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APPLIED PHYSICS LETTERS
Volume 92, Issue 24, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.2949742
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We have studied photocurrent generation in large carbon nanotube (CNT) films using electrodes with different spacings. We observe that the photocurrent depends strongly on the position of illumination, with maximum observed response occurring upon illumination at the electrode edges. The rate of change of the response decays exponentially, with the fastest response occurring for samples with the smallest electrode spacing. We show that the time response is due to charge-carrier diffusion in low-mobility CNT films. (c) 2008 American Institute of Physics.
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