自聚型硒化鎘量子點耦合金屬奈米粒子之光學特性分析

Optical properties of self-organized CdSe quantum dots coupled to metal nanoparticles

林建佑(Chien-You Lin)

指導教授 ： 王智祥 ； 院繼祖

中原大學/理學院/物理研究所/碩士(2013年)

https://doi.org/10.6840/cycu201300773

摘要

本論文使用分子束磊晶法在硒化鋅緩衝層上成長自聚型硒化鎘量子點。利用原子力顯微鏡、光激螢光系統來研究硒化鋅緩衝層表面形貌與硒化鎘量子點光學特性，並使用微光激螢光系統探究引進奈米金粒子前後的光學特性。發現在基板溫度300 ℃下精準的控制二六族等效蒸氣壓比也無法在硒化鋅緩衝層形成原子級平坦的表面。硒化鎘量子點樣品變溫光激螢光的能量峰值隨溫度關係存在典型量子點的S型（S-shape）變化。硒化鎘量子點樣品變溫光激螢光的螢光強度隨溫度關係發現硒化鎘量子點和硒化鋅緩衝層介面處存在位能障。藉由微光激螢光光譜發現奈米金粒子的侷限表面電漿共振可以增強總螢光強度三倍。

關鍵字

分子束磊晶 ； 量子點 ； 硒化鎘 ； 表面電漿共振

並列摘要

Self-assembled CdSe quantum dots（QDs） have been grown on ZnSe buffer layer by using molecular beam epitaxy. Atomic force microscopy and photoluminescence were employed to study the surface morphology of ZnSe buffer layer and optical properties of CdSe QDs. Micro-photoluminescence was employed to investigate optical properties of self-organized CdSe quantum dots which coupled to Au nanoparticles. When we controlled II-VI beam equivalent pressure ratio at 300 ℃ substrate temperature, the surface of ZnSe buffer layer was still unable to be atomically-flat. The peak energy of temperature-dependent photoluminescence of self-organized CdSe quantum dots showed the typical S-shape. The luminescence intensity of temperature-dependent photoluminescence of self-organized CdSe quantum dots showed that potential barriers existed in the interface between CdS QDs and ZnSe buffer layer. Micro-photoluminescence spectra showed that localized surface plasmon resonance of Au nanoparticles could increase the total luminescence intensity three times.

並列關鍵字

molecular beam epitaxy ； quantum dots ； CdSe ； surface plasmon resonance

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