Agoston, Peter (2011)
Point defect and surface properties of In2O3 and SnO2: A comparative study by first-principles methods.
Technische Universität Darmstadt
Ph.D. Thesis, Primary publication
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Punktdefekteigenschaften von In2O3 und SnO2: Eine vergleichende Studie mit Hilfe von Elektronenstrukturrechnungen -
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(Point defect and surface properties of In2O3 and SnO2: A comparative study by first-principles methods)
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Point defect and surface properties of In2O3 and SnO2: A comparative study by first-principles methods | ||||
Language: | English | ||||
Referees: | Albe, Prof. Karsten ; von Seggern, Prof. Heinz | ||||
Date: | 4 November 2011 | ||||
Place of Publication: | Darmstadt | ||||
Date of oral examination: | 6 July 2011 | ||||
Abstract: | The first part of the dissertation deals with the thermodynamic stability of point defects in In2O3 and SnO2. This is done by first surveying possible defect geometries using density functional theory (DFT) total energy calculations in order to identify relevant structures. The formation energies of selected defects are then further refined by estimating their formation entropies as well as by using more sophisticated DFT approximations like hybrid-functionals. The second part deals with the kinetic properties of point defects. The migration barriers of a range of defects is calculated in various charge states in order to estimate the diffusion constants and equilibration temperatures. The third part finally turns to the surface properties of In2O3 and SnO2. First, the controversially discussed thermodynamic ground state properties of SnO2 surfaces are resolved and complemented. Then a detailed survey on the stability and structure of surfaces is conducted for In2O3 surfaces. The influence of water, strain, dopants and band bending are discussed and linked to experimental observations. Finally, the properties of bulk defects and surfaces are compared for the two materials. |
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URN: | urn:nbn:de:tuda-tuprints-27811 | ||||
Classification DDC: | 500 Science and mathematics > 500 Science 500 Science and mathematics > 530 Physics 500 Science and mathematics > 540 Chemistry |
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Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling | ||||
Date Deposited: | 04 Nov 2011 12:23 | ||||
Last Modified: | 25 Jan 2024 12:45 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/2781 | ||||
PPN: | 386245487 | ||||
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