Electrical conductance measured from across or parallel to a {110} symmetrical grain boundary in SrTiO is considerably lower than the ones of the adjoined (100) grains and a SrTiO (100) single crystal, but these differences are decreased significantly upon UV irradiation. Based on ultraviolet photoelectron spectroscopy and complementary conductive atomic force microscopy, we demonstrate that the hundredfold increases in the electrical conductance measured at the grain boundary are strongly associated with the ultraviolet-induced oxygen vacancies. Our results reveal the possibility of tuning the oxygen vacancies and electrical conductance at the grain boundary simply by UV irradiation, offering novel strategies for optoelectronic applications.

中文翻译：

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紫外线照射如何增强 SrTiO3 晶界处的电导率

从横跨或平行于 SrTiO 中 {110} 对称晶界测量的电导率明显低于相邻 (100) 晶粒和 SrTiO (100) 单晶的电导率，但这些差异在紫外线照射后显着减小。基于紫外光电子能谱和互补导电原子力显微镜，我们证明在晶界处测量到的电导的百倍增加与紫外线诱导的氧空位密切相关。我们的结果揭示了仅通过紫外线照射即可调节晶界处的氧空位和电导的可能性，为光电应用提供了新颖的策略。