Defects in Rutile. I. Electron Paramagnetic Resonance of Interstitially Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi></mml:math>-Type Rutile

Kingsbury, Paul I.; Ohlsen, W. D.; Johnson, Owen

doi:10.1103/physrev.175.1091

Cited by 61 publications

(14 citation statements)

References 21 publications

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“…These states originate from surface or lattice defects. The majority of published work [7,[20][21][22][23] indicates that these states correspond to the absence of oxygen atoms (V O ) and are 0.5-0.8 eV below the conduction band [21,23]. The radiative recombination could occur either with the photogenerated holes (in the "bulk") or with surface holes ({Ti IV -O 2− -Ti IV }-O • ).…”

Section: Resultsmentioning

confidence: 99%

Characterization of TiO2 Nanoparticles in Langmuir-Blodgett Films

Coutinho

Barbosa

2006

J Fluoresc

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In this work we have synthesized TiO2 nanoparticles, using either a sol-gel base catalysed process in the interior of CTAB reversed micelles (TiO2 CTAB sol), or the neutralization of a TiO2/H2SO4 solution in the interior of AOT reversed micelles. From the absorption and emission data of the TiO2 nanoparticles it is possible to conclude that in the sol-gel route there remains alkoxide groups in the structure, originating transitions lower than the energy gap of TiO2 semiconductor. These transitions disappear in the neutralization procedure, where the alkoxide groups are absent in the structure. We have assigned the observed indirect and direct optical transitions according to the anatase band structure. TiO2 Langmuir-Blodgett (LB) films were prepared either by direct deposition of titanium isopropoxide or by deposition of the TiO2 CTAB sol. These films showed photoluminescence, which was attributed to band-gap emission and to surface recombination of defect states.

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Section: Resultsmentioning

confidence: 99%

Characterization of TiO2 Nanoparticles in Langmuir-Blodgett Films

Coutinho

Barbosa

2006

J Fluoresc

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“…[3][4][5][6][7] Many of the previous investigations of defects have focused on reduced crystals where oxygen vacancies, introduced during or after growth, significantly increase the electrical conductivity. [8][9][10][11] In contrast, our current report describes results obtained from colorless ͑fully oxidized͒ TiO 2 crystals that contain small concentrations of doubly ionized oxygen vacancies. These doubly ionized vacancies provide charge compensation for the trace amounts of trivalent transition-metal-ion impurities that are inadvertently present.…”

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confidence: 82%

Photoinduced electron paramagnetic resonance study of electron traps in TiO2 crystals: Oxygen vacancies and Ti3+ ions

Yang

Halliburton

Manivannan

et al. 2009

Applied Physics Letters

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“…Conversely, under reducing conditions, one expects V O and Ti i to have the lowest formation energies [224,225]. Electron paramagnetic resonance spectroscopy (EPR) studies report on the presence of V O [167,[226][227][228] as well as Ti i [229,230]. However, the assignment of a certain EPR signature to Ti i has been disputed [231], and hence it is still under debate if Ti i is present in typical r-TiO 2 samples.…”

Section: Defects In Rutile Titanium Dioxidementioning

confidence: 99%

Ti- and Fe-related charge transition levels in β−Ga2O3

Zimmermann

Frodason

Barnard

et al. 2020

Applied Physics Letters

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This thesis would not have been possible without the support of many people, and I am eternally grateful for all the support. I hope to see some of you again in the future! The main objective of my PhD project was to study defects in semiconducting oxides within the research project FOXHOUND headed by Prof. Lasse Vines, my main supervisor. I am grateful to Lasse for the opportunity to work on this topic. I have learned much more than I imagined I would when I started. Lasse, you have been a patient and competent supervisor who always took time to answer endless streams of questions. Prof. Truls Norby and Assoc. Prof. Anette Eleonora Gunnaes were co-advisors for my PhD project. I am grateful to Truls for introducing me to the chemist's view on defects and his group FASE/ELCHEM. I am truly sad that I did not get to collaborate more with Anette. I also want to thank Prof. Eduard Monakhov and the late Prof. Bengt Gunnar Svensson. Both were valuable unofficial advisers on my PhD, and helped moving my work along. Most of my work was carried out within the semiconductor physics group at the University of Oslo (LENS), and I would like to thank of all its current and former members for contributing to my work in many ways. There are some people who deserve special thanks. First of all, I am grateful to my long-term office mates Torunn, Sigbjørn and Josef for sharing many conversations and being there for each other. Secondly, I am particularly grateful to all my close collaborators at LENS, and especially Julie, Philip, Ymir, Vegard R., Vegard O., Viktor and Espen. I also want to thank our engineers (Micke, Halvor, Christoph and Viktor) and administrative staff (Marit, Heine and Kristin) for keeping things running! Also, thanks to Ilia, Robert, Vegard R. and Jon for taking care of the needs of the E-Lab and the Online-Setup. I was a co-supervisor for two master students: Vegard R. and Espen. I hope both of them learned something from me, because I did definitely learn from them. I am particularly grateful to Vegard R. for being a large part in building the steady-state photo-capacitance setup used in this work. I also would like to thank all my co-authors from outside of Oslo: Frank from Dresden, Willem, Walter and Danie from Pretoria, Klaus and Zbigniew from Berlin, Antti from Aalto and Joel from California. Special thanks to Willem, Walter and Danie for hosting me in Pretoria and showing me around. Last but not least, I would like to thank my family and my friends for their support!

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Defects in Rutile. I. Electron Paramagnetic Resonance of Interstitially Dopedn-Type Rutile

Cited by 61 publications

References 21 publications

Characterization of TiO2 Nanoparticles in Langmuir-Blodgett Films

Characterization of TiO2 Nanoparticles in Langmuir-Blodgett Films

Photoinduced electron paramagnetic resonance study of electron traps in TiO2 crystals: Oxygen vacancies and Ti3+ ions

Ti- and Fe-related charge transition levels in β−Ga2O3

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