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@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 = "24 nov. 2020"
}


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