【摘 要】
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Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties,where the central unit,fused thienobenzene-thienothiphene (IHBT),is attached with the strong electron-deficient 2-(5,
【机 构】
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Department of Chemistry, Capital Normal University, Beijing 100048, China;Department of Materials Sc
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Small molecule ladder-type heteroarenes IHBT-2F is designed and synthesized with strong electrondonating and molecular packing properties,where the central unit,fused thienobenzene-thienothiphene (IHBT),is attached with the strong electron-deficient 2-(5,6-difluoro-3-oxo-2,3-dihydro-1H-inden-1-ylidene)malononitrile (2FIC) as the end group.The counterpart IDBT-2F with indancenodibenzothiophene (IDBT) mainchain is sythesized for comparison,in which thieno[3,2-b]thiophene (TT) core of IHBT is replaced by benzene core.Relative to benzene-core IDBT-2F,TT-core IHBT-2F shows a much higher high-est occupied molecular orbital energy level (IHBT-2F:-5.46eV;IDBT-2F:-5.72eV) and significantly redshifted absorption,due to the π-donor capability of the sulfur atom,the larger π-conjugation and stronger intermolecular π-π stacking.The as-cast organic solar cells (OSCs) based on blends of PTB7-Th donor and IHBT-2F acceptor without additional treatments exhibit power conversion efficiencies (PCEs)as high as 8.74％,which is much higher than that of PTB7-Th: IDBT-2F (6.73％).
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