Resolving Excitonic and Free Carriers Transitions in Single Wall Carbon Nanotubes Using Field Enhanced Photocurrent Spectroscopy

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.