作者：Zhi Wang，Xinming Zhuang，Yao Chen，et al
關鍵字：Organic Transistors， Photopatternable Gate Dielectrics
論文來源：期刊
具體來源：Chemistry of Materials
發表時間：2019年
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 for natural carbohydrates and their use as OTFT gate dielectrics. The effect of the cross-linkable chemical structure on the crosslinking 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 crosslinked dielectric films in the irradiated areas. Using propylene glycol monomethyl ether acetate as the solvent/developer, patterned dielectric films with micrometer size features can be readily fabricated. P- and N-type OTFTs are successfully demonstrated using unpatterned/patterned crosslinked 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 bio-mass derived solvents, are promising for the realization of a more sustainable OTFT technology.