臺灣博碩士論文加值系統

本論文研究探討氧化鋅奈米線與氧化鋅/硫化鋅殼層奈米結構之發光特性。實驗使用二乙基鋅及氧化亞氮生長氧化鋅奈米線於氧化鋁基板上，而氧化鋅/硫化鋅殼層奈米結構則是利用二丁基硫和二乙基鋅當作前驅物將硫化鋅殼層長在氧化鋅奈米線上面。氧化鋅奈米線與氧化鋅/硫化鋅殼層奈米結構之發光特性採用光激發光頻譜量測來分析與鑑定。從研究結果得知，我們可以從常溫PL中發現當氧化鋅奈米線塗佈上硫化鋅之後造成紅移0.015eV的現象。從低溫光激發光頻譜量測可偵測到氧化鋅奈米線與氧化鋅/硫化鋅殼層奈米結構皆有中性受體激子、中性施體激子以及受體-施體對躍遷之光訊號。而氧化鋅/硫化鋅殼層奈米結構中表面激子的消失代表著殼層奈米結構有著將電子與電洞區隔開來的功效。

In this thesis, we investigate on the optical characteristics of zinc oxide (ZnO) nanowires and ZnO/ZnS core-shell nanostructures. In the experiment, ZnO nanowires were grown on the sapphire using diethylzinc (DEZn) and nitrous oxide (N2O) as precursors, and the ZnS shells of ZnO/ZnS core-shell nanostructures were grown on the ZnO nanowires using the ditert-butylsulfide (DTBS) and DEZn as precursors. The luminescence properties of ZnO nanowires and ZnO/ZnS core-shell nanostructures were studied by photoluminescence (PL) spectroscopy. RT PL measurements of ZnO/ZnS core-shell nanostructures shows a 0.015eV red shifts in neutral donor exciton emission of ZnO after coating ZnS. Low temperature PL measurements of ZnO nanowires and ZnO/ZnS core-shell nanostructures also show the neutral accepter exciton emission and the donor accepter pair emission in addition to the neutral donor exciton emission. The disappearance of the surface exciton PL emission in ZnO/ZnS core-shell nanostructure samples is attributed to the separation of the electrons and holes in the core-shell nanostructures.

Table of contents

Acknowledgement (in Chinese) ...................................................................................i

Abstract (in Chinese) .................................................................................ii

Abstract ....................................................................................................iii

Table of contents ......................................................................................iv

List of figures ...........................................................................................vi

Chapter 1 Introduction ...............................................................................1

Chapter 2 Background and motivation of this study..................................2

2.1 Reviews of core-shell nanostructures............................................2

2.2 Polariton and phonon replicas…………………………………...4

2.3 Motivation of this study………………………………………….9

Chapter 3 Experimental procedures ........................................................10

3.1 Prepared substrates for samples in our study…………………..10

3.2 Growth of ZnO nanowires and ZnO/ZnS core-shell nanostructures………………………………………………….11

3.3 Photoluminescence spectroscopy………………………………14

Chapter 4 Results and discussion ............................................................16

4.1 Room temperature photoluminescence spectroscopy…………..16

4.2 Low temperature photoluminescence spectroscopy……………21

4.3 Temperature-dependent photoluminescence spectroscopy…….28

Chapter 5 Conclusions and future works…………..................................33

References................................................................................................34

List of figures

Figure 2-1.A schematic showing the Type-I and type-II energy band diagram ……………………………………………………….3
Figure 2-2 (a)A schematic showing the dispersion curve of a exciton and photon without interaction and (b) a schematic of the excito-polariton dispersion curves.....……………................6
Figure 2-3. A schematic drawing of the free exciton-mLO phonon emission process ….……………………………….………..7
Figure 2-4. A schematic showing the the lattice distortion of polarons in a compound semiconductor having positive and negative ions....8
Figure 3-1. The temperature versus time plot of growth condition for ZnO nanowires. ……………………………………………...….12
Figure 3-2. The temperature versus time plot of growth condition for ZnO/ZnS core-shell nanostructures.………….………………………………….13
Figure 3-3. A schematic showing the setup of the PL measurement system. …………………………………………………….15
Figure 4-1. A plot of the PL spectrum of the ZnO nanowires at 300K. The inset shows the detailed signal data detected near 2.33eV...18
Figure 4-2.A PL plot of the ZnO nanowires at 300K. ………………….19
Figure 4-3. PL plots of the ZnO nanowires and ZnO/ZnS core-shell nanostructures at 300K. ………..………………………….20
Figure 4-4. A 10K PL plot of ZnO nanowires. The inset shows the detailed defect emission detected near 2.8eV. …………….23
Figure 4-5. A 10K PL plot of ZnO nanowires. The inset shows the curve-fitting of the excitonic emission and phonon replica….24

Figure 4-6. A schematic depicts the effect of surface negative charges on the energy band diagram of a ZnO nanowires……………..25
Figure 4-7. A 10K PL plot of ZnO/ZnS core-shell nanostructures. The inset shows the curve-fitting of the excitonic emissions and phonon replica……………………………………………..26
Figure 4-8. A schematic depicts the effect of ZnS coating on the energy band diagram of a ZnO/ZnS core-shell nanostructures………27
Figure 4-9. Temperature-dependent PL plots of the ZnO nanowires. The inset shows detailed near band edge emission. ………...…….29
Figure 4-10. Plot of the PL emission energy versus temperature for ZnO nanowires. …………………………………………………30
Figure 4-11. Temperature-dependent PL plots of the ZnO/ZnS core-shell nanostructures. The inset shows detail near band edge emissions. …………………………………………………31
Figure 4-12. A plot of the PL emission energy versus temperature for ZnO/ZnS core-shell nanostructures. ………………………32

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