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Open AccessArticle

Luminescent Properties of (004) Highly Oriented Cubic Zinc Blende ZnO Thin Films

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Instituto Politécnico Nacional, Sección de Estudios de Posgrado e Investigación, Escuela Superior de Ingeniería Mecánica y Eléctrica Unidad Azcapotzalco. Av. Granjas No. 682, Colonia Santa Catarina, Del. Azcapotzalco, CP. 02250 Ciudad de México, Mexico
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Departamento de Física del Centro de Investigación y de Estudios Avanzados del IPN, C.P. 07351 Ciudad de México, Mexico
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Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del Instituto Politécnico Nacional, Av. IPN No. 2580, Col. Barrio La Laguna Ticomán, C.P. 07340 Ciudad de México, Mexico
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Benemérita Universidad Autónoma de Puebla, Facultad de Ciencias Físico Matemáticas, Av. San Claudio y 18 sur, Col. San Manuel (CU), Puebla, Puebla, C.P. 72570, Mexico
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Instituto Politécnico Nacional, UPIIH, San Agustín Tlaxiaca, 42162, Hidalgo, Mexico
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Author to whom correspondence should be addressed.
Departamento de Física del Centro de Investigación y de Estudios Avanzados del IPN (Affiliation 2) of sabbatical year 2017–2018.
Materials 2019, 12(20), 3314; https://doi.org/10.3390/ma12203314
Received: 21 May 2019 / Revised: 20 June 2019 / Accepted: 21 June 2019 / Published: 11 October 2019
(This article belongs to the Section Thin Films)
Photoluminescence properties of cubic zinc blende ZnO thin films grown on glass substrates prepared by the spray pyrolysis method are discussed. X-ray diffraction spectra show the crystalline wurtzite with preferential growth in the (002) orientation and a metastable cubic zinc blende phase highly oriented in the (004) direction. Raman measurements support the ZnO cubic modification growth of the films. Photoluminescence (PL) spectra of zinc blende films are characterized by a new PL band centerd at 2.70 eV, the blue emission, in addition there are two principal bands that are also found in hexagonal ZnO films with the peak positions at 2.83 eV and 2.35 eV. The origin of the 2.70 eV band can be attributed to transitions from Zn-interstitial to Zn-vacancies. It is also important to mention that the PL intensity of the 2.35 eV band of the zinc blende thin films is relatively higher than in the band present in hexagonal ZnO films, which means that zinc blende films have more oxygen vacancies, as was corroborated by means of the energy dispersion spectroscopy (EDS) measurements. PL spectra at 77 °K were measured and the 2.70 eV band was confirmed for the zinc blende films. Some PL bands of cubic films also appeared for the hexagonal phase, which is due, to a certain extent, to the similar ions stacking of both wurtzite and zinc blende symmetries. View Full-Text
Keywords: highly oriented crystals; ZnO thin films; spray pyrolysis technique; photoluminescence; wurtzite; zinc blende; optical properties highly oriented crystals; ZnO thin films; spray pyrolysis technique; photoluminescence; wurtzite; zinc blende; optical properties
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MDPI and ACS Style

Muñoz-Aguirre, N.; Martínez-Pérez, L.; Muñoz-Aguirre, S.; Flores-Herrera, L.A.; Vergara Hernández, E.; Zelaya-Angel, O. Luminescent Properties of (004) Highly Oriented Cubic Zinc Blende ZnO Thin Films. Materials 2019, 12, 3314.

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