Phonon engineering in nanodimensional structures
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StatusThe thesis was presented on the 20 May, 2016Approved by NCAA on the 5 July, 2016 Abstract – 5.94 Mb / in romanian – 5.89 Mb / in romanian |
Keywords
phonons, electrons, thermal transport, semiconductor nanostructures, nanofilm, nanowire, graphene, phonon engineering, continuum approach, crystal lattice dynamics.Summary
Scientific review of the habilitae doctor thesis in physics (based on published articles), Chisinau, 2016. Introduction, 4 Chapters, General conclusions and recommendations, 176 references, 91 pages, 25 figures, 2 tables. Based on the obtained results, 150 scientific works were published, including one monograph, two books chapters, 6 review papers and 33 research articles in ISI journals, 12 articles in national scientific journals and over 100 abstracts in proceedings/books of abstracts of international or national conferences.
Domain of study: physics of nanosystems.
Goal and objectives: theoretical development of phonon engineering concept for one- and two-dimensional multilayered semiconductor nanostructures and graphene for improvement of their electrical and thermal conductivities.
Scientific novelty and originality: the theoretically developed phonon engineering concept for multilayered semiconductor nanostructures and graphene is fundamentally new approach for improvement of thermal and electrical properties of nanostructures by a proper tuning of their phonon properties; the phonon states in considered nanostructures are investigated in detail, using different models of crystal lattice vibrations; the developed theory of heat transport allows interpretation of extremely high values of phonon thermal conductivity in graphene and its strong dependence on spatial dimensions of graphene flakes, concentration of crystal lattice defects and edge roughness.
Theoretical importance: accurate models of phonon transport in multilayered semiconductor nanostructures and graphene are developed; the peculiarities of phonon processes in such nanostructures are theoretically investigated and explained.
Practical significance of the obtained results is related to a possible improvement of operational parameters of modern nanostructure-based devices by proper tuning of their phonon properties.
Summary
- 1.1. Phonons and thermal transport in semiconductor nanostructures
- 1.2. Phonons and thermal transport in graphene materials
- 1.3. Conclusions to Chapter 1
2. PHONON ENGINEERING IN TWO-DIMENSIONAL SEMICONDUCTOR NANOSTRUCTURES
- 2.1. Engineering of phonon energy spectra and group velocities in two-dimensional semiconductor nanostructures
- 2.1.1. Continuum model for phonons in two-dimensional nanostructures
- 2.1.2. Dynamic models of lattice vibrations in two-dimensional nanostructures with diamond-like crystal lattice
- 2.2. Phonon engineered thermal conductivity in multilayered nanostructures with core Si layer
- 2.3. Phonon engineered enhancement of electron mobility in two-dimensional heterostructures with Si and GaN conduction channels
- 2.4. Conclusions to Chapter 2
3. PHONON ENGINEERING IN ONE-DIMENSIONAL SEMICONDUCTOR NANOSTRUCTURES
- 3.1.Engineering of phonon energy spectra and group velocities in GaN and Si nanowires with elastically dissimilar cladding layers
- 3.1.1. Continuum model for phonons in rectangular and cylindrical GaN-based nanowires
- 3.1.2. Dynamic models of lattice vibrations for nanowires with diamond-like crystal lattice
- 3.2. Phonon engineered thermal conductivity in Si-based nanowires.
- 3.3. Conclusions to Chapter 3
4. PHONON ENGINEERING IN GRAPHENE
- 4.1. Phonons in graphene
- 4.2. Lattice thermal conductivity in graphene
- 4.3. Lattice thermal conductivity in graphene ribbons
- 4.4. Conclusions to Chapter
Oficial Reviewers
- Anatolie Casian
doctor habilitat, professor - Igor Belousov
doctor habilitat, professor, Institute of Applied Physics of the - KHITUN Alexander
PhD, profesor, Universitatea din California – Riverside, SUA
Council's Members
- Petru Hadji, president
doctor habilitat, professor, Institute of Applied Physics of the - Vasile Tronciu, secretary
doctor habilitat, professor - Valeriu Canţer (decedat), member
doctor habilitat, professor, Institute of the Electronic Engineering and Nanotechnologies - Florentin Paladi, member
doctor habilitat, professor, Moldova State University - Mihail Macovei, member
doctor habilitat, associate professor (docent) - Alexandru Barsuc, member
doctor habilitat, professor - Albina Nikolaeva, member
doctor habilitat, professor, Institute of the Electronic Engineering and Nanotechnologies
Theses
