Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 41, Pages 20758-20766Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta05901a
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Funding
- NSFC [91433114, 51261130582]
- 973 Program [2011CB808401]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Two novel A-D-A type molecules IDT-2BM and IDTT-2BM with extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) units as cores and strong electron-withdrawing unit 2-(benzo[c][1,2,5]thiadiazol-4-ylmethylene)malononitrile (BM) as the end-capping group were synthesized and investigated as electron acceptors in solution-processed polymer solar cells (PSCs). IDT-2BM and IDTT-2BM exhibited strong and broad absorption from 300 to 800 nm, and appropriate LUMO (-3.8 eV) and HOMO (-5.5 to -5.6 eV) levels matching with the classical polymer donor PBDTTT-C-T. IDT-2BM and IDTT-2BM films exhibited intrinsic electron mobilities of about 3.7 x 10(-6) and 1.0 x 10(-5) cm(2) V-1 s(-1), respectively. Fullerene-free PSCs employing PBDTTT-C-T as the donor and IDT-2BM or IDTT-2BM as the acceptor afforded power conversion efficiencies of 4.26% and 4.81%, respectively.
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