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Heterostructures in semiconducting nanowires: nanometric light emitters studied by scanning tunnelling microscopy


This project aims to nucleate a research group on optical properties of individual light emitters studied with high spatial and spectral resolution by Scanning Tunnelling Microscopy (STM) in association with a high performance optical system. In this system, local luminescence signals generated by the STM tunnelling current will be employed to study semiconductor nanostructures with sub-nanometer spatial resolution. The objectives of this proposal are the development of a unique instrumental setup in the state-of-the-art and explore its potential in the study of InP, In(Ga)P and GaP heterostructures formed within nanowires, including polymorphism. Nanowires in the III-V group, of great technological interest, has recently revealed new properties and nanometric optical studies, in correlation with Transmission Electron Microscopy (TEM), will unleash faster advances in this knowledge frontier. Effects of phase changes, interfaces, composition gradients and junctions in such heterostructures will be correlated to the nanowires' local and global optical properties. Thus, this project will contribute to the understanding of optical properties of these new materials. This project will also explore, at a later time, other systems of interest, like C-Dots or bidimensional semiconductors (MoS2, BN, among others). (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PENA ROMAN, RICARDO JAVIER; AUAD, YVES; GRASSO, LUCAS; ALVAREZ, FERNANDO; BARCELOS, INGRID DAVID; ZAGONEL, LUIZ FERNANDO. Tunneling-current-induced local excitonic luminescence in p-doped WSe(2)monolayers. NANOSCALE, v. 12, n. 25, p. 13460-13470, JUL 7 2020. Web of Science Citations: 0.
DAS, P.; BLAZIT, J. D.; TENCE, M.; ZAGONEL, L. F.; AUAD, Y.; LEE, Y. H.; LING, X. Y.; LOSQUIN, A.; COLLIEX, C.; STEPHAN, O.; GARCIA DE ABAJO, F. J.; KOCIAK, M. Stimulated electron energy loss and gain in an electron microscope without a pulsed electron gun. ULTRAMICROSCOPY, v. 203, n. SI, p. 44-51, AUG 2019. Web of Science Citations: 4.
RAMOS, RAUL; SCOCA, DIEGO; MERLO, RAFAEL BORGES; MARQUES, FRANCISCO CHAGAS; ALVAREZ, FERNANDO; ZAGONEL, LUIZ FERNANDO. Study of nitrogen ion doping of titanium dioxide films. Applied Surface Science, v. 443, p. 619-627, JUN 15 2018. Web of Science Citations: 5.
DA SILVA, BRUNO C.; OLIVEIRA, DOUGLAS S.; IIKAWA, FERNANDO; COUTO, JR., ODILON D. D.; BETTINI, JEFFERSON; ZAGONEL, LUIZ F.; COTTA, MONICA A. Exploring Au Droplet Motion in Nanowire Growth: A Simple Route toward Asymmetric GaP Morphologies. Nano Letters, v. 17, n. 12, p. 7274-7282, DEC 2017. Web of Science Citations: 2.
KOCIAK, M.; ZAGONEL, L. F. yy Cathodoluminescence in the scanning transmission electron microscope. ULTRAMICROSCOPY, v. 176, n. SI, p. 112-131, MAY 2017. Web of Science Citations: 26.
ZAGONEL, L. F.; TIZEI, L. H. G.; VITIELLO, G. Z.; JACOPIN, G.; RIGUTTI, L.; TCHERNYCHEVA, M.; JULIEN, F. H.; SONGMUANG, R.; OSTASEVICIUS, T.; DE LA PENA, F.; DUCATI, C.; MIDGLEY, P. A.; KOCIAK, M. Nanometer-scale monitoring of quantum-confined Stark effect and emission efficiency droop in multiple GaN/AlN quantum disks in nanowires. Physical Review B, v. 93, n. 20 MAY 6 2016. Web of Science Citations: 10.

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