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Light emission by individual defects in 2D materials

Grant number: 18/08543-7
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2018
Effective date (End): July 31, 2022
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Luiz Fernando Zagonel
Grantee:Ricardo Javier Peña Román
Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:14/23399-9 - Heterostructures in semiconducting nanowires: nanometric light emitters studied by scanning tunnelling microscopy, AP.JP
Associated scholarship(s):20/12480-0 - Single-photon emission from point defects and substrate-induced hot spots in two-dimensional semiconductors: a scanning tunnelling microscopy-induced luminescence study, BE.EP.DR


In this project we aim to study individual defects in bi-dimensional nanostructures and their electronic and optical properties. Indeed, point defects (vacancies, substitutional atoms and associations) have profound effects in the luminescence of hexagonal Boron Nitride (hBN) and on transition-metal chalcogenides (TMDs), like MoS2 e WSe2. In this materials, punctual defects can be used as Single Photon Emitters (SPEs), can increase their quantum efficiency or change their light emission energies. Despite all technological and scientific interest, many open question remains about the role of each particular defect or how to control their density to achieve desired properties. With this aim, we plan to prepare defects in a controlled fashion using low energy ion beams (~150 eV) and to study their morphology, electronic structure and light emission by using high resolution microscopy adapted to optical studies which are Cathodoluminescence in Scanning Transmission Electronic Microscopy and luminescence in Scanning Tunneling microscopy. This methodology will contribute to the advance in the understanding of individual defect in this knowledge frontier. (AU)

Articles published in Pesquisa para Inovação FAPESP about the scholarships:
Research lays foundation for future development of ultraviolet LEDs 
News published in Agência FAPESP Newsletter about the scholarship:
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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, . (18/08543-7, 14/23399-9)
PENA ROMAN, RICARDO JAVIER; POMMIER, DELPHINE; BRETEL, REMI; LOPEZ, LUIS E. PARRA; LORCHAT, ETIENNE; CHASTE, JULIEN; OUERGHI, ABDELKARIM; LE MOAL, SEVERINE; BOER-DUCHEMIN, ELIZABETH; DUJARDIN, GERALD; et al. Electroluminescence of monolayer WS2 in a scanning tunneling microscope: Effect of bias polarity on spectral and angular distribution of emitted light. PHYSICAL REVIEW B, v. 106, n. 8, p. 7-pg., . (18/08543-7, 20/12480-0, 14/23399-9)
ROMAN, RICARDO JAVIER PENA; COSTA, FABIO J. R. COSTA; ZOBELLI, ALBERTO; ELIAS, CHRISTINE; VALVIN, PIERRE; CASSABOIS, GUILLAUME; GIL, BERNARD; SUMMERFIELD, ALEX; CHENG, TIN S.; MELLOR, CHRISTOPHER J.; et al. Band gap measurements of monolayer h-BN and insights into carbon-related point defects. 2D MATERIALS, v. 8, n. 4, . (18/08543-7, 14/23399-9)
DO AMARAL, GABRIELA MOURA; TONON, ISABELA DA COSTA; PENA ROMAN, RICARDO JAVIER; PLATH, HANNAH DE OLIVEIRA; TANIGUCHI, THEO MASSAO; DE LIMA, LUIS HENRIQUE; ZAGONEL, LUIZ FERNANDO; LANDERS, RICHARD; DE SIERVO, ABNER. Epitaxial growth, electronic hybridization and stability under oxidation of monolayer MoS2 on Ag(111). Applied Surface Science, v. 538, . (07/54829-5, 18/08543-7, 16/21402-8, 07/08244-5)
PENA ROMAN, RICARDO JAVIER; BRETEL, REMI; POMMIER, DELPHINE; LOPEZ, LUIS ENRIQUE PARRA; LORCHAT, ETIENNE; BOER-DUCHEMIN, ELIZABETH; DUJARDIN, GERALD; BORISOV, ANDREI G.; ZAGONEL, LUIZ FERNANDO; SCHULL, GUILLAUME; et al. Tip-Induced and Electrical Control of the Photoluminescence Yield of Monolayer WS2. Nano Letters, v. 22, n. 23, p. 8-pg., . (20/12480-0, 14/23399-9, 18/08543-7)
PENA ROMAN, RICARDO JAVIER; AUAD, YVES; GRASSO, LUCAS; PADILHA, LAZARO A.; ALVAREZ, FERNANDO; BARCELOS, INGRID DAVID; KOCIAK, MATHIEU; ZAGONEL, LUIZ FERNANDO. Design and implementation of a device based on an off-axis parabolic mirror to perform luminescence experiments in a scanning tunneling microscope. Review of Scientific Instruments, v. 93, n. 4, p. 18-pg., . (21/06893-3, 18/08543-7, 14/23399-9)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ROMÁN, Ricardo Javier Peña. Investigando as propriedades eletrônicas e ópticas de materiais atomicamente finos com um microscópio de tunelamento com varredura. 2022. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Instituto de Física Gleb Wataghin Campinas, SP.

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