近年來，鹵化物鈣鈦礦作為光電子器件材料引起了極大的關注。無機鈣鈦礦通常具有高量子效率，長光載流子壽命和快速電荷轉移特性。通過簡便的熱注入法合成了光致發光光譜位於640 nm的CsPbBr1.2I1.8量子點。吸收光譜顯示CsPbBr1.2I1.8量子點能隙約為1.93 eV。在本研究中，製造了基於銀奈米粒子與CsPbBr1.2I1.8量子點異質結構的光電探測器。所製備的光電檢測器具有優異的性能，響應時間快和檢測率高。銀奈米粒子與入射光相互作用，銀奈米粒子的電子將隨入射光的電場振盪，產生局部表面電漿共振。銀納米粒子的局部表面電漿共振可以將光探測器的光響應提高約1.6倍。

In recent years, halide perovskites have attracted enormous attention as promising materials for optoelectronic devices. Inorganic perovskites often have high quantum efficiency, long photocarrier lifetime and fast charge transfer. CsPbBr1.2I1.8 quantum dots with photoluminescence spectrum located at 640 nm were synthesized by a facile hot-injection method. The UV-vis absorption spectrum exhibits that the bandgap absorption is around 1.93 eV. In the present research, a photodetector based on Ag NPs/ CsPbBr1.2I1.8 QDs heterojunction was fabricated. The as-prepared photodetector had excellent performance with fast response time and high detectivity. According to the localized surface plasmon resonance (LSPR), the electrons of Ag nanoparticles will oscillate with the electric field of incident light. The LSPR of Ag nanoparticles was found to enhance the photoresponse of the photodetector by about 1.6 times.

謝誌...i
Abstract...ii
摘要...iv
目錄...v
Chapter 1 Introduction...1
1.1Motivation...1
1.2Photodetector...2
1.2.1Photoconductive Effect...3
1.2.2 Photoconductor...4
1.2.3 Photodiode...4
1.3 Nanotechnology...5
1.3.1 Nanostructures...8
1.3.2 Zero-Dimensional Nanostructures...8
1.3.3 Chemical Solution Growth Mechanism of 0D Nanomaterials...9
1.3.4 Chemical Solution Growth Method...9
1.4 Inorganic Perovskite...11
1.4.1 Structure of CsPbI3...11
1.4.2 Properties of CsPbI3...12
1.5 Metal-Semiconductor Contact (MS contact)...13
1.5.1 Ohmic Contact...14
1.5.2 Schottky Contact...15
1.5.3 Metal-Semiconductor-Metal Contact Photodetector...16
1.6 Plasmonic Properties of Nanomaterials...17
1.6.1 Localized Surface Plasmon Resonance (LSPR) and Applications...17
1.6.2 Surface Plasmon Polarition (SPP) and Applications...19
1.6.3 Plasmonic Materials...20
1.7 Mechanisms of Photoresponse Plasmon Enhancement...21
Chapter 2 Experimental Procedures......24
2.1 Experimental Procedures...24
2.1.1 Synthesis Procedures of CsPbBr1.2I1.8 Quantum Dots...24
2.1.2 Synthesis Procedures of Ag Nanopartices...25
2.1.3 Fabrication of Ag NPs/CsPbBr1.2I1.8 Quantum Dots Photodetector...26
2.2 Experimental Systems and Equipments...28
2.2.1 Scanning Electron Microscope (SEM)...28
2.2.2 Field Emission – Electron Probe Micro-analyzer (FE-EPMA)...29
2.2.3 X-ray Diffraction (XRD) Analysis...30
2.2.4 Transmission Electron Microscope (TEM)...31
2.2.5 UV-Vis Spectroscopy...32
2.2.6 Photoluminescence (PL)...32
2.2.7 Atomic Force Microscope (AFM)...33
2.2.8 Electron Beam Deposition System...34
Chapter 3 Results and Discussion...35
3.1 Properties and Characteristics of CsPbBr1.2I1.8 Quantum Dots...35
3.1.1 XRD Analysis...35
3.1.2 TEM Observation...35
3.1.3 UV-Vis Absorbance Spectrum and PL Spectrum...36
3.1.4 SEM and WDS Observation of CsPbBr1.2I1.8 Quantum Dots Film...37
3.1.5 AFM Observation of CsPbBr1.2I1.8 Quantum Dots Film...38
3.2 Properties and Characteristics of Ag Nanoparticles...39
3.2.1 XRD Analysis...39
3.2.2 TEM Observation...40
3.2.3 UV-Vis Absorbance Spectrum...41
3.3 Properties and Characteristics of Ag Nanoparticles / CsPbBr1.2I1.8 Quantum Dots...42
3.3.1 Photoluminescence Measurements...42
3.3.2 UV-Vis Absorbance Measurements...43
3.3.3 AFM Analysis of Different Concentration Ag nanoparticles...44
3.4 CsPbBr1.2I1.8 Quantum Dots Photodetector...45
3.4.1 Current versus Voltage (I-V) Curves Characteristics...45
3.4.2 Photoswitching Characteristic...46
3.5 Ag nanoparticles / CsPbBr1.2I1.8 Quantum Dots Photodetector...47
3.5.1 Current versus Voltage (I-V) Curves Characteristics...48
3.5.2 Photoswitching Characteristic...49
Chapter 4 Summary and Conclusions...54
Chapter 5 Future Prospects...55
References...57

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