Defects and metallic contacts involving carbon nanotubes Jisoon Ihm School of Physics, Seoul National University, Korea.

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Presentation transcript:

Defects and metallic contacts involving carbon nanotubes Jisoon Ihm School of Physics, Seoul National University, Korea

Effects of metallic contact on conductance of CNT

(5,5) CNT with a Stone-Wales defect (without metallic electrode)

Atomic model (Au cluster + (5,5) CNT with SW + Au cluster)

Conductance plot with V bias = 0.0 V Fermi level = 0.0 For small voltage (≤ 0.1 V), ideal CNT : 1.0 G 0 (effect of single gold contact: 3 KΩ), CNT with SW : 0.93 G 0

Conductance plot with V bias = 1.0 V ideal CNT : 0.5 G 0 (effect of single gold contact: 10 KΩ) CNT with SW : 0.49 G 0

Conductance plot with V bias = 1.5 V Energy (eV) ideal CNT : 0.5 G 0 (effect of single gold contact: 10 KΩ) CNT with SW : 0.49 G 0

Atomic model (Au cluster + (5,5) CNT with SW + Au cluster)

broad gold electrode narrow gold electrode

Broad gold contact For small voltage (≤ 0.1 V), ideal CNT : 1.6 G 0 (effect of single gold contact: 0.83 KΩ) CNT with SW : 1.55 G 0 For large voltage (~ 1 V), ideal CNT : 0.7 G0 (effect of single gold contact: 6 KΩ) CNT with SW : 0.7 G0 Semiconducting CNT–Gold resistance : 15 K Ω (Ohmic contact) ( McEuen Group, PRL 92, (2004) )

Summary of gold contact Gold contact gives additional resistance of ~ KΩ. Precise contact resistance is sensitive to the contact configuration.