Contactless doping characterization of Ga_2O_3 using acceptor Cd probes

Finding suitable p-type dopants, as well as reliable doping and characterization methods for the emerging wide bandgap semiconductor beta-Ga_2O_3 could strongly influence and contribute to the development of the next generation of power electronics. In this work, we combine easily accessible ion imp...

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Detalles Bibliográficos
Autores: Barbosa, Marcelo B., Correia, Joao Guilherme, Lorenz, Katharina, Lopes, Armandina M. L., Oliveira, Gonçalo N. P., Fenta, Abel S., Schell, Juliana, Teixeira, Ricardo, Nogales Díaz, Emilio, Méndez Martín, María Bianchi, Stroppa, Alessandro, Araujo, Joao Pedro
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/72096
Acceso en línea:https://hdl.handle.net/20.500.14352/72096
Access Level:acceso abierto
Palabra clave:538.9
Perturbed-angular-correlation
Gallium oxide
Defects
Dynamics
Bandgap
System
Tool
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
Descripción
Sumario:Finding suitable p-type dopants, as well as reliable doping and characterization methods for the emerging wide bandgap semiconductor beta-Ga_2O_3 could strongly influence and contribute to the development of the next generation of power electronics. In this work, we combine easily accessible ion implantation, diffusion and nuclear transmutation methods to properly incorporate the Cd dopant into the beta-Ga_2O_3 lattice, being subsequently characterized at the atomic scale with the Perturbed Angular Correlation (PAC) technique and Density Functional Theory (DFT) simulations. The acceptor character of Cd in beta-Ga_2O_3 is demonstrated, with Cd sitting in the octahedral Ga site having a negative charge state, showing no evidence of polaron deformations nor extra point defects nearby. The possibility to determine the charge state of Cd will allow assessing the doping type, in particular proving p-type character, without the need for ohmic contacts. Furthermore, a possible approach for contactless charge mobility studies is demonstrated, revealing thermally activated free electrons for temperatures above similar to 648 K with an activation energy of 0.54(1) and local electron transport dominated by a tunneling process between defect levels and the Cd probes at lower temperatures.

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