Chemistry, Pukyong National University)
Park, Sung Heum (Department of Physics, Pukyong National University)
Jin, Youngeup (Department of Industrial Chemistry, Pukyong National University)
Publication Information
Bulletin of the Korean Chemical Society / v.35, no.10, 2014 , pp. 2963-2968 More about this Journal
Abstract
We report synthesis and photovoltaic properties of two new conjugated copolymers, PCPDTQxF and PDTSQxF, with 6,7-difluoro-2,3-dihexylquinoxaline unit prepared by Stille coupling reaction. The advantage of 6,7-difluoro-2,3-dihexylquinoxaline based copolymer are high PCEs due to lower HOMO energy level, long wavelength absorption and high hole mobility. The solid films of PCPDTQxF and PDTSQxF showed absorption bands with maximum peaks at about 623 and 493 nm and the absorption onsets at 711 and 635 nm, corresponding to band gaps of 1.74 and 1.95 eV, respectively. The oxidation onsets of the PCPDTQxF and PDTSQxF polymers were estimated to be 0.68 and 0.95 V, which correspond to HOMO energy levels of -5.48 and -5.75 eV, respectively. The PDTSQxF has lower HOMO energy level as compared to PCPDTQxF to lead higher $V_{OC}$ value. The device comprising PCPDTQxF:PCBM (1:2) dissolved to a concentration of 1 wt % in ODCB showed $V_{OC}$ value of 0.62 V, $J_{SC}$ value of $1.14mA/cm^2$, and FF of 0.35, which yielded PCE of 0.25%.
Keywords
Polymer; Photovoltaic; Synthesis; Fluoro atom;
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