Optoelectronic properties of calcium cobalt oxide misfit nanotubes

Lajaunie, L. ; Ramasubramaniam, A. ; Panchakarla, L.S. ; Arenal, R. (Universidad de Zaragoza)

Resumen: We report on the optoelectronic properties of a recently discovered nanotubular phase of misfit-layered calcium cobalt oxide, CaCoO2-CoO2. Individual nanotubes are investigated by spatially resolved electron energy-loss spectroscopy experiments performed in a transmission electron microscope, and complementary first-principles, time-dependent hybrid density-functional theory calculations are performed to elucidate the electronic structure and optical spectra. We find that the band gap is independent of the geometry of the nanotubes, and experimental and calculated results independently confirm an optical gap of 1.9-2.1 eV for the CaCoO2-CoO2 nanotubes. The time-dependent hybrid density-functional theory calculations also suggest the existence of strongly bound intralayer excitons (up to 0.5 eV binding energy), which could allow for optoelectronic applications of these nanotubes at near-infrared to visible (~1.5-2 eV) wavelengths.

Idioma: Inglés

DOI: 10.1063/1.5043544

Año: 2018

Publicado en: APPLIED PHYSICS LETTERS 113, 3 (2018), 031102
ISSN: 0003-6951

Factor impacto JCR: 3.521 (2018)

Categ. JCR: PHYSICS, APPLIED rank: 31 / 148 = 0.209 (2018) - Q1 - T1

Factor impacto SCIMAGO: 1.331 - Physics and Astronomy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/EC/H2020/696656/EU/Graphene-based disruptive technologies/GrapheneCore1
Financiación: info:eu-repo/grantAgreement/EC/H2020/785219/EU/Graphene Flagship Core Project 2/GrapheneCore2
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2016-79776-P

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)