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首页> 外文期刊>Physica status solidi, B. Basic research >Effects of valence band tails on the blue and red spectral shifts observed in the temperature-dependent photoluminescence of InN
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Effects of valence band tails on the blue and red spectral shifts observed in the temperature-dependent photoluminescence of InN

机译：价带尾部对InN依赖温度的光致发光中观察到的蓝色和红色光谱偏移的影响

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摘要

Lineshape-fitting, using a model that takes into account of band tails, was performed on the photoluminescence spectra measured from InN samples at temperatures varying from 5 to 300K. By analyzing how the fitted parameters varied with temperature, it was found that the previously observed blue and then red shift of emission peak position with increasing temperature is related to valence band tails. The initial blue-shift at low temperature is due to filling of valence band tails while the subsequent Varshni red-shift is due to lattice expansion. In a series of samples grown using increasing trimethylindium flow rates during metal organic chemical vapor deposition, the impurity potential that describes the width of the valence band tail increased from 18 to 26meV, possibly due to more nitrogen vacancies being created in the material.
机译：使用考虑带尾的模型，对从InN样品在5至300K的温度下测量的光致发光光谱进行了线形拟合。通过分析拟合参数如何随温度变化，发现先前观察到的发射峰位置随温度升高而出现的蓝移和红移与价带尾部有关。低温下的初始蓝移归因于价带尾部的填充，而随后的Varshni红移归因于晶格扩展。在金属有机化学气相沉积过程中使用增加的三甲基铟流速生长的一系列样品中，描述价带尾部宽度的杂质电势从18meV增加到26meV，这可能是由于材料中产生了更多的氮空位所致。

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