Cinnamate-Functionalized Natural Carbohydrates as Photopatternable Gate Dielectrics for Organic Transistors
journal contributionposted on 23.08.2019, 17:36 by Zhi Wang, Xinming Zhuang, Yao Chen, Binghao Wang, Junsheng Yu, Wei Huang, Tobin J. Marks, Antonio Facchetti
Photolithographic-defined films play an important role in modern optoelectronics and are crucial for the development of advanced organic thin-film transistors (OTFTs). Here, we explore a facile photoresist-free photopatterning technique with natural carbohydrates and its use as an OTFT gate dielectric. The effects of the cross-linkable chemical structure on the cross-linking chemistry and dielectric strength of the corresponding films are investigated in cinnamate-functionalized carbohydrates from monomeric (glucose) to dimeric (sucrose) to polymeric (cellulose) backbones. UV illumination of the cinnamate esters of these carbohydrates leads to [2 + 2] cycloaddition and thus the formation of robust cross-linked dielectric films in the irradiated areas. Using propylene glycol monomethyl ether acetate as the solvent/developer, patterned dielectric films with micrometer-sized features can be readily fabricated. P- and N-type OTFTs are successfully demonstrated using unpatterned/patterned cross-linked films as the gate dielectric and pentacene and N,N′-1H,1H-perfluorobutyl dicyanoperylenecarboxydiimide (PDIF-CN2) as the p- and n-channel semiconducting layers, respectively. These results demonstrate that natural-derived polymer gate dielectrics, which are soluble and patternable using biomass-derived solvents, are promising for the realization of a more sustainable OTFT technology.
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cross-linkable chemical structurecross-linked dielectric filmsmicrometer-sized featuresOrganic Transistors Photolithographic-defined filmscinnamate-functionalized carbohydratespropylene glycol monomethyl ether acetatenatural-derived polymer gate dielectricsUV illuminationcross-linking chemistryPDIF-CN 2OTFT gate dielectricdielectric filmsOTFT technologyN-type OTFTsdielectric strengthn-channel semiconducting layersbiomass-derived solventsPhotopatternable Gate Dielectricsgate dielectricthin-film transistorscinnamate estersperfluorobutyl dicyanoperylenecarboxydiimidephotoresist-free photopatterning techniqueCinnamate-Functionalized Natural Carbohydrates