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Issue 3, 2011
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Ladder-type heteroacene polymers bearing carbazole and thiophene ring units and their use in field-effect transistors and photovoltaic cells

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Abstract

A family of ladder-type π-excessive conjugated monomer (dicyclopentathienocarbazole (DCPTCz)) integrating the structural components of carbazole and thiophene into a single molecular entity is synthesized and polymerized by oxidative coupling to yield poly(dicyclopentathienocarbazole) (PDCPTCz). Moreover, through the careful selection of 2,1,3-benzothiadiazole unit as a π-deficient building block, the dicyclopentathienocarbazole-based donor–acceptor copolymer (poly(dicyclopentathienocarbazole-alt-2,1,3-benzothiadiazole) (PDCPTCz-BT)) is prepared by Suzuki polycondensation. The optical, electrochemical, and field-effect charge transport properties of the resulting polymers (PDCPTCz and PDCPTCz-BT) are not only characterized in detail but also their bulk-heterojunction (BHJ) solar cell in combination with PC71BM are evaluated. The values of field-effect mobility (µ) for PDCPTCz and PDCPTCz-BT are 8.7 × 10−6 cm2 V−1s−1 and 2.7 × 10−4 cm2 V−1s−1, respectively. A power conversion efficiency (PCE) of 1.57% is achieved on the PDCPTCz-BT/PC71BM device, implying that the push–pull copolymers based on ladder-type dicyclopentathienocarbazole as an electron-donating moiety are promising for organic electronic devices.

Graphical abstract: Ladder-type heteroacene polymers bearing carbazole and thiophene ring units and their use in field-effect transistors and photovoltaic cells

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Publication details

The article was received on 15 Jun 2010, accepted on 08 Oct 2010 and first published on 08 Nov 2010


Article type: Paper
DOI: 10.1039/C0JM01897J
Citation: J. Mater. Chem., 2011,21, 843-850
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    Ladder-type heteroacene polymers bearing carbazole and thiophene ring units and their use in field-effect transistors and photovoltaic cells

    R. K. Cheedarala, G. Kim, S. Cho, J. Lee, J. Kim, H. Song, J. Y. Kim and C. Yang, J. Mater. Chem., 2011, 21, 843
    DOI: 10.1039/C0JM01897J

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