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首页> 外文期刊>Physica, B. Condensed Matter >Evolution of symmetry forbidden and silent Raman modes of cadmium doped zinc oxide films activated by swift heavy ion irradiation
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Evolution of symmetry forbidden and silent Raman modes of cadmium doped zinc oxide films activated by swift heavy ion irradiation

机译：SWIFT重离子辐射激活对称禁区缺陷和沉默拉曼模式的对称性和无声拉曼模式

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摘要

Origin of evolution of Raman modes from cadmium doped zinc oxide thin films is reported under swift heavy ion irradiation by performing the systematic micro-Raman investigations at various ion fluences and energy deposited into the lattices. Films were also well characterized for their structural and morphological properties. It is reported that Raman spectra of silver irradiated films show that the E-2(high) peak intensity reduces with peak broadening upon increase in ion fluences, but not completely disappeared like in case of undoped zinc oxide films. Evolution of intense A(1)(LO) peak was also observed along with significant softening and understood by phonon localization due to high density of defects induced by irradiation. On the other hand irradiation by oxygen ions induces relatively strong A(1)(TO) and B-1(low) modes including the non-appearance of A(1)(LO) mode, which were supposed to be symmetry forbidden in back-scattering and silent modes, respectively. Thus, present study provides better experimental insights about the Raman modes for their possible implications in optoelectronic devices.
机译：通过在各种离子流量和沉积在格子中的各种离子流量和能量下进行系统的微拉曼调查，报告来自镉掺杂氧化锌薄膜的拉曼模式的血管型氧化锌薄膜的起源。薄膜的特征在于它们的结构和形态学性质。据报道，银辐射薄膜的拉曼光谱表明，E-2（高）峰强度随着离子流量的增加而降低峰值，但在未掺杂的氧化锌膜的情况下，并不像在外部氧化锌膜一样完全消失。还观察到强烈A（1）（1）（1）（1）（LO）峰值的演变，并且由于通过照射引起的高密度，声子定位而被显着软化和理解。另一方面，氧离子的照射诱导相对强的A（1）（至）和B-1（低）模式，包括（1）（lo）模式的非外观，这应该是背部禁止的对称性 - 分别散射和静音模式。因此，目前的研究提供了关于拉曼模式的更好的实验识，以便在光电器件中可能影响。

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