A New sp2-sp2 Dialkylethylene-Bridged Heptacyclic Ladder-Type Arene for High Efficiency Polymer Solar Cells

A new dithienobenzo‐carbazole (DTBC) heptacyclic arene using sp2‐sp2 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 substituen...

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Bibliographic Details
Published in:Advanced energy materials 2013-04, Vol.3 (4), p.457-465
Main Authors: Wu, Jhong-Sian, Lai, Yu-Ying, Cheng, Yen-Ju, Chang, Chih-Yu, Wang, Chien-Lung, Hsu, Chain-Shu
Format: Article
Language:English
Subjects:
Efficiency
field-effect transistors
ladder-type
Photovoltaic cells
polymer solar cells
Solar energy
Online Access:Get full text
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Summary:A new dithienobenzo‐carbazole (DTBC) heptacyclic arene using sp2‐sp2 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 sp3‐hybridized C‐bridged, Si‐bridged and N‐bridged analogous polymers. A novel dithienobenzo‐carbazole (DTBC) heptacyclic arene using sp2‐sp2 dialkylethylene moiety as the bridge is successfully synthesized. This facile benzoannulation planarizes the conjugated framework with the concomitant introduction of four octyl substituents. The solar cell using DTBC‐based polymer (PDTBCDTBT) produces a high efficiency of 6.2%, which outperforms the corresponding sp3‐hybridized C‐bridged, Si‐bridged and N‐bridged analogous polymers.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201200929