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Author

Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups

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Title
Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups
Author
Lee, JunghoonHan, A-ReumHong, JayeonSeo, Jung HwaOh, Joon HakYang, Changduk
Keywords
Ambipolar; ambipolarity; Diketopyrrolopyrroles; dominant polarity; Drop-cast; Electronically tunable; Fourier transform infrared; Molecular packing structure; Narrow band gap; Polymer thin films; Polymeric semiconductors; Solution deposition; Solution-processed; Tert-butoxycarbonyl (t-BOC); Thermal cleavage; Thermal-annealing; thermally removable groups; UV-vis spectroscopy
Issue Date
201210
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v.22, no.19, pp.4128 - 4138
Abstract
A narrow bandgap polymeric semiconductor, BOC-PTDPP, comprising alkyl substituted diketopyrrolopyrrole (DPP) and tert-butoxycarbonyl (t-BOC)-protected DPP, is synthesized and used in organic field-effect transistors (OFETs). The polymer films are prepared by solution deposition and thermal annealing of precursors featuring thermally labile t-BOC groups. The effects of the thermal cleavage on the molecular packing structure in the polymer thin films are investigated using thermogravimetric analysis (TGA), UV-vis spectroscopy, atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) analysis. Upon utilization of solution-shearing process, integrating the ambipolar BOC-PTDPP into transistors shows p-channel dominant characteristics, resulting in hole and electron mobilities as high as 1.32 x 10-2 cm2 V-1 s-1 and 2.63 x 10-3 cm2 V-1 s-1, which are about one order of magnitude higher than those of the drop-cast films. Very intriguingly, the dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 degrees C. The solution-sheared films upon subsequent thermal treatment show superior electron mobility (mu = 4.60 x 10-2 cm2 V-1 s-1), while the hole mobility decreases by one order of magnitude (mu= 4.30 x 10-3 cm2 V-1 s-1). The inverter constructed with the combination of two identical ambipolar OFETs exhibits a gain of similar to 10. Reported here for the first time is a viable approach to selectively tune dominant polarity of charge carriers in solution-processed ambipolar OFETs, which highlights the electronically tunable ambipolarity of thermocleavable polymer by simple thermal treatment.
URI
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DOI
http://dx.doi.org/10.1002/adfm.201200940
ISSN
1616-301X
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