Effects of Substrate Temperature on Optical, Structural, and Surface Properties of Metal-Organic Vapor Phase Epitaxy-Grown MgZnO Films

MgZnO possesses a tunable bandgap and can be prepared at relatively low temperatures, making it suitable for developing optoelectronic devices. Mg Zn O ( ~0.1) films were grown on sapphire by metal-organic vapor phase epitaxy under different substrate-growth temperatures of 350-650 °C and studied by...

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Veröffentlicht in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-12, Vol.14 (23), p.1957
Hauptverfasser: Liu, Jiamin, Xie, Deng, Feng, Zhe Chuan, Nafisa, Manika Tun, Wan, Lingyu, Qiu, Zhi-Ren, Wuu, Dong-Sing, Zhang, Chuanwei, Yiin, Jeffrey, Lin, Hao-Hsiung, Lu, Weijie, Klein, Benjamin, Ferguson, Ian T, Liu, Shiyuan
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Sprache:eng
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Zusammenfassung:MgZnO possesses a tunable bandgap and can be prepared at relatively low temperatures, making it suitable for developing optoelectronic devices. Mg Zn O ( ~0.1) films were grown on sapphire by metal-organic vapor phase epitaxy under different substrate-growth temperatures of 350-650 °C and studied by multiple characterization technologies like X-ray diffraction (XRD), spectroscopic ellipsometry (SE), Raman scattering, extended X-ray absorption fine structure (EXAFS), and first-principle calculations. The effects of on the optical, structural, and surface properties of the Mg Zn O films were studied penetratively. An XRD peak of nearly 35° was produced from Mg Zn O (0002) diffraction, while a weak peak of ~36.5° indicated MgO phase separation. SE measurements and analysis determined the energy bandgaps in the 3.29-3.91 eV range, obeying a monotonically decreasing law with increasing . The theoretical bandgap of 3.347 eV, consistent with the SE-reported value, demonstrated the reliability of the SE measurement. Temperature-dependent UV-excitation Raman scattering revealed 1LO phonon splitting and temperature dependency. Zn-O and Zn-Zn atomic bonding lengths were deduced from EXAFS. It was revealed that the surface Mg amount increased with the increase in . These comprehensive studies provide valuable references for Mg Zn O and other advanced materials.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14231957