Synthesis And Characterization Of Perfluoroalkylated Perylene Diimide Based N-type Polymers For Optoelectronic Applications

Abstract

Organic semiconductors gain wide interest in academics and industr y over past two decades due to their vital applications in flexible optoelectronic devices such as organic field effect transistors (OFETs) and organic photovoltaics (OPVs). S tabilit y of the semiconducting materials under different environmental conditions (presence of oxygen, moisture) is impor tant for photovoltaic devices. Although p-t ype organic semiconducting materials are well developed, their counter par ts n-t ype organic semiconductors with optimum air stabilit y and good operational performance are less developed. Per ylene derivatives are well known n-t ype organic semiconductor materials used in variet y of optoelectronic applications. Although per ylene derivatives are good n-t ype semiconductor materials but the devices made of per ylene diimides are lacking stabilit y at operational ambient conditions. Therefore, the design and synthesis of air-stable per ylene diimide based n-t ype materials is an urgent research endeavor in the field of optoelectronics.Here we repor t the synthesis, characterization and optoelectronic proper ties of perfluoroalkylated per ylene diimide based n-t ype pol ymers such as Pol y[9,9-dioct ylfluorene-2,7-diyl-alt-N,N'-di(trifluo romethylphenyl)-3,4,9,10 per ylene diimide-1,7-diyl]. These pol ymers showed three absor ption peaks characteristic of per ylene diimides. We obser ved significant red shif t for thin films of pol ymers when compared to pol ymers in solutions. These pol ymers can have potential applications in flexible pol ymers solar cells as well as in OFETs as electron acceptor materials.