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ACS Appl Mater Interfaces. 2012 Mar;4(3):1154-7. doi: 10.1021/am201778x. Epub 2012 Feb 15.

Channel-length-dependent transport and photovoltaic characteristics of carbon-nanotube-based, barrier-free bipolar diode.

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  • 1Key Laboratory for the Physics and Chemistry of Nanodevices, Peking University, Beijing 100871, China.


Carbon nanotube (CNT) diodes with different channel length between L = 0.6 μm to 3.5 μm are fabricated on the same tube, and the electric and photovoltaic characteristics are investigated. It is found that although the open voltage of the diode increases rapidly for channel length L less than 1.0 μm, it saturates for longer channel devices. On the other hand, the short circuit current of the diode exhibites a clear peak at intermediate channel length of about 1.5 μm, a large leakage current via tunneling for short channel device and significantly decreased current for long channel device due to the increased recombination and channel resistance. The optimal channel length for a CNT diode in photovoltaic application is thus determined to be about 1.5 μm.

© 2012 American Chemical Society

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