Synthesis And Properties Of Novel Functional Organic Field-effect Transistor Materials Based On Isoindigo Polymers

Conjugated polymers have developed speedily due to their promising applicationin low-cost, lightweight, and flexible electronics. The development of the conjugatedpolymers largely improved the device performance in field-effect transistor (FETs)and organic solar cells (OSCs). However, for further improvement of deviceperformance, scientists need to develop new building blocks, in particularelectron-deficient, and gain in-depth knowing of the structure-property relationships.Recently, isoindigo has been used as a new acceptor of conjugated polymers. Iso-indigo has two lactam rings and exhibits strong election-withdrawing character, itselectron deficiency show isoindigo-based polymers superior properties, such as broadabsorption and high open circuit voltage in OSCs, as well as high mobility and goodambient stability in FETs.In this paper, a series of new platinum alkynyl conjugated polymers and modelcompounds based on isoindigo were designed and synthesized, and isoindigo-basedorganic were synthesized by Stille Reaction. The structural, thermal, optical, andelectrochemical properties of the organic material have been characterized. The maincontents of thesis：1. A series of metal-conjugated polymer (P1-P4) and their model compound(S1-S4) based on isoindigo acceptor moiety have been synthesized and characterized.These organic semiconductor materials exhibited good solubility and thermal property,and broad absorption (500~750nm), the optical band gap of the polymer and modelcompounds were1.66-1.78eV and1.48-1.88eV, respectively. With increasingthiophene rings, study have shown that the spectra of polymers and model compoundsadded and the band gap reduced.2. The synthesis and characterization of four isoindigo-based organic polymers(P5-P8) was showed. The relevant thermal, optical and electrochemical propertieswere discussed. These polymers exhibited no better solubility and great stabilitythermal (5%weight loss temperature were above320oC). Further investigate theeffect on optical, electronic and device properties of organic semiconductor materialsthrough the incorporation of Pt atom, and understand the relationship betweenstructure and properties of organic semiconductor materials based on metal platinum.