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 37 for “"I-V curves"”.
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Photovoltaic Emulator Adaptable to Irradiance, Temperature and Panel Specific I-V Curves
<p>This thesis analyzes the design and performance of a photovoltaic (PV) emulator. With increasing interest in renewable energies, large amounts of money and effort are being put into research and development for photovoltaic systems. The larger interest in PV systems has increased demand for …
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The optimization of SPICE modeling parameters utilizing the Taguchi methodology
… the fit between measured and simulated I-V curves for GaAs MESFETs. The Taguchi method consists of developing a Signal-to-Noise Ratio (SNR) equation that will find the optimum combination of controllable signal levels in a design or process to make it robust or as insensitive to noise as …
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Analysis of transport properties in a zaz graphene nanoribbon junction using various dopants
… and its transport properties were analyzed. I-V curves, calculated by nonequilibrium Greens function method combined with the density functional theory under external bias, showed varying semiconducting characteristics. Further, the width of the junction also showed significant effects in the …
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The Effects of Cesium Deposition and Gas Exposure on the Field Emission Properties of Single Wall and Multiwall Carbon Nanotubes
… deposition, the FE current versus voltage (I-V) curves showed non-Fowler-Nordheim behavior at large currents consistent with tunneling from adsorbate states. At lower currents, the ratio of the slope of the FE I-V curves before and after Cs deposition was approximately 2.1. Exposure to N2 does …
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A compact model for silicon controlled rectifiers in low voltage CMOS processes
… measurement data, such as quasi-static I-V curves and transient voltage overshoot, are discussed. These aspects include conductivity modulation of the well resistances in the SCR, impact ionization at the N-well/P-well junction, and the influence of electric fields in the well region on …
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Electrical properties of metal/wse2structures
… its current-voltage (I-V) characteristics. I-V curves for different metals on WSe2 are analyzed as function of temperature. Barrier height is determined from Au-nWSe2 Schottky barrier diode. This study provides a theoretical background for the selection of favourable metals on monolayer WSe_2.
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Towards Ion Channel Based Nanofluidic Devices: Simulations of Water and Electrolyte Transport in Nanotubes and Channels
… from classical continuum theory. I-V curves in a channel-bath system using ionic mobilities from molecular dynamics simulations were significantly different with and without considering the effect of quantum charges for channels widths less than 4 nm.
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Investigation of dye-sensitized solar cell performance with single chirality semiconducting carbon nanotubes
… in a DSSC. Characterization includes I-V curves (performed in dark and light), quantum efficiency, and impedance spectroscopy.
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Synthesis and electrical property measurements of individual layered transition metal dichalcogenide nanotubes and nanowires
… made, two point room temperature current voltage curves were recorded for MoS2, ReS2, and ReSe 2 nanotubes. The current voltage characteristics displayed I-V curves that were nearly linear, nearly symmetric, and nearly rectifying for these systems. The currents passed through these nanotubes …
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The synthesis and characterization of metal chalcogenide-pedot: pss polymer composites for thermal energy conversion
… measurements showed ohmic and linear I/V curves at room temperature for all films. The temperature dependent electrical conductivity for all systems was measured from 80 – 300 K and Mott’s VRH model was used to qualitatively determine the hopping mechanism. All systems are consistent with …
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Low Temperature Growth and Characterization of ZnO Nanostructures
… (XRD), absorption spectral analysis, and I-V curves via Contact Atomic Force Microscopy (CAFM).
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Analysis of the peak power of a photovoltaic array system under outdoor conditions at Vuwani Region of Limpopo Province
… to take the electrical current and voltage (I-V) curves of the photovoltaic array installed for normal mode as well as the disturbed mode .The peak power data of the PV system over a period of ten months of operation is recorded, analyzed and the results obtained are discussed. It is noted that …
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The assessment of the impact causuarina cunninghamiana miq. (river-she-oak) windbreak on macadamia trees orchards in Limpopo Province, South Africa
… to take the electrical current and voltage (I-V) curves of the photovoltaic array installed for normal mode as well as the disturbed mode .The peak power data of the PV system over a period of ten months of operation is recorded, analyzed and the results obtained are discussed. It is noted that …
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Properties and sensor performance of zinc oxide thin films
… on the microstructure. DC resistance, I-V curves and AC impedance were utilized to investigate the gas response of ZnO sensors. ZnO films prepared with high O2/Ar ratios showed better sensitivity to various gases, a feature believed to be related to their lower carrier density. Al doped ZnO …
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Synthesis of neuromorphic circuits with neuromodulatory properties
… behaviour through the shaping of its I-V curves in distinct timescales, thus characterising the behaviour of the neural circuit through its input-output properties. We show how modulation of the feedback loops affects the behaviour, and importantly, captures the transition between spiking …
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Examining Thin Film AlSb for Room Temperature Gamma Detectors
… and a high hole concentration (~ 1019 cm-3). I-V curves indicated a leaky nature for the diode, and it is suspected that Zener breakdown was occurring. During radiation experiments, no signal was observable above noise levels. The high hole concentration may have contributed to this result by …
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Polymer-derived Ceramics: Electronic Properties And Application
… SiCN ceramics was studied by measuring their I-V curves, temperature dependence of d.c.-conductivities and impendence. The results revealed that the SiCN ceramics exhibited typical amorphous semiconductor behavior, and their conductivity varied in a large range. The results also revealed that the …
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Parameter Estimation from Retarding Potential Analyzers in the Presence of Realistic Noise
… of instrument noise. Simulated noisy I-V curves representative of those expected from a mid-inclination low Earth orbit are fitted with standard curve fitting techniques to reveal the degree of uncertainty and inter-dependence between expected errors, with varying levels of additive noise. …
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Direct Measurements of the Effects of Cyclic Adenosine Monophosphate, and Related Compounds, on Membrane Conductances, Intracellular Calcium and Ph in Gastropod Neurons (cyclic-Amp)
… slope resistance (NSR) region of the I-V curves in these neurons. The internal pH routinely decreased in a reversible, dose-dependent manner following cyclic AMP injections, with the peak pH responses always occurring subsequent to the peak depolarizations. Addition of the …
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Microscopic physics of transition edge sensors
… parameters. To test my model, I calculate I(V) curves for device designs used by different research groups and compare them to experimental measurements. Using my model, I design a TES wafer for a systematic study of the effects of bilayer size and patterning on performance. To investigate the …
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