Carbon Nanotube

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Carbon Nanotube Silicon Heterojunction
Nano-diode and IR Detector Arrays

• Jimmy Xu
• Brown University, USA

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Outline
CNT-Si HJ IR Photocurrent Spectra
Nano-Diode
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A one-size fits-all material?
novel electronic properties.
the highest elastic module, and mechanical
strength that is approximately  200 times
stronger than steel.
excellent chemical and thermal stability.
high chemical (such as lithium) storage capacity.
superconductivity
high thermal conductivity.
promising electron field emission properties.
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A one-size fits-all IR material
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Its great!
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Nanotechnology 17 1843 (2006)
APL , Vol. 83, No. 9 1857 (2003)
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Nano-diode I-V dependence on T
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Nano-diode transition from 1D to 2D
M. Tzolov, J.M. Xu et al,, PRL VOLUME 92, NUMBER
7 075505-1 (2004)
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Nano-diode I-V Characteristics
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Uncooled IR photocurrent response -Time domain
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Spectrum of the infrared photocurrent response
Si
CNT
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Tauc Plot
100K
220K
wave number (cm-1)
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Intensity Dependence consistent with photon
energy limit
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future directions

• As a nano-diode
• Varying diameter and spacing of CNTs.
• Heterointerface
• Rectifying diode antenna
• As an IR detector
• Understanding the mechanism of the photo-current
  generation.
• Introducing dye molecules or quantum dots.
• Varying diameter thus spectral ranges

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Acknowledgment

• Base material development supported by AFOSR,
• IR device research supported by ARO
• Dr. Teng-Fang Kuo
• Dr. Marian Tzolov
• Dr. Aijun Yin
• Dr. Jin Ho Kim
• Chih-Hsun Hsu
• Dr. Daniel Straus