Etching of latent tracks in amorphous SiO2 and Si3N4: Simulation and experiment

The synthesis of CdTe nanocrystals (NCs) is performed by electrochemical deposition into prepared ion tracks in a a‐SiO2/Si‐n template. As a result, CdTe NCs are obtained in a wurtzite (WZ) crystal phase. The measurement of the current–voltage characteristics shows that the CdTe (WZ NC)/SiO2/Si system obtained in this way has n‐type conductivity. Computer simulations using the CRYSTAL computer code show good agreement between experimental and calculated lattice parameters. The theoretical calculations also show that the crystal has a direct bandgap at the Γ point of the Brillouin zone.

show abstract

“…[ 11 ] The conical shape was confirmed by transmission electron microscope studies [ 12,13 ] and atomic‐force microscope. [ 14 ]…”

Section: Experimental Section and Resultsmentioning

confidence: 99%

“…[11] The conical shape was confirmed by transmission electron microscope studies [12,13] and atomic-force microscope. [14] The ECD)of CdTe was conducted using a solution 1 M CdCl 2 þ 1 mM TeO 2 . CdCl 2 was dissolved in water and TeO 2 in a minimal amount of concentrated hydrochloric acid.…”

Section: Experimental Section and Resultsmentioning

confidence: 99%

CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Balakhayeva

Аkilbekov

Baimukhanov

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…From a fundamental point of view, interest in these materials is due to the possibility of obtaining new knowledge in the field of studying the mechanisms of defect formation, tread formation and radiation resistance of materials [7][8][9]. At the moment, among all nitride ceramics, latent tracks from heavy ions were found in Si 3 N 4 [10,11], while for AlN, the formation of latent tracks was not found, which the authors of [12] determined with a high threshold bias energy for AlN (>34 keV/nm) required to form tracks. In this regard, high resistance to radiation damage, as well as good insulating and heat-conducting properties, make ceramics based on AlN one of the most promising materials in the field of nuclear energy, structural materials for reactor building, dosimetry, etc.…”

Section: Introductionmentioning

confidence: 99%

Study of Changes in Optical and Heat-Conducting Properties of AlN Ceramics under Irradiation with Kr15+ and Xe22+ Heavy Ions

2020

View full text Add to dashboard Cite

AlN-based ceramics have great prospects for use in the field of structural materials for reactors of the new generation of GenIV, as well as dosimetric and optical devices. Interest in them is due to their unique physical and chemical properties, high resistance to degradation and excellent insulating properties. This work is devoted to the study of changes in the optical and heat-conducting properties of AlN ceramics as a result of irradiation with Kr15+ and Xe22+ heavy ions with energies close to those of fission fragments of uranium nuclei, and fluences 1014–1015 ion/cm2. During the study, dose relationships of changes in the optical properties of ceramics were established, as well as the effect of the type of ions on the degree of radiation damage and deterioration of optical characteristics. It has been found that an increase in the irradiation dose for Kr15+ ions leads to a slight increase in the depth of electron traps, while for samples irradiated with Xe22+ ions there is a sharp increase in the depth of occurrence from 5 to 20%, depending on the irradiation dose. For samples irradiated with Xe22+ ions, the greatest decrease in thermal conductivity was 19%, while for ceramics irradiated with Kr15+ ions, the maximum decrease was not more than 10%. The results show a significant resistance of ceramics to radiation damage by Kr15+ ions and negative effects, leading to a decrease in the resistance of optical and conductive properties of ceramics when irradiated with Xe22+ ions with doses higher than 5 × 1014 ion/cm2. Using the X-ray diffraction method, the dependences of structural distortions and changes in dislocation density in the structure of ceramics on the radiation dose were established. It has been determined that the main structural changes are associated with the fragmentation of grains, which result in an increase in the dislocation density, as well as deformation and distortion of the crystal lattice as a result of the formation of complex defects in the structure.

show abstract

“…At present, porous matrices based on alumina (Al 2 O 3 ) , titania (TiO 2 ), different polymers are the most frequently used templates for creating nanoobject arrays . However, for many applications it is more interesting to use templates based on silicon derivatives, such as SiO 2 or Si 3 N 4 , which allow to adapt the obtained nanostructures to standard industrial technologies . To obtain silicon oxide templates with pores having diameters from 50 nm, one can use the technology of swift heavy ions, which involves irradiating the material with the subsequent etching of the formed latent tracks in the presence of a selective etching agent.…”

Section: Introductionmentioning

confidence: 99%

Express Method of Estimation of Etched Ion Track Parameters in Silicon Dioxide Template

Yakimchuk

Bundyukova

Smirnov³

et al. 2018

Physica Status Solidi (b)

View full text Add to dashboard Cite

It is proposed to use the ellipsometry as an express method of estimating etched ion track parameters in a silicon dioxide template. Ellipsometric studies are carried out on a series of SiO2/Si templates with pores in the silicon oxide layer. Using the standard model of the interaction of a polarized light beam with a layered structure of silicon oxide on silicon, the basic parameters of the pores are determined through mathematical transformations. In order to determine the validity of the proposed model the results obtained with the ellispometry were compared with the data of scanning electron microscopy. Limitations of the proposed method are discussed.

show abstract

Etching of latent tracks in amorphous SiO2 and Si3N4: Simulation and experiment

Cited by 20 publications

References 12 publications

CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties

CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Study of Changes in Optical and Heat-Conducting Properties of AlN Ceramics under Irradiation with Kr15+ and Xe22+ Heavy Ions

Express Method of Estimation of Etched Ion Track Parameters in Silicon Dioxide Template

Contact Info

Product

Resources

About

Etching of latent tracks in amorphous SiO2 and Si3N4: Simulation and experiment

Cited by 20 publications

References 12 publications

CdTe Nanocrystal Synthesis in SiO2/Si Ion‐Track Template: The Study of Electronic and Structural Properties

CdTe Nanocrystal Synthesis in SiO2/Si Ion‐Track Template: The Study of Electronic and Structural Properties

Study of Changes in Optical and Heat-Conducting Properties of AlN Ceramics under Irradiation with Kr15+ and Xe22+ Heavy Ions

Express Method of Estimation of Etched Ion Track Parameters in Silicon Dioxide Template

Contact Info

Product

Resources

About

CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties

CdTe Nanocrystal Synthesis in SiO₂/Si Ion‐Track Template: The Study of Electronic and Structural Properties