硫化锌/硫化镉低维量子结构的激子-声子耦合及其对发光性质的影响

项目名称： 硫化锌/硫化镉低维量子结构的激子-声子耦合及其对发光性质的影响

项目编号： No.61474096

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 曾祥华

作者单位： 扬州大学

项目金额： 82万元

中文摘要： 激子-声子耦合效应是决定半导体光电性质，特别是发光性质的关键因素之一，与半导体材料的维度、形貌、尺寸、掺杂等密切相关。由于量子限制效应和表面效应等原因，半导体低维量子结构的激子-声子耦合将展现一些新的物理特征，导致其宏观光电性质发生相应的变化。本申请项目在ZnS、CdS低维量子结构材料可控制备的基础上，通过对其微结构和发光性质的系统研究，结合理论分析，探索不同低维量子结构的激子-声子耦合效应，寻求低维量子结构的维度、形貌、尺寸、掺杂等可控参量与激子-声子耦合的关联规律，确定影响激子-声子耦合的关键因素；同时研究激子-声子耦合中Fr?hlich势与形变势的竞争关系，以及激子-声子耦合对ZnS、CdS低维量子结构发光性质的影响，最终获得对半导体低维量子结构中激子-声子耦合一般性规律的认识，为深入理解半导体发光机理，设计、发展新型的半导体发光材料和器件提供科学依据。

中文关键词： 半导体低维结构；硫化锌；硫化铬；激子-声子耦合；发光特性

英文摘要： Exciton-phonon (ex-ph) coupling related with the structure, morphology and size of the material will determine the optoelectronic properties. Quantum confinement and surface effect is more prominent for nanomaterial compared to the bulk material, and the ex-ph coupling shows more optoelectronic properties over than that of bulk material, which will be in favor of preparing high performance of semiconductors. In this project, firstly we will prepare ZnS (CdS) low dimensional nanostructures and ZnS/CdS superlattice, then the optical properties such as optical emission and the ex-ph coupling will be investigated by the PL spectra the resonant micro Raman scattering measurements, and the effects of ex-ph on the structure, defects and doping will be studied in order to find out the main effect which dominates the ex-ph coupling, additionally to obtain the relations of the competition between Fr?hlich potential and deformation potential in ex-ph coupling strength. By systematically studying the ex-ph coupling for low dimensional nanostructures, the relations of ex-ph coupling with the surface effects and quantum confinement effects can be obtained, from those relationships we can explore the mechanism of the electron-phonon coupling and obtain the general law of the ex-ph coupling.

英文关键词： low dimensional structure of semiconductor;ZnS;CdS;exciton-phonon coupling;optical properties