Temperature dependence of photoluminescence from self-organized Ge quantum dots with large size and low density |
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Authors: | LI Hui HE Tao DAI LongGui WANG XiaoLi WANG WenXin & CHEN Hong Institute of Physics Chinese Academy of Sciences Beijing China |
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Institution: | LI Hui,HE Tao,DAI LongGui,WANG XiaoLi,WANG WenXin & CHEN Hong Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China |
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Abstract: | Photoluminescence(PL) from self-organized Ge quantum dots(QDs) with large size and low density has been investigated over a temperature range from 10 to 300 K using continuous-wave(CW) optical excitation.The integrated PL intensity of QDs observed is negligible at about 10 K and rapidly increases with raising temperature up to 100 K.Through analyzing the PL experimental data of the QDs and wetting layer(WL),we provide direct evidence that there exists a potential barrier,arising from the greater compressive... |
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Keywords: | Ge quantum dots PL AFM thermal quenching activation energy |
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