Sökning: "AlGaAs"
Visar resultat 1 - 5 av 44 avhandlingar innehållade ordet AlGaAs.
1. InGaAs/AlGaAs Heterojunction Phototransistors for Optical Signal Processing Applications
Sammanfattning : This thesis deals with InGaAs/AlGaAs heterojunction phototransistors (HPTs) operating in the wavelength region where the GaAs substrate is transparent. Vertical integration of such a current amplifying detector with emitters or modulators will facilitate the fabrication of two dimensional arrays of components for parallel optical signal processing and transmission applications. LÄS MER
2. Linear and Nonlinear Transport in Quantum Nanostructures
Sammanfattning : In this thesis, electron transport in mesoscopic semiconductor nanostructures, in particular so-called electron billiards or quantum dots, is studied. The thesis can be divided into two areas: the linear response regime of transport, and the nonlinear response regime of transport. LÄS MER
3. Nanoelectronic Devices Based on Low-Dimensional Semiconductor Structures
Sammanfattning : The present thesis reports on results from the fabrication technology development and the corresponding electrical transport measurements of low-dimensional semiconductor structures. The focus of the work has been directed towards two parts: the ballistic transport in nanostructure devices at room temperature, and the development of a charge-sensing technique for quantum dots (QD) in nanowires. LÄS MER
4. Spectroscopic studies of doped GaAs/ AlGaAs quantum wells in the high carrier density regime
Sammanfattning : This thesis is mainly based on experimental and theoretical investigations of the electronic structures and optical properties of p-type doped GaAs/AlGaAs quantum wells using a combination of photoluminescence and magneto-optical spectroscopy in the presence of high magnetic fields.The effects of high hole densities up to 3. LÄS MER
5. Electrical and Optical Properties of AlGaAs/GaAs Aperiodic Superlattices and Resonant Tunneling Diodes. Theory, Design and Applications
Sammanfattning : The objective of the work presented in this thesis is to study quantum transport and optical properties of aperiodic superlattices and resonant tunneling diodes using III-V semiconductor heterostructures grown by molecular beam epitaxy. The study follows a procedure of theoretical modeling, computer-aided design and simulation, sample growth, and measurements. LÄS MER