6533b7dcfe1ef96bd1272853
RESEARCH PRODUCT
Optical properties of InN nanocolumns: Electron accumulation at InN non‐polar surfaces and dependence on the growth conditions
J. Segura-ruizChristian DenkerA. RizziAndrés CantareroJ. MalindretosFernando IikawaNúria Garrosubject
010302 applied physicsFree electron modelElectron densityPhotoluminescenceCondensed matter physicsAbsorption spectroscopyChemistry02 engineering and technologyElectron021001 nanoscience & nanotechnologyCondensed Matter PhysicsEpitaxy01 natural sciencesMolecular physics0103 physical sciencesPhotoluminescence excitation0210 nano-technologyMolecular beam epitaxydescription
InN nanocolumns grown by plasma-assisted molecular beam epitaxy have been studied by photoluminescence (PL) and photoluminescence excitation (PLE). The PL peak energy was red-shifted with respect to the PLE onset and both energies were higher than the low temperature band-gap reported for InN. PL and PLE experiments for different excitation and detection energies indicated that the PL peaks were homogeneously broadened. This overall phenomenology has been attributed to the effects of an electron accumulation layer present atthe non-polar surfaces of the InN nanocolumns. Variations in the growth conditions modify the edge of the PLE spectra and the PL peak energies evidencing that the density of free electrons can be somehow controlled by the growth parameters. It was observed that In-BEP and substrate temperature leading to shorter In diffusion lengths diminished the effects of the electron accumulation layer on the optical properties. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-05-26 | physica status solidi c |