Unraveling the Role of Sn Segregation in the Electronic Transport of Polycrystalline Hematite: Raising the Electronic Conductivity by Lowering the Grain-Boundary Blocking Effect

Soares, Mario R. S.; Costa, Carlos A. R.; Martin Lanzoni, Evandro; Bettini, Jefferson; Ramirez, Carlos A. O.; Souza, Flavio L.; Longo, Elson; Leite, Edson R.

doi:10.1002/aelm.201900065

Reference : Unraveling the Role of Sn Segregation in the Electronic Transport of Polycrystalline ...


	Document type :	Scientific journals : Article
	Discipline(s) :	Engineering, computing & technology : Materials science & engineering
	Focus Areas :	Physics and Materials Science
	To cite this reference:	http://hdl.handle.net/10993/41877

Title :	Unraveling the Role of Sn Segregation in the Electronic Transport of Polycrystalline Hematite: Raising the Electronic Conductivity by Lowering the Grain-Boundary Blocking Effect
Language :	English
Author, co-author :	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 [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]
Publication date :	2019
Journal title :	Advanced Electronic Materials
Volume :	0
Issue/season :	0
Pages :	1900065
Peer reviewed :	Yes
ISSN :	2199-160X
Keywords :	[en] grain boundary ; hematite ; segregation ; semiconductor
Abstract :	[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.
Permalink :	http://hdl.handle.net/10993/41877
DOI :	10.1002/aelm.201900065
Other URL :	https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.201900065
Mentions required by the publisher for OA :	© 2019 WILEY‐VCH Verlag GmbH Co. KGaA, Weinheim

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