Photocurrent Amplification at Carbon Nanotube–Metal Contacts


  • We thank the National Science Council of Taiwan for financial support (NSC 93-2113-M-007-028) and UST-CNST project.


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The photocurrent produced at single-walled carbon nanotube–Zn contacts with zero bias is amplified by a factor of 4–7 upon application of a bias (see Figure). Between ± 0.5 mV biases, the ideality factor only deviates slightly, but at biases of larger magnitude, current amplification becomes nonlinear owing to charge accumulation at the interfacial O2 layer.