Surface and confined optical phonons in CdSxSe1-x nanoparticles in a glass matri

2019-10-10 15:11:37

optical spectra surface confined phonons

责任者: Roy, A.;Sood, A.K. 单位: Dept. of Phys., Indian Inst. of Sci., Bangalore, India 来源出处: Physical Review B (Condensed Matter)(Phys. Rev. B, Condens. Matter (USA)),1996/05/01,53(18):12127-32 摘要: We report first- and higher-order Raman scattering from the surface and confined optic phonons in CdS0.65Se0.35 and pure CdS nanoparticles embedded in glass matrix. The average particle sizes and size distribution have been estimated from the quantitative comparison of the blue-shifted optical-absorption spectra with the calculations based on the tight-binding model. The first-order asymmetric Raman line shape has been analyzed by including both the confined optic modes and the surface modes. The average particle sizes so obtained from this analysis compare well with those estimated from the optical-absorption spectra. The observed frequencies of the surface modes have been compared with the results of the dielectric response function model 关键词: cadmium compounds;dielectric function;II-VI semiconductors;impurity absorption spectra;nanostructured materials;particle size;phonon spectra;Raman spectra;semiconductor doped glasses;surface phonons;CdSxSe1-x nanoparticles;glass matrix;confined optical phonons;surface optical phonons;semiconductor;average particle sizes;size distribution;blue-shifted optical-absorption spectra;tight-binding model;first-order asymmetric Raman line shape;confined optic modes;dielectric response function model;CdSeS;CdS0.65Se0.35