Synthesis and characterization of a poly(1,3-dithienylisothianaphthene) derivative for bulk heterojunction photovoltaic cells

D.L. Vangeneugden, D.J.M. Vanderzande, J. Salbeck, P.A. Hal, van, R.A.J. Janssen, J.C. Hummelen, C.J. Brabec, S.E. Shaheen, N.S. Sariciftci

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56 Citations (Scopus)

Abstract

The synthesis of a poly(1,3-dithienylisothianaphthene) (PDTITN) derivative obtained via oxidative polymerization of 5,6-dichloro-1,2-bis(3‘-dodecylthienyl)isothianaphthene is described. PDTITN exhibits a band gap of 1.80-1.85 eV. The redox properties of PDTITN were characterized using cyclic voltammetry and spectroelectrochemisty. Photoexcitation of PDTITN results in photoluminescence (PL) in the near-IR region and the formation of a triplet state. In the presence of a methanofullerene (PCBM) as an electron acceptor, PL and triplet formation of PDTITN are quenched. In photovoltaic devices using blends of the polymer with PCBM, the observed incident-photon-to-collected-electron efficiency (IPCE) up to 24% at 400 nm and the 3 orders of magnitude increase of short circuit current as compared to the polymer alone prove the photoactivity of the PDTITN/PCBM blend in the device.
Original languageEnglish
Pages (from-to)11106-11113
JournalJournal of Physical Chemistry B
Volume105
Issue number45
DOIs
Publication statusPublished - 2001

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