Tuning the Polarizability in Donor Polymers with a Thiophenesaccharin Unit for Organic Photovoltaic Applications
| Autor: | Luping Yu, Tao Xu, Lin X. Chen, Tianyue Zheng, Jodi M. Szarko, Luyao Lu, Alexander M. Schneider |
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| Rok vydání: | 2014 |
| Předmět: |
chemistry.chemical_classification
Sulfonyl Isothiazole Materials science Organic solar cell Polymer Condensed Matter Physics Acceptor Polymer solar cell Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Polarizability Excited state Electrochemistry Physical chemistry Organic chemistry |
| Zdroj: | Advanced Functional Materials. 24:3432-3437 |
| ISSN: | 1616-301X |
| Popis: | This paper describes the synthesis of low bandgap copolymers incorporating an artificial sweetener derivative, N-alkyl, 3-oxothieno[3,4-d]isothiazole 1,1-dioxide (TID). This new TID unit is identical to the well-known thieno[3,4-c]pyrrole-4,6-dione (TPD) unit except that one carbonyl has been replaced by a sulfonyl group. Semi-empirical calculations on the local dipole moment change between ground and excited states (Δμge) in the repeating units of the new polymer indicate that the replacement of the carbonyl by a sulfonyl group leads to larger Δμge values. The resulting polymers exhibit a diminished power-conversion efficiency (PCE) compared to a bulk heterojunction (BHJ) solar cells with PC71BM as an acceptor, which extends the correlation between PCE and Δμge of single repeating units in p-type polymers to a new regime. Detailed studies show that the strongly electron-withdrawing sulfonyl group is detrimental to charge separation in alternating copolymers containing a TID unit. |
| Databáze: | OpenAIRE |
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