Optical Characterization of CdSe1 – xTex Nanocrystals Grown in Borosilicate Glass

Authors Y.M. Azhniuk1,2 , A.V. Gomonnai1,2 , Yu.I. Hutych1, V.V. Lopushansky1 , D.R.T. Zahn3

1Institute of Electron Physics, NAS of Ukraine, 21, Universytetska St., 88017 Uzhhorod, Ukraine

2Uzhhorod National University, 46, Pidhirna St., 88000 Uzhhorod, Ukraine

3Semiconductor Physics, Chemnitz University of Technology, D-09107, Chemnitz, Germany

Issue Volume 14, Year 2022, Number 4
Dates Received 12 April 2022; revised manuscript received 08 August 2022; published online 25 August 2022
Citation Y.M. Azhniuk, A.V. Gomonnai, Yu.I. Hutych, et al., J. Nano- Electron. Phys. 14 No 4, 04017 (2022)
DOI https://doi.org/10.21272/jnep.14(4).04017
PACS Number(s) 78.67.Bf
Keywords Nanocrystals (3) , Diffusion-limited growth, Photoluminescence (17) , Raman spectroscopy (18) .

CdSe1 – xTex nanocrystals (NCs) were obtained by diffusion-limited growth in borosilicate glass and studied by optical absorption, photoluminescence (PL), and Raman spectroscopy. Several Raman-based approaches to determine the NC chemical composition were analyzed. Based on the Raman data, it is shown that for CdSe1 – xTex NCs with intermediate x (0.4 ( x ( 0.6) the Te content slightly decreases with the thermal treatment temperature and duration. Confinement-related maxima in the optical absorption spectra of glass-embedded CdSe1 – xTex NCs enable their average size to be estimated, while their smeared appearance reveals a noticeable size dispersion. A rather narrow near-bandgap PL peak with a small Stokes shift dominates in the PL spectra of glass-embedded CdSe1 – xTex NCs, while a lower-energy surface-mediated PL band appears only as a shoulder and vanishes with increasing Te content.

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