Title :
Resolving Excitonic and Free Carriers Transitions in Single Wall Carbon Nanotubes Using Field Enhanced Photocurrent Spectroscopy
Author :
Mohite, A.D. ; Nagabhirava, B. ; Bansal, T. ; Shah, H. ; Gopinath, P. ; Sumanasekera, G.U. ; Alphenaar, B.W.
Author_Institution :
Department of Electrical Engineering, University of Louisville, KY, 40292
Abstract :
Excitonic and free carrier transitions in single wall carbon nanotubes are distinguished using field enhanced photocurrent spectroscopy. Electric field ionization allows for the detection of bound exciton states that otherwise would not contribute to the photocurrent. Excitonic states associated with the ground state semiconductor are resolved. The results are modeled using the Fowler-Nordheim tunneling.
Keywords :
Displcament photocurrent technique Fowler-Nordheim tunneling; Excitonic; Free-Carrier; Carbon nanotubes; Current measurement; Energy measurement; Excitons; Optical films; Optical pumping; Optical sensors; Photoconductivity; Pulse amplifiers; Spectroscopy; Displcament photocurrent technique Fowler-Nordheim tunneling; Excitonic; Free-Carrier;
Conference_Titel :
Nanotechnology, 2006. IEEE-NANO 2006. Sixth IEEE Conference on
Print_ISBN :
1-4244-0077-5
DOI :
10.1109/NANO.2006.247754
