Effect of the Active Channel Thickness Variation in Amorphous In–Zn–Sn–O Thin Film Transistor
Ternary oxide thin films in the In2O3–ZnO–SnO2 system were studied for potential applications in oxide semiconductor thin film transistors (TFTs). An amorphous In–Zn–Sn–O (a-IZTO) active channel layer was deposited by RF
magnetron sputtering at room temperature on an n++ Si substrate. Films from a sintered ceramic target with a nominal chemical composition of In:Zn:Sn = 40:50:10 at.% were prepared with thicknesses ranging from 15 nm to 150 nm, which was followed by annealing at 350 °C for 30 minutes
in air. Subsequently, a bilayer Cu/Ti metal contact was deposited as the source/drain electrodes on the top surface through a shadow mask using an e-beam evaporator. The thickness of the active channel layer greatly influenced the characteristics of the oxide thin film transistors. The best
transistor characteristics were observed from the test device with a channel thickness of 30 nm and a high on/off current ratio of approximately 108, high field effect mobility of 25 cm2/Vs, low threshold voltage of −0.1 V, and very small subthreshold swing of 0.14
V/dec.
Keywords: Amorphous Oxide; Channel Thickness; IZTO; In–Zn–Sn–O; RF Magnetron Sputtering; Thin Film Transistor
Document Type: Research Article
Affiliations: 1: School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea 2: School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Publication date: 01 March 2019
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