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Jhong-Sian Wu, Yu-Ying Lai, Yen-Ju Cheng, Chih-Yu Chang, Chien-Lung Wang and Chain-Shu Hsu A New sp2-sp2 Dialkylethylene-Bridged Heptacyclic Ladder-Type Arene for High Efficiency Polymer Solar Cells Advanced Energy Materials 3

Article first published online: 22 FEB 2013 | DOI: 10.1002/aenm.201200929

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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.

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