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首页> 外文期刊>Materials Science and Engineering >Short communication Probing electronic defect states in manganite/SrTiO_3 heterostructures by surface photovoltage spectroscopy
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Short communication Probing electronic defect states in manganite/SrTiO_3 heterostructures by surface photovoltage spectroscopy

机译:短距离通信通过表面光电压光谱探测锰/ SrTiO_3异质结构中的电子缺陷状态

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The energetic distribution of electronic defect states in oxide heterostructures made of ultrathin lanthanum manganite (La_(0.7)Ca_(0.3)Mn_(0.3), La_(0.7)Ce_(0.3)MnO_3) films on SrTiO_3 substrates is investigated by surface photovoltage (SPV) spectroscopy. Within a comparative evaluation of the SPV spectra of both the film/substrate structures and pure substrates at different temperatures we were able to elaborate a map of defect states across the SrTiO_3-bandgap and we find that the defect state distribution is mainly affected by the substrate, i.e., no specific film-induced defect states were detected. Possible origins of the defect states are discussed within the framework of a semiconductor band scheme, taking into account complementary photoconductivity and SPV transient data.
机译:利用表面光电压(SPV)研究了超薄锰酸镧(La_(0.7)Ca_(0.3)Mn_(0.3),La_(0.7)Ce_(0.3)MnO_3)薄膜在SrTiO_3衬底上形成的氧化物异质结构中电子缺陷态的能级分布。 )光谱学。在对薄膜/衬底结构和纯衬底在不同温度下的SPV光谱进行比较评估的过程中,我们能够绘制出SrTiO_3带隙上的缺陷状态图,并且发现缺陷状态分布主要受衬底影响即,未检测到特定的膜诱发缺陷状态。考虑到互补的光电导性和SPV瞬态数据,在半导体波段方案的框架内讨论了缺陷状态的可能起源。

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