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Synthesis and Characterization of Novel D-A Conjugated Polymers Based on Fluorinated Quinoxaline and Thiophene Series for Polymer Solar Cells

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A series of fluorinated quinoxaline-based donor-acceptor alternating copolymers for application in bulk heterojunction polymer solar cells, P2TDFQx, P2TFQx, PTTDFQx, and PTTFQx,were designed and synthesized. The introduction of the electron-withdrawing fluorine atoms to the quinoxaline moiety lowers the highest occupied molecular orbital energy levels of the resulting polymers, which is beneficial for achieving high V OC and long-term stability. The thermal decomposition temperatures (5% weight loss) of these polymers were over 390 °C, indicating excellent thermal stability. Films of these polymers showed broad absorption bands between 350 and 700 nm and low HOMO energy levels ranging from -5.25 to -5.47 eV. PTTDFQx had the highest efficiency in PSCs, with a V OC of 0.70 V, a J SC of 5.51 mA/cm2, and an FF of 0.40, resulting in a PCE of 1.53%.
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Keywords: Fluorine Atom; PSCs; Quinoxaline; Thiophene

Document Type: Research Article

Affiliations: 1: Department of Industrial Chemistry, Pukyong National University, Busan 608-739, Korea 2: Department of Physics, Pukyong National University, Busan 608-739, Korea

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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