Related Experiment Video
Updated: May 31, 2026
17:14
Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
Optical characterization of a Cd(0.85)Mg(0.15)Se mixed crystal
Summary
This study optically characterized Cd(0.85)Mg(0.15)Se mixed crystals. Temperature-dependent contactless electroreflectance and photoreflectance revealed excitonic transitions A and C, detailing their energy and broadening.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Optoelectronics
Background:
- Wurtzite-type CdSe-based alloys are promising for optoelectronic applications.
- Understanding their band structure and excitonic properties is crucial for device design.
Purpose of the Study:
- To optically characterize Bridgman-grown Cd(0.85)Mg(0.15)Se mixed crystals.
- To investigate near-band-edge interband transitions using temperature-dependent optical techniques.
- To analyze the temperature dependence of excitonic transition energies and broadening.
Main Methods:
- Temperature-dependent contactless electroreflectance (CER) and photoreflectance (PR) spectroscopy.
- Spectroscopic analysis in the temperature range of 15-400 K.
- Lineshape fitting to determine transition energies and broadening parameters.
Main Results:
- Observed excitonic transitions A (band edge) and C (spin-orbit splitting) in CER/PR spectra.
- Determined transition energies and broadening functions for excitons A and C.
- Evaluated parameters describing the temperature dependence of these excitonic features.
Conclusions:
- The study provides a detailed optical characterization of Cd(0.85)Mg(0.15)Se.
- The temperature-dependent behavior of excitonic transitions was successfully analyzed.
- This work contributes to understanding the fundamental optoelectronic properties of II-VI semiconductor alloys.
