Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 162 for “"Carrier mobility"”.
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Carrier mobility of downscaled amorphous semiconductors exemplified by hydrogenated amorphous silicon
… counterparts are used. The issue of low carrier mobility is one example, which needs to be solved in light of the increasing demands on the speed of IoT hardware. For a long time, endeavours on improving the carrier mobility of amorphous semiconductors have only targeted material- and …
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Quantum dynamics in condensed phases : charge carrier mobility, decoherence, and excitation energy transfer
… in condensed phases. First, we study charge-carrier mobilities in organic molecular crystals, and develop a microscopic theory that describes both the coherent band-like and incoherent hopping transport observed in organic crystals. We investigate the structures of polaron states using a …
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Numerical Modeling Analysis of Wafer Warpage and Carrier Mobility Change due to Tapered Through-Silicon-Via Geometry
… of the device performance by affecting the carrier mobility in transistors. This piezoresistivity effect can cause serious reliability concerns. The size of keep-out zone (KOZ), which is identified as a threshold of 5% carrier mobility change, was also quantified for various transistor types …
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Experimental investigation of carrier mobility degradation in metal oxide semiconductor field effect transistors of high permittivity gate dielectrics
… state density and consequently high mobility. However, mobility in transistors with high-κ gate dielectrics is generally lowered compared to their SiO2–based counterparts. Several factors are known to cause mobility degradation in SiO2-based MOSFETs. These include effect of charge …
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On the relationship between carrier mobility and velocity in sub-50 mm MOSFETs via calibrated Monte Carlo simulation
… parameters. The relationship between electron mobility and high-electric-field velocity at the source-channel potential energy barrier was investigated. The results show a strong correlation, as was demonstrated previously experimentally. Moreover, further proof is provided that the velocity at …
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Cu2O thin films for p-type metal oxide thin film transistors
… Cu2O TFTs are to overcome the low field-effect mobility and an unacceptably high off-state current that are a feature of devices that have been reported to date. This dissertation focuses on improving the carrier mobility, and identifying the main origins of the low field-effect mobility and …
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Amorphous hydrogenated boron carbide for solid-state direct-conversion thermal neutron detection
… We have investigated the effect of single-carrier transport and low charge carrier mobility, which are expected in a-BC:H films, on detection efficiency and spectral performance of a thin-film B4C detector using numerical Monte Carlo calculations. Experimentally, we have used …
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Effect of Moiety Choice on Structural and Electrical Properties in Organic Semiconductors
… with measurements of field-effect charge carrier mobility in order to evaluate the materials' relative electrical performance, followed by a variety of characterisation techniques of their photophysical properties in order to understand the reasons for differences observed in the first set …
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Placement for fast and reliable through-silicon-via (TSV) based 3D-IC layouts
… or issues, such as wirelength, stress-induced carrier mobility variation, temperature, and quality trade-offs, found in three-dimensional integrated circuits (3D ICs) that use through-silicon vias (TSVs) at placement stage. Four main works that support this goal are included. In the first work, …
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Design and optimization of colloidal quantum dot solids for enhanced charge transport and photovoltaics
… phenomena in CQD films is needed. While the carrier transport mechanisms between isolated molecules have been explored theoretically and the device-scale mobility of CQD layers has been characterized using experimental measurements such as time-of-flight analysis and field-effect-transistor …
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2D Electron Systems in Undoped GaAs and InGaAs and Progress Towards Undoped GaAs Nano-Structures
… 0D systems are formed by further confining the carrier gas. Undoped devices, which use an externally applied electric field to form a potential well for carriers, replicating the effect of dopants in a doped device, can have higher carrier mobilities and a lower charge impurity background than …
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Carrier momentum relaxation in highly doped polar semiconductors and semiconductor heterostructures
… It is important to thoroughly understand carrier transport in such structures. In doped polar semiconductors, collective excitations of the carriers (plasmons) and the atoms (polar phonons) couple. These coupled collective excitations affect the electrical conductivity, here quantified …
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Improved Organic Semiconductor Thin-Film Formation through the Addition of Vibrations to the Solution Shearing Method
In this thesis, methods for improving charge carrier mobility and deposition conditions for the solution shearing of organic semiconductors for organic field-effect transistors (OFETs) are investigated. Electrical performance for OFETs is currently still limited by the charge carrier mobility, …
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Electronic spin transport in bilayer and single layer graphene
… From the correlation between the charge carrier mobility and spin relaxation time, the major role of the D'yakonov-Perel' type of spin relaxation in bilayer graphene is discovered. And the Elliott-Yafet mechanism could dominate in single layer graphene. The first observation of long spin …
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Charge-carrier transport in amorphous organic semiconductors
… small bandwidth leads to localization of charge carriers and electron-hole pairs, called excitons. Thus, the charge-carrier mobility in organic semiconductors is generally much smaller than in their covalently-bonded, highly-ordered crystalline semiconductor counterparts. Indeed, one major …
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Highly conductive sodium dodecyl sulphate treated poly (3,4-ethylendioxylthiophene) : polystyrene sulfonate (pedot: pss) containing copper nanoparticles for flexible organic solar cells
… electron microscopy (SEM) and Raman. Charge carrier mobility was characterised using the Hall Effect Measurements. Conductivity measurements were done using a four-point probe coupled to a source meter. The conductivity of PEDOT: PSS films were significantly enhanced from 0.56 +0.19 S/cm to …
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Highly conductive sodium dodecyl sulphate treated poly (3,4-ethylendioxylthiophene) : polystyrene sulfonate (pedot: pss) containing copper nanoparticles for flexible organic solar cells
… electron microscopy (SEM) and Raman. Charge carrier mobility was characterised using the Hall Effect Measurements. Conductivity measurements were done using a four-point probe coupled to a source meter. The conductivity of PEDOT: PSS films were significantly enhanced from 0.56 +0.19 S/cm to …
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Fluorescence Enhancement Strategies for Polymer Semiconductors
… and processing routes which optimise the charge carrier mobility, whilst independently controlling the radiative and non-radiative processes. To date there has existed a seeming trade-off between charge carrier mobility and photoluminescence efficiency, which limits the development of some …
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Transport studies on CVD-grown graphene
… on a large-area sample at 4' K. We measure the carrier mobility of the sample and find it to be on the order of 1000 cm2/Vs, whereas monolayer graphene regularly exhibits much higher mobilities. We also examine what we find to be weak signatures of Shubnikov-de Haas oscillations in magnetic …
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Examining Thin Film AlSb for Room Temperature Gamma Detectors
… band gap (Eg = 1.6 eV), and theorized high dual carrier mobility. Simulations were performed using MCNP5 to predict energy deposited in AlSb by low energy gammas from Ba-133 and Co-57. A benchmark model was developed using a silicon surface barrier detector to validate AlSb simulations. Prior to …
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