ZnS:Mn量子点嵌入SixGe1-x光子晶体复合结构的构筑及其光学特性研究

项目名称： ZnS:Mn量子点嵌入SixGe1-x光子晶体复合结构的构筑及其光学特性研究

项目编号： No.61275047

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 孟祥东

作者单位： 吉林师范大学

项目金额： 75万元

中文摘要： 本项目研究SixGe1-x光子晶体对太阳光谱和ZnS:Mn量子点发光的复合调控和收集光子的物理机制，优化ZnS:Mn/SixGe1-x复合结构是获得高效硅叠层太阳电池的关键科学问题。本项目将胶体晶体自组装和离子液体中电沉积法相结合，提出原位构筑反蛋白石结构SixGe1-x三维光子晶体的新方法；在此结构的空隙处填充ZnS:Mn核壳量子点组装成ZnS:Mn/SixGe1-x的复合结构。研究SixGe1-x光子晶体在离子液体中共沉积过程的生长机理，分析沉积条件对硅锗合金能带结构的影响。研究利用椭偏仪测试和拟合获得硅锗合金膜的色散关系；基于有限时域差分法模拟计算SixGe1-x光子晶体的光谱特性。研究SixGe1-x光子晶体的光子带隙对ZnS:Mn量子点的发光强度、荧光寿命的调控效应；分析此复合结构对太阳光谱的利用效率。上述科学问题的研究，为研制新一代太阳能光伏器件提供理论依据和实验基础。

中文关键词： 量子点；光子晶体；非晶硅电池；离子液体；光致发光

英文摘要： In the project, studying the physical mechanism of light extraction and control of SixGe1-x photonic crystals for properties of ZnS:Mn quantum dots and solar spectrum and optimizing ZnS:Mn/SixGe1-x composite structure for enhanced high efficiency of silicon tandem solar cells are one of key scientific issues. The SixGe1-x three-dimensional photonic crystals are directly fabricated by colloidal crystal template-assisted electrodeposition method from ionic liquids and ZnS:Mn quantum-dot-based SixGe1-x composite materials are assembled by infiltration method. The growth mechanism of co-deposition process of SixGe1-x photonic crystals in ionic liquids is studied and the influence of deposition conditions on silicon germanium alloy band gap is discussed. The optical constants of SixGe1-x films are measured by Ellipsometer, based on an effective medium model for obtaining the dispersion relation of the SixGe1-x films. Further we study spontaneous emission from ZnS:Mn quantum dots embedded in SixGe1-x photonic crystals. The spectral distribution and time-dependent decay of light emitted from ZnS:Mn quantum dots are controlled by the host SixGe1-x photonic crystal. We will also optimize the ZnS:Mn/SixGe1-x photonic crystal intermediate reflector with inverse opal structure and make it satisfy the characteristic of selec

英文关键词： Quantum dots；Photonic crystals；Amorphous silicon solar cell；Ionic liquids；Photoluminescent