Confined optical vibrations in CdTe quantum dots and clusters

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Rolo, AG (Author) Other; Vasilevskiy, MI (Author) Other; Gaponik, NP (Author) Other; Rogach, AL (Author) Other; Gomes, MJM (Author) Other

Journal

Title: Physica Status Solidi (B): Basic Research

Vol. 229

Pages: 433-437

ISSN: 0370-1972

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 22 Citations

Scopus - 23 Citations

Other information

Authenticus ID: P-000-RRJ

DOI: 10.1002/1521-3951(200201)229:1<433::aid-pssb433>3.0.co;2-w

Abstract (EN): Absorption of far-infrared (FIR) radiation and Raman scattering in CdTe nano-crystals (spherical quantum dots (QDs) of several nanometers in size) and Cd54Te32(SCH2CH2OH)(32)(8-) clusters prepared by colloidal synthesis were studied. Raman spectra of both QDs and clusters are dominated by a peak situated slightly below the bulk CdTe LO phonon frequency. Experimental FIR transmittance spectra of films containing CdTe clusters show a broad band between the bulk TO and LO phonon frequencies, while there is only a single dip at the Frohlich frequency observed for larger QDs. These observations are in agreement with the results of our numerical lattice dynamics calculations and previously published theoretical results based on a continuous model. It is suggested that the lattice dynamics of very small clusters is similar to that of large crystallites in the sense that there still exists the dispersion of optical vibration frequencies within the LO-TO band of bulk material.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5