Journal
POLYMER CHEMISTRY
Volume 2, Issue 5, Pages 1156-1162Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0py00401d
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Funding
- National Natural Science Foundation of China [50825102]
- Lieying Project
- Fundamental Research Funds for the Central Universities [2010QZZD0112]
- Ministry of Education of China [20100162120033]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC
- Chinese Academy of Sciences [PCOM201025]
- State Key Laboratory of Powder Metallurgy
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Three new low bandgap isoindigo-based conjugated polymers were synthesized, namely poly{(N-octyl)-carbazole-2,7-diyl-alt-[N, N'-(2-ethylhexyl)-isoindigo]-6',6 ''-diyl} (PCzID), poly{(9, 9-dioctylfluorene)-2,7-diyl-alt-[N, N'-(2-ethylhexyl)-isoindigo]-6',6-diyl} (PFID), and poly{4,8-bis(2-ethylhexoxy)-benzo[1,2-b, 3,4-b]-dithiophene-2,6-diyl-alt-[N, N'-(2-ethylhexyl)-isoindigo]-6',6 ''-diyl} (PBDTID), by Stille or Suzuki coupling polymerization reaction. All of the polymers were soluble in common organic solvents, such as chloroform, tetrahydrofuran, and chlorobenzene with good film forming properties. The polymer films exhibit broad absorption bands in the wavelength region from 300 nm to 810 nm. Especially, PBDTID possesses the smallest bandgap of 1.54 eV calculated from its absorption cut-off at 806 nm. Preliminary photovoltaic cells based on the device structure of ITO/PEDOT:PSS/PBDTID:PC60BM (1 : 1 w/w)/Ca/Al showed an open-circuit voltage of 0.56 V, a power conversion efficiency of 0.9% and a short circuit current of 3.81 mA cm(-2).
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