@Article{MöllerOSCIMMLGC:2017:FeEnDe,
author = "M{\"o}ller, M. and Oliveira, D. S. and Sahoo, P. K. and Cotta, M.
A. and Iikawa, F. and Motisuke, Paulo and Molina-S{\'a}nchez, A.
and Lima Junior, M. M. de and Garc{\'{\i}}a-Crist{\'o}bal, A.
and Cantarero, A.",
affiliation = "{Universidade Estadual de Campinas (UNICAMP)} and {Universidade
Estadual de Campinas (UNICAMP)} and {Universidade Estadual de
Campinas (UNICAMP)} and {Universidade Estadual de Campinas
(UNICAMP)} and {Universidade Estadual de Campinas (UNICAMP)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University
of Luxembourg} and {University of Valencia} and {University of
Valencia} and {University of Valencia}",
title = "Fermi energy dependence of the optical emission in core/shell InAs
nanowire homostructures",
journal = "Nanotechnology",
year = "2017",
volume = "28",
number = "29",
pages = "295702",
month = "July",
keywords = "nanowire, InAs, photoluminescence, small band gap,
semiconductor.",
abstract = "InAs nanowires grown by vapor-liquid-solid (VLS) method are
investigated by photoluminescence. We observe that the Fermi
energy of all samples is reduced by similar to 20 meV when the
size of the Au nanoparticle used for catalysis is increased from 5
to 20 nm. Additional capping with a thin InP shell enhances the
optical emission and does not affect the Fermi energy. The
unexpected behavior of the Fermi energy is attributed to the
differences in the residual donor (likely carbon) incorporation in
the axial (low) and lateral (high incorporation) growth in the VLS
and vapor-solid (VS) methods, respectively. The different impurity
incorporation rate in these two regions leads to a core/shell InAs
homostructure. In this case, the minority carriers (holes) diffuse
to the core due to the built-in electric field created by the
radial impurity distribution. As a result, the optical emission is
dominated by the core region rather than by the more heavily doped
InAs shell. Thus, the photoluminescence spectra and the Fermi
energy become sensitive to the core diameter. These results are
corroborated by a theoretical model using a self-consistent method
to calculate the radial carrier distribution and Fermi energy for
distinct diameters of Au nanoparticles.",
doi = "10.1088/1361-6528/aa76bf",
url = "http://dx.doi.org/10.1088/1361-6528/aa76bf",
issn = "0957-4484",
language = "en",
targetfile = "Moller_fermi.pdf",
urlaccessdate = "27 abr. 2024"
}