Improving Performance of Pentacene Field-effect Transistors by Optimizing Substrate Temperature and Active Layer Thickness

High performance pentacene-based organic field-effect transistors (OFETs) with different substrates temperatures and film thicknesses were fabricated. The device performance improved visibly the substrate temperature was 69${^\circ}$C and the pentacene film thickness was about 39nm. The field-effect mobility reached as high as 0.42cm$^{\mathbf{2}}$/Vs, the subthreshold swing was 534mV/dec, and the on/off ratio was 10$^{\mathbf{7}}$10$^{\mathbf{8}}$. Electrical properties and film morphology of the device indicate that the substrate temperature affects grain size of the film, and the film thickness affects the trap density of the film.

[1]  Wim Dehaene,et al.  Organic RFID transponder chip with data rate compatible with electronic product coding , 2010 .

[2]  T. Miyamoto,et al.  Extrinsic limiting factors of carrier transport in organic field-effect transistors , 2009 .

[3]  M. Mizukami,et al.  Flexible AM OLED panel driven by bottom-contact OTFTs , 2006, IEEE Electron Device Letters.

[4]  Chanwoo Yang,et al.  Effects of polymer gate dielectrics roughness on pentacene field-effect transistors , 2006 .

[5]  Soeren Steudel,et al.  Influence of the dielectric roughness on the performance of pentacene transistors , 2004 .

[6]  S. P. Tiwari,et al.  Effect of UV irradiation on solution processed low voltage flexible organic field-effect transistors , 2017 .

[7]  Yan-Kuin Su,et al.  Study of organic thin film transistor with polymethylmethacrylate as a dielectric layer , 2007 .

[8]  K. Kudo,et al.  Analysis of barrier height at crystalline domain boundary and in-domain mobility in pentacene polycrystalline films on SiO2 , 2008 .

[9]  Massimo Barbaro,et al.  Active Devices Based on Organic Semiconductors for Wearable Applications , 2010, IEEE Transactions on Information Technology in Biomedicine.

[10]  T. Matsusue,et al.  THz-wave absorption by field-induced carriers in pentacene thin-film transistors for THz imaging sensors , 2013 .

[11]  Robert A. Nawrocki,et al.  Fabrication of poly(3-hexylthiophene) nanowires for high-mobility transistors , 2016 .

[12]  D. Yan,et al.  Organic thin-film transistors with improved characteristics using lutetium bisphthalocyanine as a buffer layer , 2005 .

[13]  Chan Eon Park,et al.  The Effect of Gate‐Dielectric Surface Energy on Pentacene Morphology and Organic Field‐Effect Transistor Characteristics , 2005 .

[14]  K. Kudo,et al.  Conductivity fluctuation within a crystalline domain and its origin in pentacene thin-film transistors , 2007 .

[15]  N. Padma.  Hydrophobic dielectric surface influenced active layer thickness effect on hysteresis and mobility degradation in organic field effect transistors , 2016 .