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Title: Properties modification of chalcogenides by various external stimuli and the applications
Authors: Lu, Chao
Advisors: Arnod, Craig
Contributors: Mechanical and Aerospace Engineering Department
Keywords: Chalcogenides
Mass diffusion
Photonic crystals
Subjects: Physics
Materials Science
Issue Date: 2015
Publisher: Princeton, NJ : Princeton University
Abstract: The main theme of this dissertation is to explore the possible methods to achieve controllable and optimized modifications of the fundamental properties of chalcogenides. The first kind is about the structural modifications through light exposure. The shape changes of the thin film are created when exposed to light pattern. We then investigate the mechanisms of photo-induced surface relief formation. We derive a generalized model to explain the spatial and temporal evolution of photoinduced surface structure in photosensitive amorphous thin films. The model describes these films as an incompressible viscous fluid driven by a photoinduced pressure originating from dipole rearrangement. This derivation requires only the polarizability, viscosity and surface tension of the system. Using values of these physical parameters, the validity of the model is checked by fitting to experimental data of arsenic sulfide and demonstrating good agreement. Another way of modifications is achieved by the doping of silver nanoparticles. We achieve the in-situ and uniform generation of Ag nanoparticles in chalcogenide solution using laser ablation. Ag-doped chalcogenide films are fabricated by spin-coating the resulting solution. The prepared solution and films are analyzed using transmission electron microscopy, dynamic light scattering and UV-vis spectroscopy to investigate particle shape and size distributions. Uniform doping has been achieved. Besides, we are able to incorporate a variety of ions into chalcogenide glassy matrices using in-situ wet chemistry processing. Various chlorides are incorporated into chalcogenide matrices, leading to various property changes, such as absorption and refractive indices. In addition, we also explore modifications through photonic crystals. We use silicon photonic crystals with angstrom surface roughness to spatially confine the solution processed arsenic sulfide and achieve controllable modulations of chalcogenides emission. A planar emitter array of chalcogenides is fabricated based on this novel periodic hetero-structures of semiconductor.
Alternate format: The Mudd Manuscript Library retains one bound copy of each dissertation. Search for these copies in the library's main catalog
Type of Material: Academic dissertations (Ph.D.)
Language: en
Appears in Collections:Mechanical and Aerospace Engineering

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