TITLE:
Surface Quantum-Dimensional Photocarrier Recombination in CdTe Microcrystals
AUTHORS:
Alexander Viktorovich Sel’kin, Nosirjon Khaydarovich Yuldashev
KEYWORDS:
Photoluminescence, CdTe Microcrystals, p-CdTe/n-CdS Film Heterostructure, Quantum-Dimensional Effect, Exciton-Polariton
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.11 No.3,
March
13,
2023
ABSTRACT: The scope of the study is the spectra of low-temperature (T = 2K) photoluminescence of a p-CdTe/n-CdS film heterostructure comprising a monolayer of CdTe microcrystals, where a single microcrystalline particle is typically one micron in size. Focus is made on the dominant band of “super-hot” emission appearing in the spectral region located in energy above the fundamental absorption edge of a CdTe bulk crystal. A theoretical model has been developed that assumes the existence of a space-charge layer inside a microcrystal, which leads to the formation of a triangular potential well for an electron near the surface. The anomalous emission band arises as a result of the optical transitions of electrons from near-surface levels of spatial quantization to valence band states.