Optical spectroscopy of near-surface excitonic states

[摘要] We have studied the low temperature excitonic reflectance and luminescence spectra of CdS1-xSex solid solutions with a near-surface excitonic potential well formed by excessive Se. The reflectance spectra were obtained at different angles of incidence for both s- and p-polarization components of light. New striking spectral features due to exciton confinement and quantization in the surface region were observed. For various samples, the generalized Morse surface potential was proved to be a good approximation in describing the experimental data. It is shown that the resonance excitonic luminescence is largely governed by the emission from excitations localized in the well. (C) 2000 Elsevier Science S.A. All rights reserved.

[发布日期] 2000-09-03

[效力级别]  Proceedings Paper

[关键词] optical properties;reflection spec.;luminescence;surface and interface states