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Identifying the influence of the intrinsic defects in Gd-doped ZnO thin-films
Gd-doped ZnO thin films were prepared using pulsed laser deposition at different oxygen pressures and varied Gd concentrations. The effects of oxygen deficiency-related defects on the Gd incorporation, optical and structural properties, were explored by studying the impact of oxygen pressure during...
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Published in: | Journal of applied physics 2016-02, Vol.119 (6) |
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container_title | Journal of applied physics |
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creator | Flemban, T. H. Sequeira, M. C. Zhang, Z. Venkatesh, S. Alves, E. Lorenz, K. Roqan, I. S. |
description | Gd-doped ZnO thin films were prepared using pulsed laser deposition at different oxygen pressures and varied Gd concentrations. The effects of oxygen deficiency-related defects on the Gd incorporation, optical and structural properties, were explored by studying the impact of oxygen pressure during deposition and post-growth thermal annealing in vacuum. Rutherford Backscattering Spectrometry revealed that the Gd concentration increases with increasing oxygen pressure for samples grown with the same Gd-doped ZnO target. Unexpectedly, the c-lattice parameter of the samples tends to decrease with increasing Gd concentration, suggesting that Gd-defect complexes play an important role in the structural properties. Using low-temperature photoluminescence (PL), Raman measurements and density functional theory calculations, we identified oxygen vacancies as the dominant intrinsic point defects. PL spectra show a defect band related to oxygen vacancies for samples grown at oxygen deficiency. |
doi_str_mv | 10.1063/1.4941434 |
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H. ; Sequeira, M. C. ; Zhang, Z. ; Venkatesh, S. ; Alves, E. ; Lorenz, K. ; Roqan, I. S.</creator><creatorcontrib>Flemban, T. H. ; Sequeira, M. C. ; Zhang, Z. ; Venkatesh, S. ; Alves, E. ; Lorenz, K. ; Roqan, I. S.</creatorcontrib><description>Gd-doped ZnO thin films were prepared using pulsed laser deposition at different oxygen pressures and varied Gd concentrations. The effects of oxygen deficiency-related defects on the Gd incorporation, optical and structural properties, were explored by studying the impact of oxygen pressure during deposition and post-growth thermal annealing in vacuum. Rutherford Backscattering Spectrometry revealed that the Gd concentration increases with increasing oxygen pressure for samples grown with the same Gd-doped ZnO target. Unexpectedly, the c-lattice parameter of the samples tends to decrease with increasing Gd concentration, suggesting that Gd-defect complexes play an important role in the structural properties. Using low-temperature photoluminescence (PL), Raman measurements and density functional theory calculations, we identified oxygen vacancies as the dominant intrinsic point defects. 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Unexpectedly, the c-lattice parameter of the samples tends to decrease with increasing Gd concentration, suggesting that Gd-defect complexes play an important role in the structural properties. Using low-temperature photoluminescence (PL), Raman measurements and density functional theory calculations, we identified oxygen vacancies as the dominant intrinsic point defects. PL spectra show a defect band related to oxygen vacancies for samples grown at oxygen deficiency.</description><subject>Applied physics</subject><subject>Backscattering</subject><subject>Density functional theory</subject><subject>Gadolinium</subject><subject>Lattice vacancies</subject><subject>Optical properties</subject><subject>Oxygen</subject><subject>Photoluminescence</subject><subject>Point defects</subject><subject>Pulsed laser deposition</subject><subject>Pulsed lasers</subject><subject>Thin films</subject><subject>Zinc oxide</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqd0M1KAzEUBeAgCtbqwjcYcKWQmr_JJEspWoVKN7pxE6Y3iaa0mTFJhb69U1pw7-rC4eNcOAhdUzKhRPJ7OhFaUMHFCRpRojRu6pqcohEhjGKlG32OLnJeEUKp4nqEXl-siyX4XYifVflyVYh-vXURXNX5Y1BSiDlAZZ13UPKQVDOLbdc7W33ExaBCxD6sN_kSnfl2nd3V8Y7R-9Pj2_QZzxezl-nDHAOXrGBdS_C0VksgVDotmsYraLn2XHDn60YowbjmlpEaFACTkoNsiBXAlxII42N0c-jtU_e9dbmYVbdNcXhpGGVUKcXVXt0eFKQu5-S86VPYtGlnKDH7tQw1x7UGe3ewGUJpS-ji__BPl_6g6a3nv36DdpM</recordid><startdate>20160214</startdate><enddate>20160214</enddate><creator>Flemban, T. 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source | American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list) |
subjects | Applied physics Backscattering Density functional theory Gadolinium Lattice vacancies Optical properties Oxygen Photoluminescence Point defects Pulsed laser deposition Pulsed lasers Thin films Zinc oxide |
title | Identifying the influence of the intrinsic defects in Gd-doped ZnO thin-films |
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