Characterization of metallic electrical contacts to SnO2 thin films lightly doped with Eu3+ ions, and photo-induced resistivity
MetadataShow full item record
Lightly Eu3+-doped (0.05%) SnO2 thin films are deposited by the sol-gel-dip-coating technique, topped by alternative metallic layers of Al, Sn or In, arranged in a parallel layout on the thin film surface, and deposited by the resistive evaporation technique. Electrical characterization results show that the sort of deposited metal strongly modifies the device resistance, besides thermally treated metallic layers decreases the device resistivity, which may be associated with increased tunneling probability. Current as function of applied voltage show a good linear symmetry contacts for a large temperature range (30-320 K). However, this feature is due to the MSM (metal-semiconductor-metal) structure of the device, because the conduction through the reversed-biased junction is the main mechanism of electrical transport at Schottky potential barriers. The barrier height evaluation is also presented, considering that the dominant mechanism is the thermionic emission through the reversed-biased junction, yielding values in the range 124 meV for annealed In contacts to 187 meV for untreated Sn contacts. This paper also shows results of photo-induced electrical characteristics under irradiation with below bandgap (450 nm) as well as above bandgap (266 nm) light on the SnO2 thin films, where the surface is coupled with untreated Sn contacts. (c) 2012 Elsevier B.V. All rights reserved.
How to cite this document
Showing items related by title, author, creator and subject.
Pinho, Sheila Zambello de ; Oliveira, José Brás Barreto de ; Gazola, Rodrigo José Cristiano ; Mazotti, Adriano César ; Molero, Camila Schimite ; Mendes, Carolina Borghi ; Mello, Denise Fernandes de ; Marques, Emilia de Mendonça Rosa ; Talamoni, Jandira Liria Biscalquini ; Silva, José Humberto Dias da et al. (Coleção PROGRAD (UNESP), 2011) [Livro]
Pinho, Sheila Zambello de ; Oliveira, José Brás Barreto de ; Pontes, Sueli Rodrigues ; Almeida, Djanira Soares de Oliveira e ; Godoy, Kathya Maria Ayres de ; Rosa, Claudia de Souza ; Nunes, Julianus Araújo ; Salvador, Sérgio Azevedo ; David, Célia Maria ; Vilche Peña, Angel Fidel et al. (Coleção PROGRAD (UNESP), 2011) [Livro]
Pinho, Sheila Zambello de ; Spazziani, Maria de Lourdes ; Mendonça, Sueli Guadelupe de Lima ; Rubo, Elisabete Aparecida Andrello ; Villarreal, Dalva Maria de Oliveira ; Duarte, Camila ; Okamoto, Mary Yoko ; Souza, Thais R. ; Garms, Gilza Maria Zauhy ; Marin, Fátima Aparecida Dias Gomes et al. (Coleção PROGRAD (UNESP), 2012) [Livro]