Contents Introduction 1 Ferroelectric Materials 1 Basic Concept of Ferroelectric Materials 1 Physical Properties of Ferroelectric Materials 3 PMN-PT Relaxor Ferroelectric Single Crystals 4 PMN-PT Complex Perovskite Structure 4 Research Progress of PMN-PT Single Crystals 6 The Applications of PMN-PT Single Crystals 9 The Main Research Contents of This Thesis 21 References 24 An Optothermal Field Effect Transistor Based on PMN-26PT Single Crystal 29 Introduction of This Chapter 29 Field Effect Transistors and the 'Photonics Revolution' . . . 29 Interface Engineering of Two-Dimensional Channel Semiconductor 30 The Design and Fabrication of Optothermal FET 31 Structural Design of the Prototype FET 31 Processing of PMN-26PT Single Crystal 34 Growth and Transfer of Monolayer MoS2 38 The Device Performance and Working Mechanism of Optothermal FET 41 Infrared Response 41 Mechanism Analysis of Optothermal Regulation 43 Summary of This Chapter 46 References 47 XVI Contents An Ultrabroadband Photodetector Based on PMN-28PT Single Crystal 49 Introduction of This Chapter 49 Broadband Photodetector 49 Response Characteristics of Pyroelectric Detectors 51 Structural Design and Preparation of Ultrabroadband Detector . . . 51 Structural Design of Photodetectors 51 Processing and Characterization of PMN-PT Single Crystal 52 Domain Engineering of PMN-PT Single Crystal 55 Preparation of Silver Nanowires Transparent Electrode . . . 58 The Performance and Mechanism Analysis of the Photodetector 60 Optimization of Pyroelectric Frequency Response 63 Broadband Response in the Ultraviolet-Terahertz Range 66 The In?uence of Surface Plasmons on Pyroelectricity 67 Discussion on the Mechanism of Ferroelectric Photovoltaic in the Ultraviolet Band 68 Summary of This Chapter 71 References 71 A Mechanical Energy Writeable Ferroelectric Memory Based on PMN-35PT Single Crystal 75 Introduction of This Chapter 75 Ferroelectric Non-volatile Memory and Its Energy Consumption 75 Self-powered System and Nanogenerator 76 Arch-Shaped TENG 77 Design and Preparation of TENG 77 Energy Conversion Mechanism of TENG 80 Electrical Output Performance of TENG 82 Self-powered Ferroelectric Memory System 85 Properties of PMN-PT Single Crystal 86 Exploration of New Poling Methods 89 Ferroelectric FET Memory 92 Self-powered Ferroelectric Memory System 93 Storage Density and Microscopic Ferroelectric Domain . . . 96 4.4 Summary of This Chapter 99 References 99 Conclusion and Outlook 103 Research Conclusions 103 Prospects 104