Synthesis and photovoltaic properties of benzimidazole-based copolymer with fluorine atom

Song, Suhee; Kim, Taehyo; Kang, Dong-Ho; Suh, Hongsuk; Hyun, Myung Ho; Park, Seong Soo; Lee, Gun Dae; Kim, Jin Young; Jin, Youngeup

doi:10.1007/s00289-016-1679-2

Cited by 4 publications

(1 citation statement)

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“…Benzodithiophene is a widely used electron donating materials because it readily undergoes polymerization and polymers of dialkoxy benzodithiophene provide high PCEs . The quinoxaline moiety has been widely used as an electron acceptor in PSCs because the two N atoms at the 1,4‐positions make the quinoxaline unit an electron‐deficient molecule, and the two alkyl chains at its 2‐ and 3‐positions lead to good solubility and tenability . Introduction of fluorine atom exhibits the effect on the energy of the charge transfer state caused by electron withdrawing effect of the fluorine atom.…”

Section: Introductionmentioning

confidence: 99%

Photovoltaic polymers based on difluoroqinoxaline units with deep HOMO levels

Song

Keum

Lee

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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We report the synthesis of low bandgap polymers with a difluoroquinoxaline unit by Stille polymerization for use in polymer solar cells (PSCs). A new series of copolymers with 2,3‐didodecyl‐6,7‐difluoro quinoxaline as the electron‐deficient unit and alkyloxybenzo[1,2‐b:4,5‐b′]dithiophene and thiophene as the electron‐rich unit were synthesized. The photovoltaic properties of the devices based on the synthesized polymers revealed that the fluorine atoms at the quinoxaline units aid in decreasing the highest occupied molecular orbital (HOMO) energy levels; this in turn increased the open circuit voltage of the devices. The polymers with long alkyl chains exhibited good solubility that increased their molecular weight, but the power conversion efficiency was low. Efficient polymer solar cells were fabricated by blending the synthesized copolymers with PC71BM, and the PCE increased up to 5.11% under 100 mW cm−2 AM 1.5 illumination. These results demonstrate that the importance of having a control polymer to be synthesized and characterized side by side with the fluorine analogues. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 1489–1497

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Section: Introductionmentioning

confidence: 99%