title: Flexible low-voltage polymer thin-film transistors using supercritical CO2-deposited ZrO2 dielectrics.
abstract: The fabrication of low-voltage flexible organic thin film transistors using zirconia (ZrO(2)) dielectric layers prepared via supercritical fluid deposition was studied. Continuous, single-phase films of approximately 30 nm thick ZrO(2) were grown on polyimide (PI)/aluminum (Al) substrates at 250 °C via hydrolysis of tetrakis(2,2,6,6-tetramethyl-3,5-heptane-dionato) zirconium in supercritical carbon dioxide. This dielectric layer showed a high areal capacitance of 317 nF cm(-2) at 1 kHz and a low leakage current of 1.8 × 10(-6) A cm(-2) at an applied voltage of -3 V. By using poly(3-hexylthiophene) (P3HT) as a semiconductor, we have fabricated flexible thin film transistors operating at V(DS) = -0.5 V and V(G) in a range from 0.5 V to -4 V, with on/off ratios on the order of 1 × 10(3) and mobility values higher than 0.1 cm(2)/(V s).
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, USA.
authors.forename: Qingshuo
authors.initials: Q
authors.lastname: Wei
authors.forename: Eunyoung
authors.initials: E
authors.lastname: You
authors.forename: Nicholas R
authors.initials: NR
authors.lastname: Hendricks
authors.forename: Alejandro L
authors.initials: AL
authors.lastname: Briseno
authors.forename: James J
authors.initials: JJ
authors.lastname: Watkins