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Incorporation and localization of substitutional Mn~(2+) ions in cubic ZnS quantum dots

机译:取代Mn〜(2+)离子在立方ZnS量子点中的结合和定位

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Multifrequcncy electron paramagnetic resonance (EPR) and high resolution transmission electron microscopy (HRTHM) investigations were performed on small (2 nm) cubic ZnS nanocrystals (quantum dots-QDs) doped with 0.2% mol Mn~(2+), self-assembled into a mesoporous structure. The EPR data analysis shows that the substitutional Mn~(2+) ions are localized at Zn~(2+) sites subjected to a local axial lattice distortion, resulting in the observed zero-field-splitting parameter |D|=41 × 10~(-4) cm~(-1). The local distortion is attributed to the presence in the second shell of ligands of a stacking fault or twin, which alters the normal stacking sequence of the cubic structure. The HRTEM results confirm the presence of such extended planar defects in a large percentage of the investigated QDs. which makes possible the proposed substitutional Mn~(2+) impurity ions localization model. Based on these results it is suggested that the high doping levels of Mn~(2+) ions observed in cubic ZnS and possible in other II-VI semiconductor QDs prepared at low temperatures can be explained by the assistance of the extended lattice defects in the impurities incorporation.
机译:在掺有0.2%mol Mn〜(2+)的小(2 nm)立方纳米ZnS纳米晶体(量子点QDs)上进行了多频率电子顺磁共振(EPR)和高分辨率透射电子显微镜(HRTHM)研究,介孔结构。 EPR数据分析表明,取代的Mn〜(2+)离子位于受到局部轴向晶格畸变的Zn〜(2+)位置,从而导致观察到的零场分裂参数| D | = 41×10 〜(-4)厘米〜(-1)。局部变形是由于第二个壳层中存在堆积缺陷或孪晶配体,从而改变了立方结构的正常堆积顺序。 HRTEM结果证实了在大部分研究的QD中存在这种扩展的平面缺陷。这使得提出的取代Mn〜(2+)杂质离子定位模型成为可能。根据这些结果表明,在立方ZnS中观察到的Mn〜(2+)离子的高掺杂水平,以及在低温下制备的其他II-VI半导体量子点中可能出现的高掺杂水平,可以通过扩展晶格缺陷来解释。杂质掺入。

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