Amorphous IZO TTFTs with saturation mobilities exceeding 100 cm2/Vs

In this paper we demonstrate the use of amorphous binary In₂O₃–ZnO oxides simultaneously as active channel layer and as source/drain regions in transparent thin film transistor (TTFT), processed at room temperature by rf sputtering. The TTFTs operate in the enhancement mode and their performances are thickness dependent. The best TTFTs exhibit saturation mobilities higher than 10² cm²/Vs, threshold voltages lower than 6 V, gate voltage swing of 0.8 V/dec and an on/off current ratio of 10⁷. This mobility is at least two orders of magnitude higher than that of conventional amorphous silicon TFTs and comparable to or even better than other polycrystalline semiconductors. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)