We report photocurrent generation in entangled networks of multiwall-carbon nanotubes (MWCNTs) grown on TiN/Si substrates by an all-laser process. By integrating these MWCNTs into planar devices, we demonstrate that they generate photocurrent over all the visible and near-ultraviolet range, with maximum efficiency around 420 nm. Photocurrent is obtained even at zero applied voltage, pointing to a true photovoltaic (PV) effect. The extracted photocurrent as a function of applied voltage exhibits nonlinear behavior for voltages , suggesting that the devices do not behave as pure photoresistances. Other mechanisms (e.g., Schottky barriers imbalance) are invoked to describe current flow in these PV devices.
Photocurrent generation in random networks of multiwall-carbon-nanotubes grown by an “all-laser” process
M. A. El Khakani, V. Le Borgne, B. Aïssa, F. Rosei, C. Scilletta, E. Speiser, M. Scarselli, P. Castrucci, M. De Crescenzi; Photocurrent generation in random networks of multiwall-carbon-nanotubes grown by an “all-laser” process. Appl. Phys. Lett. 24 August 2009; 95 (8): 083114. https://doi.org/10.1063/1.3211958
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