Synthesis and Characterization of a 2,4,6‐Tri(2‐thienyl)pyridine‐Based Conjugated Polymer for OFET Applications

Abstract

electrical performance combined with ambient stability. Strategy for improving the ambient stability of thiophene polymers involves decreasing the HOMO energy level of polymers below the threshold for thermodynamically favorable electrochemical oxidation. [ 1d , 2b , 4 ] This strategy can be achieved in several ways such as reducing the electron density of the conjugated polymer by introduction of electrondefi cient monomers, shorting π -electron conjugation along the polymer chain either sterically by reducing π -electron overlap between adjacent repeating units or electronically by introducing repeating units, which hindered delocalization in the backbone. [ 1d , 5 ] However, consideration should be also given in maintaining strong interpolymer interaction and matching of HOMO energy level of polymers with the work function of electrodes for achievement of high fi eld-effect transistor performances.The incorporation of electron-defi cient nitrogencontaining heterocycles into the conjugated backbone can lower the HOMO energy levels of polymers as compared with phenylene or thiophene analogues. [ 6 ] 2,4,6-Trisubstituted pyridine derivatives have been extensively used as building blocks in supramolecular chemistry due to good π -stacking ability, directional H-bonding, and metal coordination properties. [ 6e , 7 ] 2,4,6-Trisubstituted pyridine derivatives with meta-linked aromatic structures Macromol. Chem. Phys. 2012, 213, 917−923Figure 5 . XRD measurements on the thin fi lms of PBDTTPy annealed at at (a) 25, (b) 80, (c) 120, and (d) 160 ° C.

Preventive effects of black tea theaflavins against mouse type IV allergy

“…OFETs are particularly attractive candidates for a broad range of low‐cost, flexible electronic applications, including electronic paper and chemo‐/biosensors 22, 23. Many polymers have been employed for OFET applications,24–26 but no effective WCPs have been found to demonstrate the OFET property. In order to measure the charge‐carrier mobility of the PBTPV, we prepared a simple bottom gate, top contact (BG‐TC) field‐effect transistor.…”

Design, Synthesis, and Application in OFET of a Quinoxaline-Based D-A Conjugated Polymer

“…In the past few years, OFETs have made significant achievements in charge carrier mobility, open-circuit voltage (V oc ), and current on/off ratio. Regarding semiconductor materials, most used are the organic π-conjugated small molecules and polymers ( Cao et al, 2012 ; Donaghey et al, 2013 ; Zhang et al, 2020 ). Compared to small molecules, polymers are more popular and widely used as semiconductor layers in high-performance OFETs, since they are often present not only in high intracharge transport mobility but also in tunable chemical structures ( Kettle et al, 2011 ; Sasikumar et al, 2016 ; Bhanuprakash et al, 2016; Bi et al, 2018 ).…”