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- Title
Polymers with Alkylsulfanyl Side Chains for Bulk Heterojunction Solar Cells: Toward a Greener Strategy.
- Authors
Tassinari, Francesco; Libertini, Emanuela; Parenti, Francesca; Ballarin, Barbara; Nicola, Francesco Paolo Di; Lanzi, Massimiliano; Mucci, Adele
- Abstract
The synthesis and properties of three copolymers obtained through a Knoevenagel polycondensation are reported. They are soluble in organic solvents, filmable, and solvatochromic. They are characterized through gel permeation chromatography, NMR and UV-vis spectroscopies, cyclic voltammetry, and atomic force microscopy. They display some proneness to form p-stacks, broad absorptions up to about 700 nm, highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies that fit those of [6,6]-phenyl-C61-butyric acid methyl ester ([60]PCBM). The polymers are incorporated in blends with PCBM within bulk heterojunction devices. The best results are found for polymer solar cells obtained from P1 (2.7% power conversion efficiency). The insertion of alkylsulfanyl chains improves the photovoltaic performances, with respect to those of alkyl-substituted analogous polymers. The Jsc of the devices are greatly enhanced, supporting the employment of (alkylsulfanyl)thienyl units as base units in photoactive materials.
- Subjects
SUBSTITUENTS (Chemistry); HETEROJUNCTIONS; ALKYL compounds; SOLAR cells; POLYCONDENSATION; NUCLEAR magnetic resonance spectroscopy
- Publication
Macromolecular Chemistry & Physics, 2017, Vol 218, Issue 16, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700111