** Selected as a Highlight in Nanoletters, Mar. 2011 **
- Title :'Small Hysteresis Nanocarbon-Based Integrated Circuits on Flexible and Transparent
Plastic Substrate'
- Author : Woo Jong Yu, Si Young Lee, Sang Hoon Chae, David Perello, Gang Hee Han, Minhee Yun and
Young Hee Lee
- Abstrat : We report small hysteresis integrated circuits by introducing monolayer graphene for the electrodes and a singlewalled carbon nanotube network for the channel. Small hysteresis of the device originates from a defect-free graphene surface, where hysteresis was modulated by oxidation. This uniquely combined nanocarbon material device with transparent and flexible properties shows remarkable device performance; subthreshold voltage of 220 mV decade-1, operation voltage of less than 5 V, n/off ratio of approximately 104, mobility of 81 cm2 V-1 s-1, transparency of 83.8% including substrate, no significant transconductance changes in 1000 times of bending test, and only 36% resistance decrease at a tensile strain of 50%. Furthermore, because of the nearly Ohmic contact nature between the graphene and carbon nanotubes, this device demonstrated a contact resistance 100 times lower and a mobility 20 times higher, when compared to an Au electrode.