Modeling of printed single walled carbon nanotube thin film transistors for attaining optimized clock signals

As all-printed digital circuits are in high demand to produce all-printed active devices, providing accurate and synchronized clocks to all of the printed circuits is an indispensible step. To supply the clock signal to a printed digital circuit, a printed ring oscillator has been considered as a practical solution. However, it is difficult to fully print the ring oscillators with a consistent and stable clock signal. To resolve this problem, we employed single walled carbon nanotube network (SWNTn) as active layers of printed thin film transistors (TFTs) to completely print the ring oscillator. In addition, using the extracted electronic properties from the printed SWNTn-TFTs, we designed a simulation model based on AIM-Spice Model 15 for the printed ring oscillator and compared the simulated clock signals with the experimentally measured values of the printed ring oscillator. (C) 2010 American Institute of Physics. [doi:10.1063/1.3511698]