title: Microstructural control over soluble pentacene deposited by capillary pen printing for organic electronics.
abstract: Research into printing techniques has received special attention for the commercialization of cost-efficient organic electronics. Here, we have developed a capillary pen printing technique to realize a large-area pattern array of organic transistors and systematically investigated self-organization behavior of printed soluble organic semiconductor ink. The capillary pen-printed deposits of organic semiconductor, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS_PEN), was well-optimized in terms of morphological and microstructural properties by using ink with mixed solvents of chlorobenzene (CB) and 1,2-dichlorobenzene (DCB). Especially, a 1:1 solvent ratio results in the best transistor performances. This result is attributed to the unique evaporation characteristics of the TIPS_PEN deposits where fast evaporation of CB induces a morphological evolution at the initial printed position, and the remaining DCB with slow evaporation rate offers a favorable crystal evolution at the pinned position. Finally, a large-area transistor array was facilely fabricated by drawing organic electrodes and active layers with a versatile capillary pen. Our approach provides an efficient printing technique for fabricating large-area arrays of organic electronics and further suggests a methodology to enhance their performances by microstructural control of the printed organic semiconducting deposits.
authors.affiliation: Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Korea.
authors.forename: Wi Hyoung
authors.initials: WH
authors.lastname: Lee
authors.forename: Honggi
authors.initials: H
authors.lastname: Min
authors.forename: Namwoo
authors.initials: N
authors.lastname: Park
authors.forename: Junghwi
authors.initials: J
authors.lastname: Lee
authors.forename: Eunsuk
authors.initials: E
authors.lastname: Seo
authors.forename: Boseok
authors.initials: B
authors.lastname: Kang
authors.forename: Kilwon
authors.initials: K
authors.lastname: Cho
authors.forename: Hwa Sung
authors.initials: HS
authors.lastname: Lee
mesh_terms: D002196:Capillaries / Q000737:chemistry; D002625:Chemistry, Organic; D002722:Chlorobenzenes / Q000737:chemistry; D004581:Electronics; D009279:Naphthacenes / Q000737:chemistry*; D012666:Semiconductors; D014173:Transistors, Electronic
chemical_list: D002722:Chlorobenzenes; D009279:Naphthacenes; C004726:2-dichlorobenzene; C523499:pentacene