74 research outputs found
Atomic resolution interface structure and vertical current injection in highly uniform heterojunctions with bulk GaN
The integration of two-dimensional with recently attracted
significant interest for future electronic/optoelectronic applications.
However, the reported studies have been mainly carried out using
heteroepitaxial templates on sapphire substrates, whereas the growth of
on low-dislocation-density bulk GaN can be strategic for the
realization of truly vertical devices. In this paper, we report the growth of
ultrathin films, mostly composed by single-layers (), onto
homoepitaxial on bulk substrates by sulfurization of a
pre-deposited film. Highly uniform and conformal coverage of the
surface was demonstrated by atomic force microscopy, while very low
tensile strain (0.05%) and a significant -type doping () of was evaluated by Raman mapping. Atomic
resolution structural and compositional analyses by aberration-corrected
electron microscopy revealed a nearly-ideal van der Waals interface between
and the -terminated crystal, where only the topmost
atoms are affected by oxidation. Furthermore, the relevant lattice parameters
of the heterojunction, such as the van der Waals gap, were
measured with high precision. Finally, the vertical current injection across
this 2D/3D heterojunction has been investigated by nanoscale current-voltage
analyses performed by conductive atomic force microscopy, showing a rectifying
behavior with an average turn-on voltage under forward bias,
consistent with the expected band alignment at the interface between
doped and .Comment: 21 pages, 6 figure
Monitoraggio degli effetti dell’inquinamento atmosferico sui bambini a sostegno delle strategie di sanità pubblica: il progetto MAPEC_LIFE
Nanostructured CdO thin films for water treatments
CdO was the very first transparent conducting metal oxide discovered. CdO thin films show electrical and optical properties of interest as photosensitive anode materials for photochemical cells, phototransistors, photodiodes, window electrodes in liquid crystal displays, IR detectors, antireflection coatings, gas sensors and in other solar energy applications. In the present study we report on the spectroscopic, microscopic, electrical and photo-catalytic properties of CdO thin films prepared by a metal organic chemical vapor method. The degenerate semiconducting CdO thin films are useful as photocatalysts for water treatments
Direct Atomic Layer Deposition of Ultra-Thin Al2O3 and HfO2 Films on Gold-Supported Monolayer MoS2
Atomic Resolution Interface Structure and Vertical Current Injection in Highly Uniform MoS2 Heterojunctions with Bulk GaN
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