Articles
  • Electrical characteristics of zinc oxide thin film transistor fabricated at high temperature by RF magnetron sputtering technique
  • M. Amuthasurabia, J. Chandradassb,*, V Ramesh Babuc, P.Baskara Sethupathib and M. Leenus Jesu Martinb
  • a Ph.D Scholar, Center for Nanotechnology, PRIST, Thanjavur, Tamilnadu, India b Centre for Automotive Materials, Department of Automobile Engineering, School of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Kancheepuram 603203, Tamilnadu, India c Department of Materials Science and Engineering, National Institute of Technology, Trichy, Tamilnadu, India
Abstract
We report on the performance of the thin film transistors (TFTs) using ZnO as an active channel layer grown by using radio frequency (rf) magnetron sputtering technique. The TFT device structure used in this study was a bottom gate type, which consists of SiNx as a gate insulator and indium tin oxide (ITO) as a gate deposited onto corning glass substrates. Electrical characteristics of the device showed clear saturation region without any output current degradation due to self heating effect. These ZnO TFTs had a saturation field effect mobility of about 2.14 cm2/Vs, an on to off ratio of greater than 105, the off current of less than 10−10 A and a threshold voltage of 15 V at a maximum device processing temperature of 350 oC. This TFT had a channel width of 300 μm and channel length of 30 μm. Moreover, the SiNx dielectric layer was found to be optimum for the high performance ZnO based TFTs because of the very low leakage current and good interface between the channel layer and gate material

Keywords: ZnO, Transistor, Self heating Effect, Sputtering, Characteristics

This Article

  • 2017; 18(11): 815-818

    Published on Nov 30, 2017