n-Type Field Effect Transistors Based on Rigid Rod and Liquid Crystalline Alternating Copoly(benzobisoxazole) Imides Containing Perylene and/or Naphthalene

Abstract

The synthesis, characterization, and device studies of poly(benzobisoxazole imide)s containing perylene or naphthalene units in an alternating fashion with the oxazole unit are described. Photoinduced energy transfer and charge separation were studied in methanesulfonic acid (MSA) solution via absorption, excitation, and steady-state fluorescence studies. Excitation of the bisoxazole moiety resulted in enhanced emission from the perylene bisimide unit as a result of FRET (Förster resonance energy transfer). The influence of the imide substitution into the linear chain of poly(benzobisoxazole) (PBO) on its solid-state packing was examined by wide-angle X-ray diffraction (WXRD) analysis. Bottom contact field effect transistors (FET) based on thermally annealed polymer films were fabricated and studied. The polymers showed n-type charge transport and current modulation with an on/off ratio greater than 10(2). It was observed that the FETs consisting of the random copolymer of bisoxazole containing both perylene as well as naphthalene bisimide units had higher performance parameters such as better mobility (μ(e)) and I(on)/I(off) ratio compared to those of the pristine systems.

Effect of molecular rigidity and hydrogen bond interaction on mechanical properties of polyimide fibers

“…Based on indexing analysis of molecular simulations by Zhuang Yongbin, the peak at 14.72° (6.01 Å), which attributes to crystal face (002), is derived from “side to side” stacking . Besides, the interplanar spacing of 6.01 Å is similar to interplanar spacing of copoly(benzobisoxazole) imides “side to side” stacking . The peak at 21.98° (4.04 Å) is derived from “face to face” stacking of imide ring or benzoxazole ring, and the interplanar spacing of 4.04 Å is similar to interplanar spacing of “π–π” stacking …”

Electron Transfer and Trapping in Natural p–n Bipolar Polymer-Based Bilayer Films

“…Both NTCDI and PTCDI groups are typical n-type units with the lowest unoccupied molecular orbital (LUMO) work function of about À3.8 eV. 24,32 When the PTCDI group was chlorinated at perylene bay area 1,6,7,12-positions, Cl-atom positions at the Cl 4 DPTD structure (Scheme 1), the tetrachloroperylene diimide LUMO will be À3.9 to À4.0 eV, improved about 0.1À0.2 eV compared with the parent PTCDI. 29 This phenomenon is demonstrated as the first reduction E 1/2 of poly-(Cl 4 DPTD) is about 0.17 V higher than that (À0.52 V) of poly(DNTD) in our case (Table 1).…”

Effects of the acceptor conjugation length and composition on the electrical memory characteristics of random copolyimides

“…6FDA was purchased from TCI and purified by sublimation. PI‐NTCDIX,53 PI‐BTCDIX,54 model compounds for PBI,55 NTCDI,56 BTCDI,54 and 6FDA57 (shown in Scheme ) were synthesized according to the previous reports. AMTPA was kindly donated by JSR Corp. PI‐PBIX was synthesized according to our previous report 17…”