Global ETD Search
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Showing 1 to 18 of 18 for “"Hot carriers"”.
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Simulation of hot carriers in semiconductor devices
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Dynamics of plasmon-induced hot carriers in metallic nanoparticles
Plasmon-induced hot carriers have attracted lots of interests due to the extraordinary applications on hydrogen photocatalysis and solar energy harvesting. Although many great features of hot electrons have been studied through previous works, the generation process and dynamics of them are still …
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Temporal dynamics of hot-electrons in metal films and alloys
… it can either decay radiatively by emitting a photon or non-radiatively by transferring its energy to charge carriers with excessive kinetic energy, also known as the “hot-carriers.” The photogenerated hot-carriers are promising for applications ranging from optoelectronic devices to renewable …
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Plasmonic hot carrier-driven electrochemistry
… energy has sparked widespread interest in photocatalysts, including systems based on plasmonic metal nanoparticles. To take advantage of these materials, a fundamental understanding of how plasmon-induced hot-carriers drive chemical reactions is needed. This work examines how different hot …
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Hot-carrier reliability of MOSFETs at room and cryogenic temperature
Hot-carrier reliability is an increasingly important issue as the geometry scaling of MOSFET continues down to the sub-quarter micron regime. The power-supply voltage does not scale at the same rate as the device dimensions, and thus, the peak lateral E-field in the channel increases. Hot-carriers, …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… promising performance in applications including photovoltaics (PVs) and light-emitting diodes (LEDs) due to their excellent optoelectronic properties, such as high photoluminescence quantum yields (PLQYs), high carrier mobility, long diffusion lengths, low Urbach energies and tuneable bandgaps …
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Charge Carrier Relaxation in Halide Perovskite Semiconductors for Optoelectronic Applications
… device optimisation, little is known about the photophysical properties. For example, the nature of the bandgap is still debated and an indirect bandgap due to a Rashba splitting has been suggested. In this thesis, we study the early-time carrier relaxation and its impact on photoluminescence …
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Optical hot carrier solar cell: A general method of spectrum management in photovoltaics
… design and operating principles of the optical hot carrier solar cell (OHCSC) have been investigated in this thesis. An OHCSC integrates a hot carrier absorber and a conventional solar cell using a photonic structure called the optical contact, which enhances the carrier hot-luminescence …
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Terahertz oscillations of hot electrons in graphene
… uniform electric field is turned on in graphene, carriers accelerate ballistically until they are scattered by optic phonons and the process repeats itself. In this dissertation, I will show that the oscillatory nature of the motion of the carrier distribution function manifests in damped …
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Pressure profiles of plasmas confined in the field of a dipole magnet
… the electron cyclotron resonance (ECRH). These hot electrons are known to be gyrokinetically stabilized by the background plasma and can adopt pressure profiles steeper than the MHD limit. X-ray measurements indicated that this hot electron population could be described by an energy distribution …
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Simulating the modulation response of Vertical-Cavity Surface-Emitting lasers
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-23T19:47:36Z No. of bitstreams: 1 liu_yang.pdf: 1056599 bytes, checksum: 919cc5c334cfe8b016ad6c23a3dc7ad7 (MD5)
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Photodetection using ultrathin metal films
… is the most widely used material for visible photodetection, with extensive applications in both consumer and industrial products. Further, its excellent optoelectronic properties and natural abundance have made it nearly ideal for microelectronic devices and solar cells. However, silicon's …
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Enhancing light-matter interactions in oxide semiconductors
… layer or transport layer in many photovoltaic and photocatalytic devices, their relatively large optical band gap and limited tunability in intrinsic electronic properties remain to be overcome for more broad range of applications. Many efforts have focused on enhancing …
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Novel electronic behaviors in graphene nanostructures
… graphene, such as high mobility, Berry phase, photoresponse mediated by hot carriers, and at the same time acquire new features due to nanoscale heterogenities. In this thesis, I explore the novel electronic behaviors which emerge in this fashion. I focus on two types of systems: (i) …
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Patterned zero-dimensional nanostructures: fabrication and characterization
… multi-stack structures for use in laser and photodetector applications. Although nano-fabrication methods impose a degree of determinism on the quantum dot size, the lack of coupling between individual dots in an array structure coupled with the size variation is the primary cause for …
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Enhancement of the UV emission in metal nanoparticle-coated ZnO
… localised surface plasmons (LSP) into hot carriers and their radiative recombination following injection into the ZnO conduction and valence bands. The other describes the creation of an additional fast relaxation pathway via a dipole-dipole coupling mechanism between excitons in ZnO …
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Spin and Carrier Relaxation Dynamics in InAsP Ternary Alloys, the Spin-orbit-split Hole Bands in Ferromagnetic InMnSb and InMnAs, and Reflectrometry Measurements of Valent Doped Barium Titanate
This dissertation focuses on projects where optical techniques were employed to characterize novel materials, developing concepts toward next generation of devices. The materials that I studied included InAsP, InMnSb and InMnAs, and BT-BCN. I have employed several advanced time resolved and …
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Understanding and engineering molecular interactions and electronic transport at 2D materials interfaces
… flakes is produced, such that conventional photolithography is enabled for top-gate device fabrication. My present approach enables the only viable route at this time to produce AB stacked bi- and tri-layer graphene on arbitrary substrates on a large scale. Moreover, a comparative study that …