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研究生： 黃姿瑋
Huang, Zi-Wei
論文名稱： 利用化學氣相沉積法成長無機鈣鈦礦CsPbBr3微米片的光性與雷射特性研究
Optical and Lasing Characteristics of Inorganic Cesium Lead Bromide Perovskites Micro-platelets Grown by Chemical Vapor Deposition
指導教授： 徐旭政
Hsu, Hsu-Cheng
學位類別： 碩士
Master
系所名稱： 理學院 - 光電科學與工程學系
Department of Photonics
論文出版年： 2018
畢業學年度： 106
語文別： 英文
論文頁數： 64
中文關鍵詞： CsPbBr3鈣鈦礦 、微米晶體 、化學氣相沉積 、雷射 、耳語迴廊模態
外文關鍵詞： CsPbBr3 perovskite, microcrystal, vapor deposition, lasing, whispering-gallery-mode cavity
相關次數： 點閱：186  下載：2 
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    • 近年來，鹵化鉛鈣鈦礦CH3NH3PbX3（X = I，Br，Cl）在太陽能電池、雷射等光電元件裡，表現出不錯的光學特性，而和有機和無機鹵化鉛鈣鈦礦相比，全無機的鈣鈦礦CsPbX3（X = I，Br，Cl）表現出更好的穩定性和相較之下較大的激子束縛能。在此研究中，我們使用化學氣象沉積法，來成長CsPbBr3的微米正方形晶體。由吸收光譜和變激發光功率的發光光譜可知，我們晶體的輻射放光主要是由激子放光所主導。而由顯微光致發光光譜成像(Photoluminescence Mapping)和螢光壽命成像圖(Fluorescence Lifetime Imaging)可知，單晶的CsPbBr3的微米正方形薄片有優異的發光特性。因為微晶有高結晶品質和高光學侷限性，因此我們可以有系統的研究其在室溫下激發雷射的量測。在光激發照射下，觀察到產生的雷射光是由晶體的四個角散逸而出，代表了光學微共振腔為耳語迴廊模態(whispering-gallery-mode, WGM)，與光場分佈的模擬結果一致。另外，我們也計算不同大小晶體的模態間距來證實微共振腔確實為WGM。

    Recently, lead halide based perovskites have received outstanding optical properties in photonic device, such as solar cell, laser etc. Compared with the organic-inorganic hybrid lead halide perovskites, all-inorganic lead halide, such as CsPbX3 (X = I, Br, Cl), exhibits better stability, and relatively larger exciton binding energy. In this work, we employed vapor-phase route to synthesize all-inorganic cesium lead bromide (CsPbBr3) square-shaped micro-platelets perovskite. Optical absorption measurement and power-dependent photoluminescence (PL) results identify the recombination is mainly responsible for excitonic transition. PL mapping and Fluorescence Lifetime Imaging (FLIM) results show the superior optical properties of single CsPbBr3 micro-platelet. Based on their high crystalline quality and high optical confinement, the room-temperature lasing actions with high-quality factor from single micro-platelet were investigated systematically. The PL lasing images of single CsPbBr3 micro-platelet reveal the lasing emission escaped from the four corners of the micro-platelet. These results indicate the optical resonant cavity belongs to the whispering-gallery-mode (WGM) cavity, which is in agreement with the FDTD simulation of the optical field distribution. Furthermore, the lasing mode spacing with different size of the micro-platelets analysis also confirms the laser cavity can be regarded as the WGM resonator.

    Contents 摘要 I Abstract II 致謝 III Contents IV List of Tables VI List of Figures VII Chapter 1. Introduction 1 1-1 Preface 1 1-2 Motivation 9 Chapter 2. Background Theories 10 2-1 Characteristics of Perovskite 10 2-1-1 Structural Properties 10 2-1-2 Optical Properties 13 2-1-2-1 Absorption and luminescence properties 13 2-1-2-2 Lasing behaviors 15 2-2 Photoluminescence 16 2-3 Resonant Cavity Mode Lasing 17 Chapter 3. Experiment Process and Measurement 21 3-1 Synthesis of Perovskite Microplatelet 21 3-2 Sample Analysis 23 3-2-1 Atomic Force Microscope (AFM) 23 3-2-2 X-ray Diffraction (XRD) 24 3-3 Measurement Instrument 25 3-3-1 Photoluminescence 25 3-3-2 Optical Absorption 27 3-3-3 Time-Resolved Photoluminescence 28 3-3-4 Sample Heating System 30 Chapter 4. Experiment Results and Discussions 31 4-1 Morphology and Structure Analysis 31 4-1-1 Optical Images 31 4-1-2 Atomic Force Microscope (AFM) 32 4-1-3 X-ray Diffraction (XRD) 34 4-2 Photoluminescence and Absorption 36 4-3 Time-Resolved Photoluminescence 40 4-4 Lasing Action 43 4-4-1 Optical Simulation by FDTD 44 4-4-2 Size-Dependent Threshold 45 4-4-3 Lasing Characteristic Temperature 55 Chapter 5. Conclusion and Future Work 60 5-1 Conclusion 60 5-2 Future Work 61 Reference 62

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