第二類型硒化鎘/銻化鋅核殼結構量子點之光學性質及鬆弛機制研究

Optical Properties and Relaxation Dynamics of Type-II CdSe/ZnTe Core/Shell Quantum Dots

黃聖智(Sheng-Chih Huang)

指導教授 ： 陳永芳

國立臺灣大學/理學院/物理研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00281

摘要

無資料

關鍵字

光學性 ； 鬆弛 ； 第二類型 ； 硒化鎘/銻化鋅 ； 核殼結構 ； 量子點

並列摘要

We perform measurements of the photoluminescence (PL) and the time-resolved PL on type-II CdSe/ZnTe core/shell quantum dots (QDs). First of all, we compare the dependence of PL and time-resolved PL on temperature and find that exciton would redistribute into larger dots at low temperature, with the recombination dominated by the radiative part. As increasing the temperature, the nonradiative part becomes dominant and the main mechanism arises from the ionization of exciton and the interaction between exciton and LO-phonon. Additionally, we observe that the radiative recombination time varies linearly with the linewidth of PL.
In the measurement of excitation power dependent time-resolved PL, it is found that the radiative recombination time decreases with increasing power and may be attributed to the band bending effect due to the spatially photoexcited carriers in a type-II band alignment. In the last section, detected photon energy dependent time-resolved PL reveals that the radiative recombination time is proportional to cube of the size of QDs and this relationship may arise from the quantum confinement effect.

並列關鍵字

optical ； relaxation ； CdSe/ZnTe ； core/shell ； quantum dot

參考文獻

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