Homogeneity and variation of donor doping in Verneuil-grown SrTiO3:Nb single crystals.
Homogeneity and variation of donor doping in Verneuil-grown SrTiO3:Nb single crystals.
复制标题
Verneuil 生长的 SrTiO3:Nb 单晶中施主掺杂的均匀性和变化。
DOI:
10.1038/srep32250
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发表时间:
2016-08-31
影响因子:
4.6
通讯作者:
Waser R
中科院分区:
文献类型:
--
作者:
Rodenbücher C;Luysberg M;Schwedt A;Havel V;Gunkel F;Mayer J;Waser R
The homogeneity of Verneuil-grown SrTiO3:Nb crystals was investigated. Due to the fast crystal growth process, inhomogeneities in the donor dopant distribution and variation in the dislocation density are expected to occur. In fact, for some crystals optical studies show variations in the density of Ti3+ states on the microscale and a cluster-like surface conductivity was reported in tip-induced resistive switching studies. However, our investigations by TEM, EDX mapping, and 3D atom probe reveal that the Nb donors are distributed in a statistically random manner, indicating that there is clearly no inhomogeneity on the macro-, micro-, and nanoscale in high quality Verneuil-grown crystals. In consequence, the electronic transport in the bulk of donor-doped crystals is homogeneous and it is not significantly channelled by extended defects such as dislocations which justifies using this material, for example, as electronically conducting substrate for epitaxial oxide film growth.
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