Title of article
Structural, optical, and electrical properties of thioglycolic acid-capped CdTe quantum dots thin films
Author/Authors
Moradian, Rostam Department of Physics - Razi University , Elahi, Mohammad Department of Physics - Razi University , Hadizadeh, Ahmad Department of Physics - Razi University , Roshani, Mahmoud Department of Chemistry - Ilam University , Taghizadeh, Atefeh Department of Physics - Razi University , Sahrae, Reza Department of Chemistry - Ilam University
Pages
6
From page
1
To page
6
Abstract
Water-soluble cadmium telluride (CdTe) quantum dots (QDs) were synthesized using thioglycolic acid as capping
agent; this reaction was carried out at pH = 10.2 and refluxed at 100°C for 18 h. The CdTe QDs prepared at various
reflux times from 1 to 18 h were coated on the glass substrates to obtain thin films of the CdTe QDs with the same
thickness. The CdTe thin films were characterized by X-ray diffraction, ultraviolet-vis spectroscopy, and
photoluminescence spectroscopy. The absorption thresholds of the CdTe thin films are blueshifted by about
0.65 eV with respect to the bulk value (1.5 eV), due to the quantum size effect as expected from the nanocrystalline
nature of the CdTe QDs. X-ray diffraction showed that the films consisted of small CdTe nanocrystallites, 2.91 to
3.57 nm in size, showing quantum size effects. The effects of temperature on the electrical properties of the films
were studied in detail. Electrical resistivity measurements were carried out for different films in the temperature
range from 343 to 463 K. It is shown that activation energy increases by increasing the reflux time.
Keywords
CdTe quantum dots , Thin films , Optical properties , Electrical conductivity
Journal title
Astroparticle Physics
Serial Year
2013
Record number
2478151
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