Non-linear current-voltage characteristics related to native defects in SrTiO3 and ZnO bicrystals

Yukio Sato, Tomohito Tanaka, Fumiyasu Oba, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

研究成果: Article査読

12 被引用数 (Scopus)


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.

ジャーナルScience and Technology of Advanced Materials
出版ステータスPublished - 2003 11月

ASJC Scopus subject areas

  • 材料科学(全般)


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