| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1441950 | Synthetic Metals | 2011 | 5 Pages |
This study reports the preparation and characterization of polyimide/Ta2O5 nanocomposite films as insulators for organic thin-film transistors (OTFTs). The degree of imidization, thermal, electrical, and surface properties of the nanocomposite films were characterized as a function of Ta2O5 precursor contents. The nanocomposite films, with controlled/comparable insulator electrical characteristics and surface properties, have been found to enhance dielectric constant compared to pristine polyimide films, which resulted in improved pentacene TFT performance by a factor of 2–3 with carrier mobility values as high as 0.38 cm2/V s.
• In situ formation of Ta2O5 nanocomposite polyimide films as insulators was studied. • Films imidization degree was characterized as a function of Ta2O5 precursor contents. • Increase of dielectric constant of these Ta2O5/polyimide films was observed. • Improved pentacene mobility in OTFTs by a factor of 2–3 was achieved. • Good current on/off ratio (>105) and low threshold voltage (−1.5 V) was also obtained.
