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Polymers for application in organic solar cells: Bithiophene can work better than thienothiophene when coupled to benzodithiophene

The synthesis and characterization of two low band gap copolymers (P1 and P2) incorporating benzo[1,2-b:4,5-b']dithiophene unit substituted with octylsulfanylthienyl groups (OSBT) are here reported. These materials, designed to be employed in polymer solar cells (PSCs), were obtained from alternatin... Full description

Contained in: Journal of Polymer Science, Part A: Polymer Chemistry Vol. 54, No. 11 (2016), p. 1603-1614
Journal Title: Journal of Polymer Science, Part A: Polymer Chemistry
Fulltext access:
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Links: Additional Link (dx.doi.org)
Additional Keywords: BANDLUECKE
COPOLYMER
ELEKTRON
HETEROUEBERGANG
KONJUGIERTES-POLYMER
ORGANISCHE-SOLARZELLE
ORGANISCHES-LOESUNGSMITTEL
SOLVATOCHROMIE
STOFFGEMISCH
STRUKTUR-EIGENSCHAFT-BEZIEHUNG
DOI: 10.1002/pola.28014
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 12 Seiten
ID (e.g. DOI, URN): 10.1002/pola.28014
PPN (Catalogue-ID): WTI001062735
Note: WTI TEMA DB
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520 |a The synthesis and characterization of two low band gap copolymers (P1 and P2) incorporating benzo[1,2-b:4,5-b']dithiophene unit substituted with octylsulfanylthienyl groups (OSBT) are here reported. These materials, designed to be employed in polymer solar cells (PSCs), were obtained from alternating OSBT and bithiophene (P1) or thienothiophene (P2) units. Their structural electrochemical and photophysical properties were investigated. They are thermally stable and soluble in organic solvents from which they easily form films. They also form π-stacks in solution, in film and display a moderate solvatochromism. These polymers were tested with [70]PCBM in bulk-heterojunction (BHJ) PSCs where they act as donor materials and [70]PCBM is the electron acceptor. The best device, obtained using a 1:3 weight ratio for the P1:[70]PCBM blend, shows a PCE around 1.5%. A broad response from 350 to 700 nm is also observed in the external quantum efficiency (EQE) curves, wider for P1 with respect to P2. [Copyright John Wiley & Sons. Reproduced with permission.] 
653 4 |a KONJUGIERTES-POLYMER 
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950 |a Heteroatom  |a low band gap  |a photophysikalische Eigenschaft  |a Elektronenakzeptor  |a äußerer Quantenwirkungsgrad  |2 DE-601 
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