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A New sp 2 ‐sp 2 Dialkylethylene‐Bridged Heptacyclic Ladder‐Type Arene for High Efficiency Polymer Solar Cells
Author(s) -
Wu JhongSian,
Lai YuYing,
Cheng YenJu,
Chang ChihYu,
Wang ChienLung,
Hsu ChainShu
Publication year - 2013
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200929
Subject(s) - moiety , materials science , copolymer , polymer , conjugated system , absorption (acoustics) , carbazole , polymer chemistry , polymer solar cell , coupling (piping) , crystallography , stereochemistry , photochemistry , chemistry , composite material , metallurgy
A new dithienobenzo‐carbazole (DTBC) heptacyclic arene using sp 2 ‐sp 2 dialkylethylene moiety as the bridge was successfully synthesized by Suzuki‐Miyaura cross‐coupling reaction. This facile benzoannulation planarizes the conjugated framework with the concomitant introduction of four octyl substituents, making the newly designed copolymer PDTBCDTBT exhibit solution processability, superior absorption ability, lower‐lying HOMO energy level, and crystalline nature. The solar cell using PDTBCDTBT has produced a high efficiency of 6.2%, which outperforms the corresponding sp 3 ‐hybridized C‐bridged, Si‐bridged and N‐bridged analogous polymers.