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Carbon Nanotube – Silicon Heterojunction Nano-diode and IR Detector Arrays

Carbon Nanotube – Silicon Heterojunction Nano-diode and IR Detector Arrays. Jimmy Xu Brown University, USA. Outline. CNT-Si HJ IR Photocurrent Spectra Nano-Diode. A one-size fits-all material?. novel electronic properties. .

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Carbon Nanotube – Silicon Heterojunction Nano-diode and IR Detector Arrays

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  1. Carbon Nanotube – Silicon Heterojunction Nano-diode and IR Detector Arrays • Jimmy Xu • Brown University, USA

  2. Outline CNT-Si HJ IR Photocurrent Spectra Nano-Diode

  3. 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.

  4. AAO CNTs SWNT A Rakitin,, C. Papadopoulos, J.M. Xu, Phys. Rev. B 61, 5793 - 5796 (2000) C. R. Physique 4 1155–1158 (2003) A one-size fits-all IR material

  5. NOT so It’s great!

  6. Nanotechnology 17 1843 (2006) APL , Vol. 83, No. 9 1857 (2003)

  7. Nano-diode I-V dependence on T

  8. Nano-diode transition from 1D to 2D M. Tzolov, J.M. Xu et al,, PRL VOLUME 92, NUMBER 7 075505-1 (2004)

  9. n-type p-type Nano-diode I-V Characteristics

  10. Uncooled IR photocurrent response -Time domain

  11. Spectrum of the infrared photocurrent response CNT Si

  12. Tauc Plot 100K 220K wave number (cm-1)

  13. Intensity Dependence – consistent with “photon energy limit”

  14. 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

  15. 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

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