Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 18, Pages 7608-7617Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02413
Keywords
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Funding
- Northwestern University MRSEC (NSF) [DMR-1720139]
- AFOSR [FA9550-18-1-0320]
- MRSEC program [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois
- China Scholarship Council [201806070112, 201708140027]
- Shanxi Province Scholarship Council [20171678]
- National Natural Science Foundation of China [51773185, U1810118, 51503187]
- Key Research and Development Plan of Shanxi Province [201803D421088]
- Flexterra Inc.
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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. LTV 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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