 Less demanding devices of tens to thousands of SWNTs are more immediately practical.The use of CNT arrays/transistor increases output current and compensates for defects and chirality differences, improving device uniformity and reproducibility.For example, transistors using horizontally aligned CNT arrays achieved mobilities of 80 cm2 V−1 s−1, subthreshold slopes of 140 mV per decade and on/off ratios as high as 105.