项目名称: 用于太阳能电池的有序金属/介质纳米结构高效光吸收器的研究
项目编号: No.11274344
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 陈沁
作者单位: 中国科学院苏州纳米技术与纳米仿生研究所
项目金额: 80万元
中文摘要: 光和微纳米结构的相互作用是当前光子学研究的热点。其中利用纳米陷光结构提高光吸收率是光能源利用和光探测研究中的关键技术之一。在太阳能电池研究中,国际上大多数研究采用金属纳米颗粒和光栅结构来提高光的吸收效率,具有对入射光角度敏感和窄带宽的限制性。面向薄膜太阳能电池的应用,本项目提出利用有序金属/介质纳米结构形成的人工超常材料来制作具有偏振不灵敏、全向和宽带特性的光吸收器。理论上通过数值模拟分析人工超常材料中结构和材料性质对其电磁参数的影响,研究光吸收与入射光频率、方向和偏振的关系,优化并实现界面的阻抗匹配来抑制表面反射损耗,以获得完全的光吸收,并利用纵向级联和横向嵌套级联结构进一步扩展光吸收带宽。实验中将研究不同金属材料及其制备工艺对器件性能的影响,还将开发基于图形转移技术的纳米加工技术,实现人工超常材料的高速低成本制备。本项目的研究结果将为提高薄膜太阳能电池的光吸收效率提供新的思路。
中文关键词: 表面等离激元;人工超材料;纳米光子学;太阳电池;光吸收器
英文摘要: The interaction of light and micro-nano structures is a hot topic in nanophotonics nowadays. To improve the light absorption efficiency, light-trapping based on nanostructures is one promising technique widely investigated in both solar energy and light detection research. Metal nanoparticles and gratings are usually used to improve the light absorption in the application in solar cells, however, they are suffering from the sensitivity of polarization and the narrow band properties. In this project, metamaterials are proposed to make a polarization-insensitive, omnidirectional and broadband absorber for the application in solar cells. Numerical simulation based on the finite-difference time-domain method is going to be carried out to investigate the effects of the dimensions and material properties on the electric and magnetic parameters of metamaterials, and analyze the absorption of light with different frequencies, directions and polarizations, and finally achieve an impedance matching to suppress the surface reflection loss for a perfect light absorption. Further, individual metamaterial absorbers will be cascadely integrated in eithor vertical or horizontal direction to consiste a combined broadband absorber. In experiment, different metals like Au, Ag, Al and Cu, and their manufacturing techniques will be
英文关键词: surface plasmon polariton;metamaterials;nanophotonics;solar cells;optical absorber