Low-voltage pentacene thin-film transistors with Ta2O5 gate insulators and their reversible light-induced threshold voltage shift
- 21 March 2005
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (13)
- https://doi.org/10.1063/1.1896099
Abstract
We have fabricated pentacene thin-film transistors using Ta2O5 films prepared by magnetron reactive sputtering as gate insulators. These transistors exhibit good electrical characteristics at an operating voltage as low as 5 V, with a field-effect mobility of 0.32cm2∕Vs, an on∕off ratio of 104, and a subthreshold slope of 0.5V∕decade. We have also investigated the optical properties of these transistors and observed a reversible light-induced threshold voltage shift. Under illumination, the threshold voltage shifts towards the positive direction while the field-effect mobility and on∕off ratio remain almost unchanged. In the dark, however, the threshold voltage can slowly be restored to its original state. At a gate voltage of −5V, the transistors show a broadband responsivity of 3.7A∕W after illumination at 60μW∕cm2 for 10 min.Keywords
This publication has 16 references indexed in Scilit:
- Organic thin film transistors: From theory to real devicesJournal of Materials Research, 2004
- Improvement of Characteristics of Organic Thin-Film Transistor with Anodized Gate Insulator by an Electrolyte Solution and Low-Voltage Driving of Liquid Crystal by Organic Thin-Film TransistorsJapanese Journal of Applied Physics, 2004
- Pentacene thin film transistors on inorganic dielectrics: Morphology, structural properties, and electronic transportJournal of Applied Physics, 2003
- Ta2O5 as gate dielectric material for low-voltage organic thin-film transistorsOrganic Electronics, 2002
- Effects of film morphology and gate dielectric surface preparation on the electrical characteristics of organic-vapor-phase-deposited pentacene thin-film transistorsApplied Physics Letters, 2002
- Organic Thin Film Transistors for Large Area ElectronicsAdvanced Materials, 2002
- Anodization and Microcontact Printing on Electroless Silver: Solution-Based Fabrication Procedures for Low-Voltage Electronic Systems with Organic Active ComponentsLangmuir, 2000
- Preparation and properties of tantalum pentoxide (Ta2O5) thin films for ultra large scale integrated circuits (ULSIs) application – A reviewJournal of Materials Science: Materials in Electronics, 1999
- Tantalum pentoxide (Ta2O5) thin films for advanced dielectric applicationsMaterials Science and Engineering: R: Reports, 1998
- Stacked pentacene layer organic thin-film transistors with improved characteristicsIEEE Electron Device Letters, 1997