2014, XVIII, 143 p. 90 illus., 36 illus. in color.
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Nominated as an outstanding Ph.D. thesis by KU Leuven, Belgium
Numerous examples show how first-principles modelling can be used to support experiments
Contains a complete and self-contained chapter on Density Functional Theory and Density Functional Perturbation Theory
Provides step-by-step guide to calculating vibrational properties of novel materials and their correlation with various experimental spectroscopic techniques
Includes an overview, novel results and prospects for silicene
Ge and III–V compounds, semiconductors with high carrier mobilities, are candidates to replace Si as the channel in MOS devices. 2D materials – like graphene and MoS_2 – are also envisioned to replace Si in the future.
This thesis is devoted to the first-principles modeling of the vibrational properties of these novel channel materials.
The first part of the thesis focuses on the vibrational properties of various oxides on Ge, making it possible to identify the vibrational signature of specific defects which could hamper the proper functioning of MOSFETs.
The second part of the thesis reports on the electronic and vibrational properties of novel 2D materials like silicene and germanene, the Si and Ge 2D counterparts of graphene. The interaction of these 2D materials with metallic and non-metallic substrates is investigated. It was predicted, for the first time, and later experimentally confirmed, that silicene could be grown on a non-metallic template like MoS_2, a breakthrough that could open the door to the possible use of silicene in future nanoelectronic devices.
Content Level »Research
Keywords »Defective Oxides - Density Functional Perturbation Theory - First-principles Modelling of Vibrational Properties - Inelastic Electron Tunneling Spectroscopy - Molybdenum Disulphide - Nanoelectronic Devices - Properties of Silicenene and Germanene - Si and Ge 2D Counterparts of Graphene - Silicene as New Channel Material - Vibrational Properties of 2D-materials