4.2 Article

The Influence of Electron Deficient Unit and Interdigitated Packing Shape of New Polythiophene Derivatives on Organic Thin-Film Transistors and Photovoltaic Cells

Journal

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 49, Issue 13, Pages 2886-2898

Publisher

WILEY
DOI: 10.1002/pola.24724

Keywords

conjugated polymers; crystallization; photovoltaic cells; thin-films; transistors

Funding

  1. KISCO
  2. Ministry of Commerce, Industry, and Energy of the Korean Government [F0004011-2009-32]
  3. Minstery of Education, Science and Technology [2009-0093818]
  4. National Research Foundation of Korea [2009-0093818] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A series of new polythiophene derivatives containing a thiazole ring as an electron deficient unit were successfully synthesized via Stille coupling reactions. Synthesized polymers were classified into two types (H-shape packing and A-shape packing) based on their interdigitated packing structure induced by different side chain configurations. The thiophene derivatives that contained a thiazole unit (PT50Tz50, PTz100, and PTTz) exhibited much better thermal stability than did the full thiophene polymers (PT100 and PTT). The polymers containing the thiazole unit (PTz100 and PTTz) showed a red-shifted absorption spectrum with clear vibronic structure. In addition, the XRD and AFM results showed that the polymers containing the thiazole unit and interdigitated H-shape exhibited much better ordered and connected intermolecular structures than did other polymers. The improved intermolecular ordering and surface morphologies directly facilitated charge carrier transport in thin film transistor (TFT) devices, without introducing charge traps, and yielded higher solar cell performance. Among these polymers, the PTTz copolymer exhibited the best TFT performance (mu = 0.050 cm(2) V-1 s(-1), on/off ratio = 10(6), and V-th = -2 V) and solar cell performance (PCE = 1.39%, J(sc) = 6.58 mA cm(-2), and V-oc = 0.58 V). (C) 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 2886-2898, 2011

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