Abstract
Two new medium bandgap, alkoxyphenyl substituted thieno[2,3-f]benzofuran (TBFPO) and alkoxyl substituted thieno[2,3-f]benzofuran (TBFP)-based polymers were designed, synthesized and applied in polymer solar cells (PSCs), namely, TBFPO-BDD and TBFO-BDD, respectively. Their thermal, optical, electronic properties and photovoltaic performances were systematically investigated. The PSCs prepared using o-dichlorobenzene as solvent, with the single layer device structure of ITO/PEDOT:PSS/TBFPO-BDD:PC71BM (1:1; w/w)/perylene diimide (PDI) derivative (PDINO)/Al, exhibited a promising power conversion efficiency (PCE) of 6.58% under the illumination of AM 1.5G, 100 mW/cm2, without any post-treatment. While the devices based on TBFO-BDD showed an enhanced PCE of 3.07% with 1 vol% 1,8-diodooctane (DIO) as additive. This study demonstrates that TBFPO-BDD is a promising polymer for organic electronics.
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