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Journal of Physical Studies 15(4), Article 4702 [8 pages] (2011)
DOI: https://doi.org/10.30970/jps.15.4702 EFFECTS OF EXCITON--LONGITUDINAL OPTICAL PHONON INTERACTION AND QUANTUM CONFINEMENT ON EXITON BINDING ENERGIES IN ZnS1–xSex/ZnS SINGLE QUANTUM WELLSChikara Onodera
Electronic Engineering Course, Aomori Prefectural Towada Technical Senior High School, |
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We study the effects of the exciton-longitudinal optical (LO) phonon interaction and quantum confinement on the exciton binding energies in ZnS$_{1-x}$Se$_{x}$/ZnS single quantum wells (SQWs) for an Se alloy content ($x$) range of 0.1-0.3. In narrow ZnS$_{1-x}$Se$_{x}$/ZnS SQWs, the heavy-hole (light-hole) exciton binding energy calculated by taking into account the exciton-LO phonon interaction for values of $x$ in the range of 0.2-0.3 (0.3) exceeds the LO phonon energy of ZnS$_{1-x}$Se$_{x}$. The difference between the maximum heavy-hole (light-hole) exciton binding energy for $x$ = 0.3 and the LO phonon energy is less than 1.5 meV (1.0 meV). This SQW shows a weak quantum confinement due to a small conduction-band offset.
PACS number(s): 73.21.Fg, 78.20.Bh, 81.05.Dz