title: High-performance triisopropylsilylethynyl pentacene transistors via spin coating with a crystallization-assisting layer.
abstract: The effects of spin speed and an amorphous fluoropolymer (CYTOP)-patterned substrate on the crystalline structures and device performance of triisopropylsilylethynyl pentacene (TIPS-PEN) organic field-effect transistors (OFETs) were investigated. The crystallinity of the TIPS-PEN film was enhanced by decreasing the spin speed, because slow evaporation of the solvent provided a sufficient time for the formation of thermodynamically stable crystalline structures. In addition, the adoption of a CYTOP-patterned substrate induced the three-dimensional (3D) growth of the TIPS-PEN crystals, because the patterned substrate confined the TIPS-PEN molecules and allowed sufficient time for the self-organization of TIPS-PEN. TIPS-PEN OFETs fabricated at a spin speed of 300 rpm with a CYTOP-patterned substrate showed a field-effect mobility of 0.131 cm(2) V(-1) s(-1), which is a remarkable improvement over previous spin-coated TIPS-PEN OFETs.
authors.affiliation: Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea.
authors.forename: Danbi
authors.initials: D
authors.lastname: Choi
authors.forename: Byungcheol
authors.initials: B
authors.lastname: Ahn
authors.forename: Se Hyun
authors.initials: SH
authors.lastname: Kim
authors.forename: Kipyo
authors.initials: K
authors.lastname: Hong
authors.forename: Moonhor
authors.initials: M
authors.lastname: Ree
authors.forename: Chan Eon
authors.initials: CE
authors.lastname: Park