Carbazole-based ladder-type heptacylic arene with aliphatic side chains leading to enhanced efficiency of organic photovoltaics

Yen Ju Cheng, Jhong Sian Wu, Ping I. Shih, Chih Yu Chang, Pei Chi Jwo, Wei Shun Kao, Chain Shu Hsu

研究成果: 雜誌貢獻文章同行評審

107 引文 斯高帕斯(Scopus)

摘要

By utilizing Friedel-Crafts cyclization, we have successfully designed and synthesized a ladder-type heptacyclic carbazole-dicyclopentathiophene (CDCT-C8) unit in which two outer thiophene subunits are covalently fastened to the central 2,7-carbazole core. The nitrogen-directing effect of the carbazole unit facilitates the intramolecular cyclization and thereby suppresses the acid-induced dehydration, allowing us to incorporate two octyl side chains on the cyclopentadiene rings in good chemical yield. The distannyl-CDCT-C8 building block was copolymerized with benzothiadiazole (BT), dithienylbenzothiadiazole (DTBT), dithienyldiketopyrrolopyrrole (DTDPP) and quinoxaline (QX) units by Stille polymerization to afford four alternating donor-acceptor copolymers, PCDCTBT-C8, PCDCTDTBT-C8, PCDCTDTDPP-C8 and PCDCTQX-C8, respectively. The device based on the PCDCTBT-C8:PC71BM (1:3 in wt%) blend exhibited a V oc of 0.74 V, a Jsc of 10.3 mA/cm2, a FF of 60%, delivering an impressive PCE of 4.6%. This value represents one of the best performances among carbazole-based conjugated polymers in the literatures. The corresponding PCDCTBT-C8:PC71BM blend showed a high hole mobility of 1.2 ×10-3 cm2 V-1 s-1, which is in good agreement with its high current density and fill factor. This improved performance is associated with the modification of the aliphatic side chains on the CDCT structure to optimize the interchain interactions for enhanced charge transporting. The devices based on PCDCTDTBT-C8, PCDCTDTDPP-C8 and PCDCTQX-C8 polymers also displayed promising efficiencies of 3.5%, 2.4%, and 1.8%, respectively.
原文英語
頁(從 - 到)2361-2369
頁數9
期刊Chemistry of Materials
23
發行號9
DOIs
出版狀態已發佈 - 五月 10 2011
對外發佈

ASJC Scopus subject areas

  • 化學 (全部)
  • 化學工程 (全部)
  • 材料化學

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