Structural, optical, and electrical properties of thioglycolic acid-capped CdTe quantum dots thin films

被引：0

作者：

Moradian, Rostam ^{[1
,2
,3
]}

Elahi, Mohammad ^{[1
]}

Hadizadeh, Ahmad ^{[1
]}

Roshani, Mahmoud ^{[4
]}

Taghizadeh, Atefeh ^{[1
]}

Sahraei, Reza ^{[1
]}

机构：

[1] Razi Univ, Dept Phys, Kermanshah, Iran

[2] Razi Univ, Nano Sci & Nano Technol Res Ctr, Kermanshah, Iran

[3] Inst Studies Theoret Phys & Math IPM, Dept Nanosci, Computat Phys Sci Res Lab, Tehran, Iran

[4] Ilam Univ, Dept Chem, Ilam, Iran

来源：

INTERNATIONAL NANO LETTERS | 2013年 / 3卷 / 01期

关键词：

CdTe quantum dots; Thin films; Optical properties; Electrical conductivity;

D O I：

10.1186/2228-5326-3-56

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 degrees 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.

引用

页数：6