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Optical and Electrochemical Properties of KTP-Type Crystals / von Adriana Bocchini ; [Erstgutachter: Prof. Dr. Wolf Gero Schmidt, Zweitgutachter: Prof. Dr. Simone Sanna]. Paderborn, 2023
Inhalt
Abstract
Zusammenfassung
Introduction
Potassium Titanyl Phosphate: An All-In-One Device
Crystallographic Properties
Non-Stoichiometric KTP
Well-Established in Optics, Promising in Electrochemistry
Gray Tracking in KTP Crystals
A Brief Introduction to a Very Functional Theory
The Hohenberg-Kohn Theorems and the Kohn-Sham Equations
Exchange and Correlation Energy within DFT
Overcoming the Band-Gap Problem
The Quasiparticle Picture and the GW Approximation
Describing Strongly Localized Shells: The Hubbard Correction
Self-consistent calculation of the Hubbard U
Hybrid Functionals: Larger Band Gaps and Localized States
Alkali-Ion Batteries
Setup
Theoretical Investigation of Electrochemical Properties
Electrochemical Properties of KTA
Computational Details
KTA Cathodes
Modeling of the Cathode Material
Potassium-Vacancy Diffusion
KTA Anodes
Models
Potassium-Ion Diffusion
Conclusion and Outlook
Optical Properties from First Principles
A Short Overview
The Independent-Particle Approximation
Towards Realistic Absorption Properties
Optical Absorption Properties of Oxygen Vacancies
Computational Details
Oxygen Vacancies in KTP: Charge States and Spin Configurations
Assessing an Unconventional Approach
Absorption Properties of Oxygen Vacancies
About the Possible Role in Gray Track Formation
Conclusions and Outlook
Gray Tracks in KTP: New Insights into a Dark Phenomenon
Computational Details
Introduction of a New Defect Model
Discussion and Outlook
Concluding Remarks
References
List of Publications
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