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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab.
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Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups

Author(s)
Lee, JunghoonHan, A-ReumHong, JayeonSeo, Jung HwaOh, Joon HakYang, Changduk
Issued Date
2012-10
DOI
10.1002/adfm.201200940
URI
https://scholarworks.unist.ac.kr/handle/201301/3076
Fulltext
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201200940
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.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
1616-301X
Keyword (Author)
diketopyrrolopyrroleambipolarityorganic field-effect transistorthermally removable groupsdominant polarity

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