First principles study on electronic structure and optical properties of novel Na-hP4 high pressure phase

The electronic structure and optical properties of novel Na-hP4 high pressure phase at different pressures(260,320,400 and 600 GPa)were investigated by the density functional theory(DFT)with the generalized gradient approximation(GGA)for the exchange and correlation energy.The band structure along the higher symmetry axes in the Brillouin zone,the density of states(DOS) and the partial density of states(PDOS)were presented.The band gap increases and the energy band expands to some extent with the pressure increasing.The dielectric function,reflectivity,energy-loss function,optical absorption coefficient,optical conductivity, refractive index and extinction coefficient were calculated for discussing the optical properties of Na-hP4 high pressure phase at different pressures.

基于飞秒激光烧蚀技术的银网格透明电极制备研究

透明电极主要应用于热敏感性功能器件、触摸屏面板、电热传导设备、有机发光二极管和太阳能电池等,高透射率、高导电性和高机械特性是柔性透明电极的关键性能。本文采用飞秒激光直写银薄膜制备出了高机械性能和低成本的银网格柔性透明电极。所制备的银网格柔性透明电极可见光透射率大于92.1%、方块电阻小于15.4sq/Ω,可以与商业的ITO电极材料相媲美。此外,通过弯循环弯曲(9000次循环)、胶带黏附性测试发现,银网格柔性透明电极具有良好的減稳定性。未来可用于制作触摸屏面板,透明电加热器。