Excitonic luminescence of iodine-intercalated HfS${}_2$

Abstract

Photoluminescence from bulk HfS${}_2$ grown by the chemical vapor transport method is reported. A series of emission lines is apparent at low temperature in the energy range of 1.4 - 1.5 eV. Two groups of the observed excitonic transitions followed by their replicas involving acoustic and optical phonons are distinguished using classical intensity correlation analysis. The emission is attributed to the recombination of excitons bound to iodine (I${}_2$) molecules intercalated between layers of HfS${}_2$. The I${}_2$ molecules are introduced to the crystal during the growth as halogen transport agents in the growth process. Their presence in the crystal is confirmed by secondary ion mass spectroscopy.

arXiv comment5 pages, 6 figures + SM

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Cited by in corpus (2)

• The effect of temperature and excitation energy on Raman scattering in bulk HfS${}_2$
• Pressure-induced optical anisotropy of HfS${}_2$