2004/04/04 by Derek A. Stewart, D. A. Stewart, François Léonard +1
Engineering · Materials Science · Physics and Astronomy · #Graphene research and applications #Nanowire Synthesis and Applications #Semiconductor materials and interfaces #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.93.107401
published as Phys. Rev. Lett. 93, 107401 (2004) · 5 pages, 4 figures, submitted
arxiv created 2004/04/04 · openalex publication_date 2004/08/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Photocurrents in nanotube p-n junctions are calculated using a nonequilibrium Green function quantum transport formalism. The short-circuit photocurrent displays band-to-band transitions and photon-assisted tunneling, and has multiple sharp peaks in the infrared, visible, and ultraviolet. The operation of such devices in the nanoscale regime leads to unusual size effects, where the photocurrent scales linearly and oscillates with device length. The oscillations can be related to the density of states in the valence band, a factor that also determines the relative magnitude of the photoresponse for different bands.