NOT and NAND logic circuits composed of top-gate ZnO nanowire field-effect transistors with high-k Al2O3 gate layers

Electrical characteristics of NOT and NAND logic circuits fabricated using top-gate ZnO nanowire field-effect transistors (FETs) with high-k Al2O3 gate layers were investigated in this study. To form a NOT logic circuit, two identical FETs whose I-on/I-off ratios were as high as similar to 10(8) were connected in series in a single ZnO nanowire channel, sharing a common source electrode. Its voltage transfer characteristics exhibited an inverting operation and its logic swing was 98%. In addition, the characteristics of a NAND logic circuit composed of three top-gate FETs connected in series in a single nanowire channel are discussed in this paper.