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Lattice variation and Raman spectroscopy in hierarchical heterostructures of zinc antimonate nanoislands on ZnO nanobelts

机译：ZnO纳米带上锑酸锌纳米岛的分层异质结构的晶格变异和拉曼光谱

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In ZnO hierarchical heterostructures of zinc antimonate nanoislands on ZnO nanobelts, the substitution of Sb5+ for Zn2+ induces lattice contraction and a variation in vacancy defects, and moreover the preferential accumulation and segregation of Sb in {001} planes results in the intense perturbation of atomic motion in the a-b plane. Under nonresonant conditions, nonpolar E-2(high) and polar quasi-longitudinal optic (LO) modes decrease in frequency due to finite-size and phonon confinement effects. Under resonant conditions, localized excitons can ionize to free carriers and form plasmons at higher excitation power density, resulting in the transformation of scattering coupling from localized exciton-LO-phonon to LO-phonon-plasmon. The intensity ratio of 2LO/1LO decreases and multiphonon scattering shows a decrease in frequency with unequal neighboring interval, and moreover the scattering coupling between the continuum of electron-hole plasmon and the discrete LO phonons causes an asymmetric lineshape.
机译：在ZnO纳米带上锑酸锌纳米岛的ZnO分层异质结构中，用Sb5 +代替Zn2 +会引起晶格收缩和空位缺陷的变化，而且Sb在{001}平面中的优先积累和偏析会导致原子运动的强烈扰动。在腹肌平面中。在非谐振条件下，由于有限尺寸和声子限制效应，非极性E-2（高）和极性准纵向光学（LO）模的频率降低。在共振条件下，局部激子可以电离成自由载流子，并在更高的激发功率密度下形成等离激元，从而导致散射耦合从局域激子-LO-声子转变为LO-声子-等离子体。 2LO / 1LO的强度比降低，多声子散射的频率降低，相邻间隔不相等，而且电子-空穴等离子体激元的连续谱与离散的LO声子之间的散射耦合导致线形不对称。

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