低維硒化鎘納米材料物理性能預(yù)測
[Abstract]:Since its discovery, graphene has attracted more and more attention due to its unique geometric structure and excellent physical properties. The band gap of graphene with intrinsic structure is zero. Scientists applied strain to open the band gap by physical method, or doped other atoms by chemical method to obtain graphene with band gap. By changing the dimension of graphene, two dimensional graphene is cut into one dimensional graphite band to adjust its electronic structure, magnetic and optical properties. Due to the uniqueness of two-dimensional nanostructures and the problem of zero-band gap of graphene, it is a very hot research topic to find and study two-dimensional structures with non-zero band gap similar to graphene. Through the continuous efforts of scientists in recent years, graphene-like two-dimensional and one-dimensional systems have been found. As an important direct transition and wide band gap semiconductor material in the II-VI family, CdSe has unique physical and chemical properties and has been successfully used in optical amplifiers. Solar cells, photovoltaic devices, bioluminescence labeling, etc. In the past few decades, the two-dimensional structure of cadmium selenide nanocrystalline has been experimentally prepared by sol method for the thickness of 1.4nm. Although a certain thickness of CD se nanocrystals has been prepared by experiments, the optical and magnetic properties of the monolayer and one-dimensional CD se nanocrystals / nanobelts have not been studied. The main contents of this thesis are as follows: 1. Based on the first principle of density functional theory, the effect of two-dimensional cadmium selenide nanoparticles on electronic structure under uniform strain is studied. The results show that the band gap of cadmium selenide nanoparticles decreases with the increase of strain. At the same time, the effect of uniform strain on the refraction coefficient and extinction coefficient in the real, imaginary and optical constants of dielectric constant is discussed. It is found that the peak value of the imaginary part of the dielectric constant is redshift when the stress increases, and the red shift also occurs in the extinction coefficient. In addition, the reflection coefficient, absorption coefficient and energy loss coefficient of cadmium selenide nanocrystals were studied. Based on the first principle of density functional theory, the electronic structure and magnetic properties of sawtooth and armrest cadmium selenide nanoribbons at different widths and under the condition of hydrogen atom passivation and non-passivation are studied. It is found that the band gap of the armrest type cadmium selenide nanoribbons decreases monotonously with the increase of the width, and appears to be a direct band gap semiconductor. However, the zigzag cadmium selenide nanoribbons exhibit magnetic properties and metal properties. The magnetic properties of the zigzag CDs nanoribbons change to zero. 3 under hydrogen passivation. Based on the first principle of density functional theory, the effects of axial strain on the structure, electrical and magnetic properties of cadmium selenide nanoribbons are studied, and the stability of armrest and sawtooth type is investigated. It is found that the strain has a strong effect on the geometrical structure, electronic structure and magnetic properties of cadmium selenide nanoribbons. Through the analysis of binding energy, it is found that the armrest cadmium selenide nanobelts are more stable than the serrated cadmium selenide nanoliths.
【學(xué)位授予單位】:上海師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TB383.1
【共引文獻(xiàn)】
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