Grain boundary dependency of nonlinear current–voltage characteristics in Pr and Co Doped ZnO Bicrystals
Grain boundary dependency of nonlinear current–voltage characteristics in Pr and Co Doped ZnO Bicrystals
复制标题
DOI：
10.1063/1.1636816
复制
发表时间：
2004-01
影响因子：
3.2
通讯作者：
Y. Sato;F. Oba;M. Yodogawa;Takahisa Yamamoto;Y. Ikuhara
中科院分区：
文献类型：
--
作者：
Y. Sato;F. Oba;M. Yodogawa;Takahisa Yamamoto;Y. Ikuhara
制备了不同晶界类型的Pr和Co掺杂ZnO双晶，研究了它们的伏安特性。此外，他们的晶界结构和化学成分进行了研究，使用高分辨率透射电子显微镜和能量色散X射线光谱。结果发现，所有的边界原子连接，但有一些沉淀的Pr6O11。Co掺杂剂分布在晶粒内部和边界上，而Pr掺杂剂在制造的晶界处偏析，除了高度相干的晶界。无Pr偏聚的晶界表现出近似欧姆特性，而Pr偏聚明显的重合点阵和随机晶界则表现出非线性特性。非线性的变化归因于与晶界结构相关的Pr浓度的差异。
Pr and Co doped ZnO bicrystals with various types of grain boundaries were fabricated to investigate their current–voltage characteristics. In addition, their grain boundary structures and chemical compositions were investigated using high-resolution transmission electron microscopy and energy-dispersive x-ray spectroscopy. It was found that all the boundaries are atomically joined, but have some precipitates of Pr6O11. Co dopants are distributed over the grain interiors and boundaries, while Pr dopants segregate at the fabricated grain boundaries except for a highly coherent Σ1 boundary. The Σ1 boundary with no Pr segregation shows an almost Ohmic characteristic, and coincidence-site lattice and random boundaries with clear Pr segregations show nonlinear characteristics. The change in the nonlinearity is attributed to the difference of the Pr concentration that is associated with the grain boundary structure.