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Surface dielectric tunnel barrier induced by Mn doping in SnO_2 micro- and nanostructures

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Maestre Varea, David and Cremades Rodríguez, Ana Isabel and Herrera, Manuel (2018) Surface dielectric tunnel barrier induced by Mn doping in SnO_2 micro- and nanostructures. Physica status solidi A-applications and materials science, 215 (19). ISSN 1862-6300

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Official URL: http://dx.doi.org/10.1002/pssa.201800275




Abstract

Electrical properties of undoped and Mn doped SnO2 microplates and rods are studied by electron beam induced current (EBIC) in a scanning electron microscope (SEM), and I-V curves acquired at room temperature. AFM measurements reveal the formation of numerous terraces at the (-101) surface of the analyzed Mn-doped SnO2 microplates, which also exhibit high carrier recombination processes at their central region, as confirmed by combined EBIC and cathodoluminescence (CL) measurements. A diffusion length for minority carriers about 205nm is obtained by EBIC measurements. Different electrical conduction mechanisms, such as Fowler-Nordheim, direct tunneling and Poole-Frenkel, are evaluated in the electrical analysis of the samples. Mn doped microplates show lower conductivity than the undoped microds. Moreover the height of the surface tunnel barrier is increased by Mn doping, as confirmed by the analysis of the I-V curves acquired under transversal configuration. A value of the relative dielectric constant E-r about 7.3 is estimated for the probed SnO2 microstructures.


Item Type:Article
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©2018 Wiley
The work was supported by MINECO/FEDER/M-ERA.Net. Cofund projects: MAT 2016-81720-REDC, MAT 2015-65274-R, and PCIN-2017-106. MHZ thanks for the financial support by PAPIIT-UNAM IN101917 project. The authors are grateful to Prof. Javier Piqueras for early attracting our research efforts to the fascinating world of the electronic microscopy related techniques and for assisting us as a dedicated mentor.

Uncontrolled Keywords:Beam-induced current; Grain-boundaries; Oxide; Photoluminescence; Nanowires; Films; Doping; Electron beam induced current; Microplate; SnO2
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:51186
Deposited On:19 Feb 2019 18:01
Last Modified:20 Feb 2019 08:40

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