Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups
SCIE
SCOPUS
- Title
- Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups
- Authors
- Junghoon Lee; A-Reum Han; Jayeon Hong; Jung Hwa Seo; Oh, JH; Changduk Yang
- Date Issued
- 2012-10-10
- Publisher
- WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
- 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.
- Keywords
- diketopyrrolopyrrole; ambipolarity; organic field-effect transistor; thermally removable groups; dominant polarity; FIELD-EFFECT TRANSISTORS; THIN-FILM TRANSISTORS; LOW-BAND-GAP; HIGH-PERFORMANCE; ORGANIC SEMICONDUCTORS; SOLAR-CELLS; N-CHANNEL; TRANSPORTING POLYMER; INTEGRATED-CIRCUITS; SOLUBILIZING GROUPS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/14386
- DOI
- 10.1002/ADFM.201200940
- ISSN
- 1616-301X
- Article Type
- Article
- Citation
- ADVANCED FUNCTIONAL MATERIALS, vol. 22, no. 19, page. 4128 - 4138, 2012-10-10
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