Crystal-chemical models of the defect system in nonstoichiometric and oxygen-doped ZnSe crystals

Freik, D. M.; Gurgula, Galyna; Mezhylovska, L. I.

doi:10.1134/s002016851109007x

Cited by 1 publication

(1 citation statement)

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“…Contrary, the PL intensity of silica is known to be characterized by a weak enhancement of intensity with increasing temperature [76]. According to the literature data, this orange band can be attributed to the so-called self-activated (SA) luminescence associated with some complex defects such as: donor-acceptor pairs related to Zn-vacancies as the acceptor species and V Se or Zn i as the donor species or complex donors like (V Se -V Zn )-V Zn or (V Zn 2− -V Se + ) − [80][81][82][83][84][85]. Some authors [86,87] believe that the centre of the self-activated orange ZnSe radiation includes oxygen, which stabilizes complexes of intrinsic point defects.…”

Section: Pl Datamentioning

confidence: 92%

Radiative recombination in zinc blende ZnSe nanocrystals ion-beam synthesized in silica

Пархоменко¹,

Власукова²,

Комаров³

et al. 2022

J. Phys. D: Appl. Phys.

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Zinc selenide nanocrystals (NCs) were successfully synthesized in silicon dioxide (silica grown on a silicon wafer) by high-fluence implantation of Zn+ and Se+ ions with subsequent rapid thermal annealing at 1000°C for 3 min. The high crystalline quality of the zinc blende ZnSe nanoclusters was proven by transmission electron microscopy with selected area electron diffraction and Raman spectroscopy. Low-temperature photoluminescence (PL) reveals the recombination of excitons in ZnSe, what further indicates a good crystalline quality of the synthesized nanocrystals. PL analysis shows a strong coupling of phonons and excitons. The Huang−Rhys parameter of the longitudinal optical phonon in the exciton transition S is in the range of 0.6−0.7. Despite the excellent quality of the ZnSe NCs synthesized in silica, defect states inside the NCs or at the NCs/SiO2 interface with activation energies of 0.1–0.2, 0.45 and 0.67 eV play a crucial role in radiative recombination.

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