Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 38, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201700156
Keywords
ladder-type donors; oxygen atoms; photovoltaic properties; pi-pi stacking; twisted conformation
Categories
Funding
- National Natural Science Foundation of China [51403135]
- Zhejiang Provincial Natural Science Foundation of China [LQ17F050002]
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A novel ladder-type donor pyran-bridged indacenodithiophene (IDTP) is developed by introducing two oxygen atoms into indacenodithiophene unit. IDTP possesses a twisted backbone and leads to facially asymmetric arrangement of side chains, resulting in enhanced local pi-pi stacking of according polymer poly[(5,5,11,11-tetrakis(4-octylphenyl)-5,11-dihydrothieno[2', 3': 5,6] pyrano[3,4-g] thieno[3,2-c]isochromene)-alt-4,7-(5-fluoro-2,1,3-benzothiadiazole)] (PIDTP)-FBT, which shows extended absorption range. Moreover, oxygen atoms render deeper highest occupied molecular orbital (HOMO) levels of poly[indacenodithiophene-alt-4,7-(5-fluoro-2,1,3-benzothiadiazole)] (PIDTP)-FBT compared with PIDT-FBT, therefore bringing a higher open-circuit voltage (V-oc).
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