声明
摘要
ABSTRACT
Table of Content
Chapter 1 Introduction
1.1.1 Nanowires (NWs)
1.1.2 Different structure NWs
1.1.3 Core shell nanowires(CSNWs)
1.1.4 Theoretical perspective
1.2 Applications
1.2.1 Electronic and electrical applications
1.2.2 Optical applications
1.2.3 Photovoltaic applications
1.2.4 Sensors
1.3 2D Monolayers and Heterostrueture
1.3.1 Transition metal dichalcogenides(TMD)
1.3.2 Optical and electronic properties of 2D materials
1.3.3 Heterostructures of 2D materials
1.4 Applications of Atomically Thin TMD Materials
1.5 Thesis Outline
Chapter 2 Theoretical Model
2.1.4 Density functional theory (DFT)
2.2 Background of DFT
2.3 Mathematics of DFT
2.4 Theorems of DFT
2.5 Two Fundamental Theorems
2.5.2 Kohn-Sham theorems
2.6 Kohn-Sham Orbitals
2.7 Electron Probability Density
2.8 Kohn-Sham Energy
2.9 Exchange Correlation Potential
2.10 Density Functional Calculation Procedure
2.11 Exchange-correlation functional
2.11.1 Local density approximation(LDA)
2.11.2 Local spin density approximations(LSDA)
2.11.3 Generalized gradient approximation(GGA)
2.11.4 Hybrid functionals
Chapter 3 Band Gap Modulation in ZnS/Si and Si/ZnS Core/Shell NWs
3.1 Introduction
3.2 Methodology
3.3 Results and Discussion
3.3.1 Structural parameters
3.3.2 Electronic properties
3.3.3 Cohesive energy
3.4 Conclusion
Chapter 4 Structural and Electronic Properties of CdSe/ZnS and ZnS/CdSe Core/Shell Nws
4.1 Introduction
4.2 Methodology
4.3 Results and Discussion
4.3.1 Structural properties
4.3.2 Electronic properties
4.3.3 Projected density of states(PDOS)analysis
4.4 Conclusion
Chapter 5 Enhanced Electronic and Optical Properties of Three TMD Heterobilayers
5.1 Introduction
5.2 Methodology
5.3 Results and Discussion
5.3.1 ZrS2/HfS2 heterobilayer
5.3.2 ZrSe2/HfSe2 heterobilayer
5.3.3 SnS2/SnSe2 heterobilayer
5.4 Conclusion
ZrS2/graphene Heterobilayer for Rechargeable Li Ion Batteries
6.1 Introduction
6.2 Methodology
6.3 Results and Discussion
6.3.1 ZrS2 monolayer
6.3.2 Li on ZrS2 monolayer
6.3.3 Li insertion into ZrS2/graphene heterostructure
6.3.4 Electronic structure of ZrS2 monolayer and ZrS2/graphene heterostructure
6.4 Conelusion
Chapter 7 Summary of Dissertation
References
Acknowledgement
Publications