Jacket‐like structure of donor–acceptor chromophores‐based conducting polymers for photovoltaic cell applications |
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| Authors: | Yi‐Lung Yang Yi‐Huan Lee Chun‐Jie Chang Ang‐Jhih Lu Wei‐Chun Hsu Leeyih Wang Man‐Kit Leung Chi‐An Dai |
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| Institution: | 1. Institute of Polymer Science and Engineering, National Taiwan University, No. 1, Roosevelt Rd., Sec. 4, Taipei 10617, Taiwan;2. Department of Chemical Engineering, National Taiwan University, No. 1, Roosevelt Rd., Sec. 4, Taipei 10617, Taiwan |
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| Abstract: | Through the Stille coupling polymerization, a series of soluble acceptor/donor quinoxaline/thiophene alternating conducting polymers with a hole‐transporting moiety of carbazole as a side chain ( PCPQT ) has been designed, synthesized, and investigated. The UV–vis measurement of the charge‐transferred type PCPQT s of different molecular weights with low polydispersity exhibits a red shifting of their absorption maximum from 530 to 630 nm with increasing chain length (Mn: from 1100 to 19,200). The HOMO and LUMO energy levels of PCPQT can be determined from the cyclic voltammetry measurement to be ?5.36 and ?3.59 eV, respectively. Solar cells made from PCPQT/PCBM bulk heterojunction show a high open‐circuit voltage, Voc of ～0.75 V, which is significantly higher than that of a solar cell made from conventional poly(3‐hexyl thiophene)/ PCBM as the active polymer PCPQT has lower HOMO level. Further improvements are anticipated through a rational design of the new low band‐gap and the structurally two‐dimensional donor–acceptor conducting polymers. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1607–1616, 2010 |
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| Keywords: | conducting polymers electrochemistry fractionation of polymers structure– property relations UV– vis spectroscopy X‐ray |
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