2026-06-08T23:15:41Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1241352025-09-20T00:11:25Zcom_20.500.14352_14col_20.500.14352_15

Defect identification in monolayer MoTe2 through tunneling tip-induced charging and theoretical analysis Casado Aguilar, Pablo Pisarra, Michele Calleja, Fabian Díaz Blanco, Cristina Martín García, Fernando Lopez Vazquez De Parga, Amadeo Garnica, Manuela Defects in transition metal dichalcogenides (TMDs) are pivotal in modulating their electronic, optical, and catalytic properties. Investigating these defects is essential for advancing both fundamental knowledge and practical applications. In this study, we examine the individual defects in a monolayer of MoTe2 supported on graphene grown on an Ir(111) substrate by means of scanning tunneling microscopy (STM). Charging rings appear at distinct bias voltages, revealing ionization levels of doping centers located either below or above the Fermi level. Although direct STM visualization of point defects was not achieved, the combination of scanning tunneling spectroscopy (STS) and density functional theory (DFT) calculations enabled the identification of the structural origins of the charge states. Our results demonstrate a powerful tool for uncovering the electronic and structural characteristics of atomic-scale defects in MoTe2, contributing to the understanding of defect-driven electronic properties in transition metal dichalcogenides. 2025-09-19T09:04:54Z 2025-09-19T09:04:54Z 2025-08-03 journal article P. Casado, M. Pisarra, F. Calleja, C. Díaz, F. Martín, A. L. Vázquez de Parga and M. Garnica. Nanoscale Adv., 2025, 7, 5637–5645 10.1039/d5na00501a https://hdl.handle.net/20.500.14352/124135 https://doi.org/10.1039/D5NA00501A https://pubs.rsc.org/en/content/articlelanding/2025/na/d5na00501a eng info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-096955-B-C44/ES/SIESTA Y SU INTEROPERABILIDAD PARA LOS NUEVOS RETOS EN SIMULACIONES ATOMISTICAS (SIESTA-CSIC)/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-128011NB-I00/ES/CARACTERIZACION DE EXCITACIONES OPTICAS EN MATERIALES 2D CON RESOLUCION ATOMICA/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-138288NB-C31/ES/DINAMICA ULTRARRAPIDA EN MOLECULAS IONIZADAS Y MATERIALES BIDIMENSIONALES/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2022-138288NB-C33/ES/DINAMICA DE MOLECULAS INTERACCIONANDO CON SUSTRATOS SOLIDOS/ CEX2020-001039-S CEX2018-000805-M CNS2022-135175 RYC2020-029317-I open access Royal Society of Chemistry