High-performance solution-processed triisopropylsilylethynyl pentacene transistors and inverters fabricated by using the selective self-organization technique

Abstract

To obtain selectively self-organized active layers of organic field-effect transistors (OFETs) and inverters from a solution-phased triisopropylsilylethynyl pentacene (TIPS-PEN) semiconductor, we locally patterned an oxide dielectric, covered with a hydrophobic fluoropolymer, using O(2) plasma etching. Drop-cast TIPS-PEN molecules were selectively crystallized on the O(2)-plasma-etched area, where a hydrophilic oxide surface was produced. Modification of the patterned oxide dielectrics with hexamethyldisilazane led to a field-effect mobility of the TIPS-PEN OFETs of 0.185 cm(2) V(-1) s(-1), a substhreshold swing of 0.738 V/decade and an on/off ratio of 10(7). Moreover, an inverter composed of two of these OFETs showed good device operation and inverter gain of 5.6. (c) 2008 American Institute of Physics.