Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers
Transparent thin layers of cobalt-doped ZnO were produced with the pulsed laser deposition method. The cobalt content of the original solid solution was 20% at. The crystallographic structure was examined by X-ray diffraction, which showed that the fabricated layers crystallized in the wurtzite phas...
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MDPI AG
2023-02-01
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| author | Piotr Potera Ihor S. Virt Bogumił Cieniek |
| author_facet | Piotr Potera Ihor S. Virt Bogumił Cieniek |
| author_sort | Piotr Potera |
| collection | DOAJ |
| description | Transparent thin layers of cobalt-doped ZnO were produced with the pulsed laser deposition method. The cobalt content of the original solid solution was 20% at. The crystallographic structure was examined by X-ray diffraction, which showed that the fabricated layers crystallized in the wurtzite phase and had a dominant orientation along the a-axis. The texture coefficient (increasing from <i>F</i> = 0.08 for the non-annealed layer to <i>F</i> = 0.94 for the annealed layer at 400 °C) and grain size (<i>D</i> = 110 ÷ 140 nm) were calculated. Optical constants, such as the refractive index <i>n</i> (1.62) and the extinction coefficient <i>k</i> (0.1 ÷ 0.4), were determined from the ultraviolet–visible–near-infrared transmission spectrum using the envelope method. The value of the optical band gap was determined, which is lower than for pure ZnO. Increasing the annealing temperature of the ZnO:Co layer increases the Urbach energy from 0.20 to 0.25 eV, which shows the difference in the type of growth defects in the ZnO matrix. |
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| language | English |
| last_indexed | 2024-03-11T09:11:07Z |
| publishDate | 2023-02-01 |
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| spelling | doaj.art-88adf567be854e36a2e607164fd42a4c2023-11-16T18:59:32ZengMDPI AGApplied Sciences2076-34172023-02-01134270110.3390/app13042701Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin LayersPiotr Potera0Ihor S. Virt1Bogumił Cieniek2Institute of Materials Engineering, College of Natural Sciences, University of Rzeszow, Pigonia 1, 35-310 Rzeszow, PolandInstitute of Physics, Mathematics, Economy and Innovation Technologies, Drogobych State Pedagogical University, Stryiska Street 3, 82100 Drogobych, UkraineInstitute of Materials Engineering, College of Natural Sciences, University of Rzeszow, Pigonia 1, 35-310 Rzeszow, PolandTransparent thin layers of cobalt-doped ZnO were produced with the pulsed laser deposition method. The cobalt content of the original solid solution was 20% at. The crystallographic structure was examined by X-ray diffraction, which showed that the fabricated layers crystallized in the wurtzite phase and had a dominant orientation along the a-axis. The texture coefficient (increasing from <i>F</i> = 0.08 for the non-annealed layer to <i>F</i> = 0.94 for the annealed layer at 400 °C) and grain size (<i>D</i> = 110 ÷ 140 nm) were calculated. Optical constants, such as the refractive index <i>n</i> (1.62) and the extinction coefficient <i>k</i> (0.1 ÷ 0.4), were determined from the ultraviolet–visible–near-infrared transmission spectrum using the envelope method. The value of the optical band gap was determined, which is lower than for pure ZnO. Increasing the annealing temperature of the ZnO:Co layer increases the Urbach energy from 0.20 to 0.25 eV, which shows the difference in the type of growth defects in the ZnO matrix.https://www.mdpi.com/2076-3417/13/4/2701zinc oxidePLDinterband absorptionrefractive indexextinction coefficientUrbach energy |
| spellingShingle | Piotr Potera Ihor S. Virt Bogumił Cieniek Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers Applied Sciences zinc oxide PLD interband absorption refractive index extinction coefficient Urbach energy |
| title | Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers |
| title_full | Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers |
| title_fullStr | Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers |
| title_full_unstemmed | Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers |
| title_short | Structure and Optical Properties of Transparent Cobalt-Doped ZnO Thin Layers |
| title_sort | structure and optical properties of transparent cobalt doped zno thin layers |
| topic | zinc oxide PLD interband absorption refractive index extinction coefficient Urbach energy |
| url | https://www.mdpi.com/2076-3417/13/4/2701 |
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