期刊
ADVANCED FUNCTIONAL MATERIALS
卷 24, 期 22, 页码 3432-3437出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201303688
关键词
structure-property relationships; low bandgap polymers; polymers; organic photovoltaics; solar cells
类别
资金
- US National Science Foundation [NSF-SEP-1229089]
- Air Force office of Scientific Research [FA9550-12-1-0061]
- NSF MRSEC program at the University of Chicago
- ANSER Center, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001059]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1230217] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1229089] Funding Source: National Science Foundation
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This new TID unit is identical to the well-known thieno[3,4-c]pyrrole-4,6-dione (TPD) unit except that one carbonyl has been replaced by a sulfonyl group.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 (ge) in the repeating units of the new polymer indicate that the replacement of the carbonyl by a sulfonyl group leads to larger ge 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 ge 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.
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