Articles producció científica> Química Física i Inorgànica

Electronic Properties of Hexagonal V-Shaped Gallium Nitride Pits

  • Identification data

    Identifier: imarina:9335072
  • Authors:

    La Hera, VM
    Mena, J
    Canto-Aguilar, EJ
    Barzegar, HR
    Carvajal, JJ
    Wågberg, T
    Gracia-Espino, E
  • Others:

    Author, as appears in the article.: La Hera, VM; Mena, J; Canto-Aguilar, EJ; Barzegar, HR; Carvajal, JJ; Wågberg, T; Gracia-Espino, E
    Department: Química Física i Inorgànica
    URV's Author/s: Carvajal Martí, Joan Josep
    Keywords: Work function Surface Oxygen-chemisorption Growth Gan
    Abstract: In this work, the morphology, surface composition, and electronic properties of porous GaN films containing hexagonal V-shaped pits were studied. The V-pits are orientated along the [0001] direction of GaN, and we observed a clear relation between the growth time with the surface composition, film thickness, and pit morphology, which in turn had a significant impact on the band gap, valence band maximum, and the work function. The effect on the position of the valence band maximum and work function is explained by the formation of superficial oxygen-rich phases such as Ga2O3 and nonstoichiometric GaNxOy as supported by X-ray photoelectron spectroscopy and density functional theory (DFT). We further show a change in the optical band gap with the thickness of the porous films explained by a change in the tensile strain caused by open-core screw dislocations that gives rise to the formation of V-pits. The correlation between strain and the band gap is supported by DFT calculations. Our study provides insights into the intricate relation between surface states and electronic properties of semiconducting materials and offers directions for designing GaN heterojunctions with specific optical and electronic properties.
    Thematic Areas: Surfaces, coatings and films Química Physical and theoretical chemistry Nanoscience and nanotechnology Nanoscience & nanotechnology Medicina ii Medicina i Materials science, multidisciplinary Materiais Interdisciplinar General energy Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Energy (miscellaneous) Energy (all) Electronic, optical and magnetic materials Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Chemistry, physical Biotecnología Biodiversidade Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: joanjosep.carvajal@urv.cat
    Author identifier: 0000-0002-4389-7298
    Record's date: 2024-07-20
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://pubs.acs.org/doi/full/10.1021/acs.jpcc.3c05878
    Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Journal Of Physical Chemistry c. 127 (51): 24658-24665
    APA: La Hera, VM; Mena, J; Canto-Aguilar, EJ; Barzegar, HR; Carvajal, JJ; Wågberg, T; Gracia-Espino, E (2023). Electronic Properties of Hexagonal V-Shaped Gallium Nitride Pits. Journal Of Physical Chemistry c, 127(51), 24658-24665. DOI: 10.1021/acs.jpcc.3c05878
    Article's DOI: 10.1021/acs.jpcc.3c05878
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2023
    Publication Type: Journal Publications
  • Keywords:

    Chemistry, Physical,Electronic, Optical and Magnetic Materials,Energy (Miscellaneous),Materials Science, Multidisciplinary,Nanoscience & Nanotechnology,Nanoscience and Nanotechnology,Physical and Theoretical Chemistry,Surfaces, Coatings and Films
    Work function
    Surface
    Oxygen-chemisorption
    Growth
    Gan
    Surfaces, coatings and films
    Química
    Physical and theoretical chemistry
    Nanoscience and nanotechnology
    Nanoscience & nanotechnology
    Medicina ii
    Medicina i
    Materials science, multidisciplinary
    Materiais
    Interdisciplinar
    General energy
    Farmacia
    Ensino
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Energy (miscellaneous)
    Energy (all)
    Electronic, optical and magnetic materials
    Ciências biológicas iii
    Ciências biológicas ii
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Chemistry, physical
    Biotecnología
    Biodiversidade
    Astronomia / física
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