Abstract
Resonant Raman scattering experiments were employed to investigate composition dependence of exciton-phonon coupling and anharmonic phonon decay in CdSexTe1−x thin films with x values between 0 and 1. The energy variations of the CdTe- and CdSe-like longitudinal optical phonons (LO) with compositions were found to be well described by the random-element isodisplacement model. Fröhlich interaction was enhanced in CdSexTe1−x films with x values of ∼0.2, and strong additive combination phonons mLO1 + nLO2 have been observed, here, m and n are integers describing Raman scattering orders. The experimental results demonstrate that the anharmonic decay of the additive combination LO1 + LO2 mode was dominated by the cascade relaxation process, namely, the decay can be described by successive decaying of the individual LO1 and LO2 modes. Transverse acoustical phonon (TA), whose phonon density of states varies rapidly with alloy composition, played critical role in the anharmonic decay for the CdSexTe1−x films with different compositions.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
