TY - JOUR
T1 - Non-linear current-voltage characteristics related to native defects in SrTiO3 and ZnO bicrystals
AU - Sato, Yukio
AU - Tanaka, Tomohito
AU - Oba, Fumiyasu
AU - Yamamoto, Takahisa
AU - Ikuhara, Yuichi
AU - Sakuma, Taketo
N1 - Funding Information:
This study was financially supported by a Grant-in-Aid for Scientific Research (B)(2)-15360363 and on Priority Areas (B)(2)-12130202 from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2003/11
Y1 - 2003/11
N2 - SrTiO3 and ZnO bicrystals with various types of boundaries were fabricated in order to examine their current-voltage characteristics across single grain boundaries. Their grain boundary structures were also investigated by high-resolution transmission electron microscopy. In Nb-doped SrTiO 3, electron transport behaviors depend on the type of boundaries. Random type boundaries exhibit highly non-linear current-voltage characteristics, while low angle boundaries show a slight non-linearity. On the contrary, undoped ZnO does not exhibit non-linear current-voltage characteristics in any type of boundaries including random ones. It is suggested that the differences observed in current-voltage properties between the two systems are mainly due to the difference in the accumulation behavior of acceptor-like native defects at grain boundaries. A clear non-linearity is obtained by means of Co-doping even for the highly coherent Σ1 boundary in a ZnO bicrystal. This is considered to result from the production of acceptor-like native defects by Co-doping.
AB - SrTiO3 and ZnO bicrystals with various types of boundaries were fabricated in order to examine their current-voltage characteristics across single grain boundaries. Their grain boundary structures were also investigated by high-resolution transmission electron microscopy. In Nb-doped SrTiO 3, electron transport behaviors depend on the type of boundaries. Random type boundaries exhibit highly non-linear current-voltage characteristics, while low angle boundaries show a slight non-linearity. On the contrary, undoped ZnO does not exhibit non-linear current-voltage characteristics in any type of boundaries including random ones. It is suggested that the differences observed in current-voltage properties between the two systems are mainly due to the difference in the accumulation behavior of acceptor-like native defects at grain boundaries. A clear non-linearity is obtained by means of Co-doping even for the highly coherent Σ1 boundary in a ZnO bicrystal. This is considered to result from the production of acceptor-like native defects by Co-doping.
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U2 - 10.1016/j.stam.2003.10.031
DO - 10.1016/j.stam.2003.10.031
M3 - Article
AN - SCOPUS:1642352074
VL - 4
SP - 605
EP - 611
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
SN - 1468-6996
IS - 6
ER -