Side-chain effects on phenothiazine-based donor-acceptor copolymer properties in organic photovoltaic devices

Young Hoon Seo, Woo Hyung Lee, Jong Hyeok Park, Cheolbeom Bae, Yongtaek Hong, Jong Wook Park, In Nam Kang

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Abstract

A series of new phenothiazine-based donor-acceptor copolymers, P1 and P2, were synthesized via a Suzuki coupling reaction. The weight-averaged molecular weights (M w) of P1 and P2 were found to be 16,700 and 16,100, with polydispersity indices of 1.74 and 1.39, respectively. The UV-visible absorption spectra of the polymer thin films contained three strong absorption bands in the ranges 318-320 nm, 430-436 nm, and 527-568 nm. The absorption peaks at 320 and 430 nm originated mainly from the phenothiazine-based monomer units, and the longer wavelength absorption band at 527-568 nm was attributed to the increased effective conjugation length of the polymer backbones. Solution-processed field-effect transistors fabricated with these polymers exhibited p-type organic thin film transistor characteristics. The field-effect mobilities of P1 and P2 were measured to be 1.0 × 10 -4 and 7.5 × 10 -5 cm 2 V -1 s -1, respectively, with on/off ratios in the order of 10 4 for all polymers. A photovoltaic device in which a P2/PC 71BM (1/3) blend film was used as the active layer exhibited an open-circuit voltage (V OC) of 0.70 V, a short-circuit current (J SC) of 6.79 mA cm (2, a fill factor of 0.39, and a power conversion efficiency of 1.86% under AM 1.5 G (100 mW cm -2) illumination.

Original languageEnglish
Pages (from-to)649-658
Number of pages10
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume50
Issue number4
DOIs
Publication statusPublished - 2012 Feb 15

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All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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