TY - JOUR
T1 - Inversion of dominant polarity in ambipolar polydiketopyrrolopyrrole with thermally removable groups
AU - Lee, Junghoon
AU - Han, A. Reum
AU - Hong, Jayeon
AU - Seo, Jung Hwa
AU - Oh, Joon Hak
AU - Yang, Changduk
PY - 2012/10/10
Y1 - 2012/10/10
N2 - 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 × 10 -2 cm 2 V -1 s -1 and 2.63 × 10 -3 cm 2 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 °C. The solution-sheared films upon subsequent thermal treatment show superior electron mobility (μ e = 4.60 × 10 -2 cm 2 V -1 s -1), while the hole mobility decreases by one order of magnitude (μ h = 4.30 × 10 -3 cm 2 V -1 s -1). The inverter constructed with the combination of two identical ambipolar OFETs exhibits a gain of ∼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. 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 dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 °C.
AB - 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 × 10 -2 cm 2 V -1 s -1 and 2.63 × 10 -3 cm 2 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 °C. The solution-sheared films upon subsequent thermal treatment show superior electron mobility (μ e = 4.60 × 10 -2 cm 2 V -1 s -1), while the hole mobility decreases by one order of magnitude (μ h = 4.30 × 10 -3 cm 2 V -1 s -1). The inverter constructed with the combination of two identical ambipolar OFETs exhibits a gain of ∼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. 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 dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 °C.
KW - ambipolarity
KW - diketopyrrolopyrrole
KW - dominant polarity
KW - organic field-effect transistor
KW - thermally removable groups
UR - http://www.scopus.com/inward/record.url?scp=84867094261&partnerID=8YFLogxK
U2 - 10.1002/adfm.201200940
DO - 10.1002/adfm.201200940
M3 - Article
AN - SCOPUS:84867094261
SN - 1616-301X
VL - 22
SP - 4128
EP - 4138
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 19
ER -