CNFETにおけるhigh-kゲート絶縁膜界面近傍の電荷分布とその影響

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  • Charge distribution near interface of high-k gate insulator in CNFETs

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We have investigated the interface charges generated at the interfaces of the gate insulator in carbon nanotube field-effect transistors (CNFETs) by Kelvin probe force microscopy. It has been found that positive charges are concentrated near the interfaces of the gate insulator with Au electrodes and with a SiO_2 substrate. We have also studied the effect of the positive interface charges on the property of CNFETs, using the device simulation. It has been revealed that the charges at the interface of the gate insulator with the Au electrodes is responsible for the change in the polarity of conduction carriers of CNFETs.

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