期刊
CHEMPLUSCHEM
卷 84, 期 9, 页码 1249-1252出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201900260
关键词
direct arylation polycondensation; donor-acceptor copolymers; homocoupling defects; organic solar cells; quaterthiophene-benzothiadiazole copolymers
资金
- Deutsche Forschungsgemeinschaft [RI1551/4-2] Funding Source: Medline
- German Federal Ministry for Education and Research [03EK3529E] Funding Source: Medline
Poly[(2,1,3-benzothiadiazole-4,7-diyl)-alt-4 ',3 ''-difluoro-3,3 '''-di(2-octyldodecyl)-2,2 ';5 ',2 '';5 '',2 '''-quaterthiophene-5,5 '''-diyl)] (PBTff4T-2OD) and poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-3,3 '''-di(2-octyldodecyl)-2,2 ';5 ',2 '';5 '',2 '''-quaterthiophene-5,5 '''-diyl)] (PffBT4T-2OD) for use as the p-donor component of high-efficiency fullerene-based organic solar cells are usually synthesized in established C-C cross-coupling reactions, preferably using the Stille procedure. This report describes how PBTff4T-2OD and PffBT4T-2OD are generated in a direct arylation polycondensation (DAP) approach with molecular weights up to M-n=19.4 kDa and 21.1 kDa, respectively, and how structural defects in the copolymers (e. g., homocoupling defects) show a strong impact on the pre-aggregation behavior. The optimized reaction conditions allow for a distinct reduction of the amount of such defects in the resulting copolymers. When the Stille-type products are used in the active layer of organic solar cells (OCSs) together with fullerene acceptors, high power-conversion efficiencies (PCEs) in the range of 8.6-10.8 % have been reported. The high PCEs are particularly related to the pre-aggregation of the conjugated copolymers prior to film formation. Despite quite similar characterization data, non-optimized OCSs with the DAP polymers as replacement for the Stille products afforded a relatively low power-conversion efficiency of up to 2.4 %.
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