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Keynote Lecture

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

Wednesday (23.09.2020)
16:50 - 17:20 Z: Special Symposia I
Part of:

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 [1,2]. 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.

Prof. Flavio Souza
Brazilian Nanotech National Lab
Additional Authors:
  • Dr. Carlos A. R. Costa
    Brazilian Center for Research in Energy and Materials (CNPEM)
  • Dr. Jefferson Bettini
    Brazilian Center for Research in Energy and Materials (CNPEM)
  • Prof. Edson R Leite
    Brazilian Center for Research in Energy and Materials (CNPEM)