Electro-optical characterization of in-plane grown carbon nanotubes

Nan Ai; Yao-Tsan Tsai; Qiang Song; Erin Lynn Cochran; Daniel S. Choi; Eui-Hyeok Yang; Stefan Strauf

doi:10.1117/12.817482

11 May 2009 Electro-optical characterization of in-plane grown carbon nanotubes

Nan Ai, Yao-Tsan Tsai, Qiang Song, Erin Lynn Cochran, Daniel S. Choi, Eui-Hyeok Yang, Stefan Strauf

Proceedings Volume 7318, Micro- and Nanotechnology Sensors, Systems, and Applications; 73180Z (2009) https://doi.org/10.1117/12.817482
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

We have fabricated field-effect transistor (FET) structures using arrays of carbon nanotubes (CNTs) as the conducting channel by using chemical vapor deposition to achieve in-plane growth from nanometer-scale Ni dot patterns on the Au/Cr metal electrode pairs as catalyst tips. Detailed studies of the transfer characteristics of the CNT-FETs have been carried out as a function of the number of CNTs bridging the contact gap. Both, ambipolar and unipolar FET behaviors have been observed at room temperature. Devices containing 12 (6) CNTs bridging the gap display CNT-FET on/off ratios of 2 (4), respectively. Best results have been achieved for devices containing 3 semiconducting CNTs displaying pronounced on/off ratios up to 370 at room temperature. In addition, a correlation between source-drain current and optical illumination has been observed, indicating a photoeffect of the CNT arrays. The measured photocurrent depends linearly on the source-drain voltage indicating that the generated electron-hole pairs are effectively separated by the applied bias, making such devices of interest for photovoltaic applications. The demonstrated access to individual CNTs with pronounced semiconducting behavior opens the possibility to form more advanced nanoelectronic structures such as CNT quantum dots with the ultimate goal to realize single electron memory elements operating at room temperature.

Citation Download Citation

Nan Ai, Yao-Tsan Tsai, Qiang Song, Erin Lynn Cochran, Daniel S. Choi, Eui-Hyeok Yang, and Stefan Strauf "Electro-optical characterization of in-plane grown carbon nanotubes", Proc. SPIE 7318, Micro- and Nanotechnology Sensors, Systems, and Applications, 73180Z (11 May 2009); https://doi.org/10.1117/12.817482

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KEYWORDS

Semiconductors

Field effect transistors

Carbon nanotubes

Resistance

Transistors

Electrodes

Nickel

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