Preparation And Photoelectric Properties Of Molybdenum Disulfide/Lead Iodide Two-Dimensional Heterostructure

Since 2004,scientists have successfully stripped single-layer graphene from bulk high-oriented pyrolytic graphite,and many 2D materials have been discovered.While the extraordinary properties of graphene make it a unique platform for exploring low-dimensional physics and creating a new generation of electronic devices with unprecedented speed and flexibility,it has many unresolved shortcomings.The introduction of other two-dimensional materials has opened up more possibilities,including conductors and semiconductors with different band gaps.The van der Waals?vdWs?heterostructure formed by stacking different two-dimensional layered materials by weak van der Waals forces has aroused great interest among researchers.The rich two-dimensional material library makes the excellent properties of van der Waals heterostructures even better than the two-dimensional material itself.Molybdenum disulfide?MoS₂?and lead iodide?PbI₂?are two dimensional layered materials.The electrical properties and photoelectric properties of MoS₂/PbI₂ van der Waals heterostructures are studied.The main research contents are as follows:The first chapter introduces some research backgrounds and research significance.It mainly introduces the research status and background of van der Waals heterostructures,the properties and application of MoS₂ and PbI₂,as well as the research background and content of this topic.The second chapter introduces experimental instruments and methods.Introduction to the working principle and application of atomic force microscope,Kelvin force microscope and chemical vapor deposition.The third chapter introduces the preparation of MoS₂/PbI₂ van der Waals heterostructures by two-step method of vapor deposition and recrystallization.The surface potential was characterized by Kelvin probe force microscope.It was verified that charge transfer occurred at the interface of MoS₂/PbI₂ heterostructure,and the electrical properties of MoS₂/PbI₂ heterostructure were further understood.The fourth chapter explores the photoelectric performance of MoS₂/PbI₂heterostructures photodetector and compares it with the photoelectric performance of pure PbI₂ photodetector.The photoelectric properties have a certain degree of improvement of MoS₂/PbI₂ heterostructures,and the photoelectric properties of MoS₂/PbI₂ heterostructures have been further understood.Finally,the summary and outlook of the work,we summed up the full text and looked forward to the follow-up work.