Sungkyunkwan Advanced Institute of Nanotechnology, Department of Energy Science, BK21 Physics Division, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan University, Suwon 440-746, South Korea.
Nano Lett. 2011 Mar 9;11(3):1344-50. doi: 10.1021/nl104488z. Epub 2011 Feb 15.
We report small hysteresis integrated circuits by introducing monolayer graphene for the electrodes and a single-walled 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, on/off ratio of approximately 10(4), mobility of 81 cm(2) 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.
我们通过在电极中引入单层石墨烯，在沟道中引入单壁碳纳米管网络，实现了小滞后集成电路。器件的小滞后源于无缺陷的石墨烯表面，其中滞后通过氧化进行调节。这种独特的组合纳米碳材料器件具有透明和灵活的特性，显示出显著的器件性能；亚阈值电压为 220 mV 每 decade(-1)，工作电压低于 5 V，开关比约为 10(4)，迁移率为 81 cm(2) V(-1) s(-1)，包括衬底在内的透明度为 83.8%，在 1000 次弯曲测试中没有明显的跨导变化，在 50%的拉伸应变下仅电阻下降 36%。此外，由于石墨烯和碳纳米管之间的接触具有近乎欧姆接触的性质，与金电极相比，该器件的接触电阻降低了 100 倍，迁移率提高了 20 倍。
