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首页> 外文期刊>Journal of Crystal Growth >1.75μm emission from self-organized InAs quantum dots on GaAs
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1.75μm emission from self-organized InAs quantum dots on GaAs

机译:GaAs上自组织InAs量子点的1.75μm发射

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摘要

Photoluminescence (PL) of self-organized InAs quantum dots (QDs) grown by conventional solid source molecualr beam epitaxy (MBE) on a GaAs substrate was studied as functionof the deposition temperature. We have found that decreasing the growth temeprature below the 480-500 deg C range leads to the appearance and increase in intensity of a long wavelength band in addition to the usual 1μm line in a low-temeprautre PL spectrum. At the deposition temperature of 300 deg C this line domiantes in the room temeprature (RT) PL spectrumand its peak position is 1.75μm. TEM studies have shown that the origin of this line are agglomerates of QDs which are formed in two preferential chain- and clsuter-like shapes.
机译:研究了传统的固体源分子束外延(MBE)在GaAs衬底上生长的自组织InAs量子点(QD)的光致发光(PL)与沉积温度的关系。我们已经发现,将生长温度降低到480-500摄氏度以下会导致长波长带的出现并增加强度,除了在低温度聚醚砜光谱中通常使用的1μm谱线之外。在300℃的沉积温度下,该线在室温(RT)PL光谱中占主导地位,其峰值位置为1.75μm。 TEM研究表明,这条线的起源是QD的聚集体,它们以两种优先的链状和丛状形状形成。

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