title: Differential conductance (dI/dV) imaging of a heterojunction-nanorod.
abstract: Through scanning tunneling spectroscopy, we envisage imaging a heterostructure, namely a junction formed in a single nanorod. While the differential conductance spectrum provides location of conduction and valence band edges, dI/dV images record energy levels of materials. Such dI/dV images at different voltages allowed us to view p- and n-sections of heterojunction nanorods and more importantly the depletion region in such a junction that has a type-II band alignment. Viewing of selective sections in a heterojunction occurred due to band-bending in the junction and is correlated to the density of states spectrum of the individual semiconductors. The dI/dV images recorded at different voltages could be used to generate a band diagram of a pn junction.
authors.affiliation: Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
authors.forename: Biswajit
authors.initials: B
authors.lastname: Kundu
authors.forename: Abhijit
authors.initials: A
authors.lastname: Bera
authors.forename: Amlan J
authors.initials: AJ
authors.lastname: Pal