Formation of Zn Nanoparticles in ZnO Crystal by Nd:YAG Laser Radiation: Experiments, Model and Application
Abstracts of the 32nd Scientific Conference 2016
Artūrs Medvids, Pāvels Onufrijevs, Edvīns Daukšta

The increase of ZnO single crystal conductivity up to 270 times after irradiation by Nd:YAG laser was observed. At the same time, the improvement of ZnO crystal quality by laser intensity 3.2 MW/cm2 takes place. The further increase of laser intensity led to emergence of cracks on the irradiated surface of the crystal. At the laser intensity 290.0 MW/cm2 Zn nanoparticles were formed. The formation mechanism of Zn nanoparticles by the laser is explained by Thermogradient effect. According to the effect, laser radiation leads to generation and redistribution of point defects. In our case, the generation of zinc interstitials (Zni) and zinc vacancies (VZn) pairs takes place. It is explained by low formation energy of these defects in ZnO crystal in comparison to other native point defects. Therefore, it is more likely that during irradiation VZn and Zni are formed. The gradient of temperature field induced by laser radiation leads to redistribution of the point defects and the drift of Zni atoms to the irradiated surface of the sample takes place. This was proved by huge increase of electrical conductivity up to 300 times. Moreover, the topography change was not observed till laser intensity 290.0 MW/cm2. The increase of Zni atoms’ concentration at the irradiated surface of the sample at certain concentration leads to the agglomeration of Zni atoms forming Zn nanoparticles.


Atslēgas vārdi
Zn, nanoparticles, ZnO, Nd:YAG laser

Medvids, A., Onufrijevs, P., Daukšta, E. Formation of Zn Nanoparticles in ZnO Crystal by Nd:YAG Laser Radiation: Experiments, Model and Application. No: Abstracts of the 32nd Scientific Conference, Latvija, Riga, 17.-19. februāris, 2016. Riga: Institute of Solid State Physics University of Latvia, 2016, 131.-131.lpp.

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English (en)
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