The Synthesis And Electro-optical Properties Of Cu₂ZnSnS₄ Nanocrystals And Mn Doped CH₃NH₃PbBr₃ Nanowires

Photoelectric materials is an important building blocks for new information and nextgeneration energy technologies. The basic properities and applications of traditional semiconductor materials already have been investigated comprehensively and thoroughly. Developing new multiple materials and exploiting their application are urgent prerequisite for promoting relevant technological progress. In addition, nanophotonics has rapidly developed in recent years, which integrates nanotechnology with photonics. It has created new challenges and opportunities in physics, chemistry, engineering, biology, medicine, and so on. What’s more, nanophotonics provides a new perspective to insight the interaction between light and matters, which introduce more new physical properties and applications. The details of this thesis are as follows:（1） Impure-free kesterite Cu₂ZnSnS₄ nanocrystals with a band gap of 1.52 eV have been successfully synthesized via a facile solvothermal strategy. A doping growth and formation mechanism of Cu₂ZnSnS₄ nanocrystals in the solvothermal reaction was proposed. Then, the impact of sulfur source concentration and species of Sn precursor on the final produced was investigated. A solar cell was fabricated with the Cu₂ZnSnS₄ nanocrystals, which demonstrated its potential applications as photovoltaic absorber materials. Finally, solid-state ligand exchange was used to improve the performance of the solar cell by treating the Cu₂ZnSnS₄ layer with the organic ligand 1, 2-ethanedithiol dissolved in methanol.（2） High quality CH₃NH₃PbBr₃ nanowires and Mn doped CH₃NH₃PbBr₃ nanowires were prepared by a surface-initiated solution growth strategy. The effect of temperature and magnetic ions on the optical properties of the nanowires was studied by the photoluminescence spectrum. Finally, we investigated the stimulated emission and magnetic properties of the Mn doped CH₃NH₃PbBr₃ nanowires.