Inversion of Dominant Polarity in Ambipolar Polydiketopyrrolopyrrole with Thermally Removable Groups

摘要

A narrow bandgap polymeric semiconductor, BOC-PTDPP, comprising aikyl 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 (TCA), 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 intriguingiy, the dominant polarity of charge carriers changes from positive to negative after the thermal cleavage of t-BOC groups at 200 ℃. The solution-sheared films upon subsequent thermal treatment show superior electron mobility (μe = 4.60 × 10~(-2) cm~(-2) V~(-1) s~(-1)), while the hole mobility decreases by one order of magnitude (μh - 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.