Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 35, Issue 10, Pages 2963-2968Publisher
KOREAN CHEMICAL SOC
DOI: 10.5012/bkcs.2014.35.10.2963
Keywords
Polymer; Photovoltaic; Synthesis; Fluor atom
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2010-0015069, NRF-2013R1A2A2A04014576]
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0010851]
- National Research Foundation of Korea [2011-0010851] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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-dlihexylquinoxaline 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 1.14 mA/cm(2), and FF of 0.35, which yielded PCE of 0.25%.
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