4.7 Article

Side-chain fluorination on the pyrido[3,4-b]pyrazine unit towards efficient photovoltaic polymers

Journal

SCIENCE CHINA-CHEMISTRY
Volume 61, Issue 2, Pages 206-214

Publisher

SCIENCE PRESS
DOI: 10.1007/s11426-017-9133-5

Keywords

side-chain fluorination; pyrido[3,4-b]pyrazine; efficient photovoltaics

Funding

  1. National Natural Science Foundation of China [51673205, 21506258]
  2. National Key Research & Development Projects of China [2017YFA0206600]
  3. Hunan Provincial Natural Science Foundation for Distinguished Young Scholars [2017JJ1029]
  4. Natural Science Foundation of Hunan Province [2016JJ3134]
  5. Project of Innovation-driven Plan in Central South University, China [2016CX035]
  6. Fundamental Research Funds for the Central Universities of Central South University [2016zzts023]

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A series of new polymer donors (PT-PP, PT-2fPP and PT-4fPP) were synthesized based on alkylthiophene substituted benzodithiophene (BDT-T) and pyrido[3,4-b]pyrazine (PP) building blocks and the effects of fluorination on the polymer properties were explored. Photophysical properties, charge mobilities and morphologies of the three polymers have been intensively investigated. The results indicated that the introduction of the fluorine atom at meta-positions of phenyl substituted PP unit hardly affected their highest occupied molecular orbital (HOMO) level. More importantly, controlling the degree of side-chain fluorination in the polymers is crucial for optimizing the blend morphology. Three polymers showed different photovoltaic properties. The polymer solar cell (PSC) based on the single layer device structure of ITO/PEDOT:PSS/PT-4fPP:PC71BM (1:1, w:w)/ZrAcac/Al demonstrates a high power conversion efficiency (PCE) of 7.61% under the illumination of AM 1.5G, 100 mW cm(-2), which is the highest value for PP-based PSCs.

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