Reference : Unraveling the Role of Sn Segregation in the Electronic Transport of Polycrystalline ...
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physics and Materials Science
http://hdl.handle.net/10993/41877
Unraveling the Role of Sn Segregation in the Electronic Transport of Polycrystalline Hematite: Raising the Electronic Conductivity by Lowering the Grain-Boundary Blocking Effect
English
Soares, Mario R. S. [Federal University of São Carlos > Chemistry Department]
Costa, Carlos A. R. [Brazilian Center for Research in Energy and Materials (CNPEM) > Brazilian Nanotechnology National Laboratory (LNNano)]
Martin Lanzoni, Evandro mailto [Brazilian Center for Research in Energy and Materials (CNPEM) > Brazilian Nanotechnology National Laboratory (LNNano)]
Bettini, Jefferson [Brazilian Center for Research in Energy and Materials (CNPEM) > Brazilian Nanotechnology National Laboratory (LNNano)]
Ramirez, Carlos A. O. [Brazilian Center for Research in Energy and Materials (CNPEM) > Brazilian Nanotechnology National Laboratory (LNNano)]
Souza, Flavio L. [Universidade Federal do ABC > Centro de Ciências Naturais e Humanas]
Longo, Elson [Federal University of São Carlos > Chemistry Department]
Leite, Edson R. [Brazilian Center for Research in Energy and Materials (CNPEM) > Brazilian Nanotechnology National Laboratory (LNNano) > > ; Federal University of São Carlos > Chemistry Department]
2019
Advanced Electronic Materials
0
0
1900065
Yes
2199-160X
[en] grain boundary ; hematite ; segregation ; semiconductor
[en] This paper describes the role of SnO2 in the electronic transport of polycrystalline hematite (α-Fe2O3). The proper sintering process allows for freezing of a state of electronic defects, in which the electrical properties of hematite are controlled by the grain boundary and Sn segregation. Impedance spectroscopy and dc conductivity measurements show that current flows through preferential pathways associated with Sn segregation that occurs at the grain boundary, leading to a decrease in grain-boundary resistance. Atomic force microscopy and electric force microscopy measurements confirm the results of the impedance analysis. The identification of preferential grain boundaries for electrical conductivity may have a direct influence on the light-induced water-splitting performance of the hematite photoanode.
http://hdl.handle.net/10993/41877
10.1002/aelm.201900065
https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201900065
© 2019 WILEY‐VCH Verlag GmbH Co. KGaA, Weinheim

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