Structural and optical properties of CdTe nanocrystals embedded in KH2PO4 (KDP) dielectric crystal

• Published in: Journal of Optoelectronics and Advanced Materials Vol. 10; no. 11; pp. 3051 - 3053
• Main Authors: Bensouici, A, Plaza, J L, Halimi, O, Boudine, B, Sebais, M, Dieguez, E
• Format: Journal Article
• Language: English
• Published: 01-11-2008
• ISSN: 1454-4164

In the present work, KH2PO4 (KDP) crystals doped with CdTe have been grown in aqueous solution supersaturated at 50 deg C using the lowering temperature method. X-ray diffraction spectra have shown that CdTe inclusions have been obtained with an average size of about 24nm. The optical gap (Eg=2.85eV) was deduced from the UV-vis absorption spectra. The gap widening compared with bulk CdTe crystals could be due to the nanometric size of CdTe particles (-2nm), revealing the intrinsic quantum confinement effect of these nanocrystals. Nevertheless, following experimental results from structural and optical characterisation the estimation of the CdTe particles size data shows a great dispersion, which must be taking into account. Furthermore, the possibility of embedding II-VI CdTe nanoparticles in KDP crystalline matrix has been proved.