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Growth, Characterization And Simulation Of Tungsten Selenide Thin Films For Photovoltaic Applications, Qinglei Ma 2016 University of Nebraska-Lincoln

Growth, Characterization And Simulation Of Tungsten Selenide Thin Films For Photovoltaic Applications, Qinglei Ma

Theses and Dissertations from Electrical & Computer Engineering

An excellent candidate for an earth abundant absorber material is tungsten selenide (WSe2) which can be directly grown as a p-type semiconductor with a band gap value that matches well the solar spectrum. Although several fabrication methods were reported, further improvement is highly needed to make high quality WSe2 films. In addition, the numerical modelling of WSe2 solar devices is highly desired to assess the overall utility of the material. In this work, the growth and characterization of tungsten selenide thin films are investigated, as well simulations of homo- and hetero-junction devices. In the first part, the ...


Sensorless Rotor Position Estimation For Brushless Dc Motors, Iram G. Raza 2016 The University of Western Ontario

Sensorless Rotor Position Estimation For Brushless Dc Motors, Iram G. Raza

Electronic Thesis and Dissertation Repository

Brushless DC motor speed is controlled by synchronizing the stator coil current with rotor position in order to acquire an accurate alignment of stator rotating field with rotor permanent-magnet field for efficient transfer of energy. In order to accomplish this goal, a motor shaft is instantly tracked by using rotating rotor position sensors such as Hall effect sensors, optical encoders or resolvers etc. Adding sensors to detect rotor position affects the overall reliability and mechanical robustness of the system. Therefore, a whole new trend of replacing position sensors with sensorless rotor position estimation techniques have a promising demand.

Among the ...


Suss Microtec Ma6 Gen3 - S1818 Contrast Curve Data, Jonathan Bryan, Steven Wood, GERALD G. LOPEZ 2016 University of Pennsylvania

Suss Microtec Ma6 Gen3 - S1818 Contrast Curve Data, Jonathan Bryan, Steven Wood, Gerald G. Lopez

Protocols and Reports

No abstract provided.


Suss Microtec Ma6 Gen3 - S1813 Contrast Curve Data, Jonathan Bryan, Steven Wood, Gerald G. Lopez 2016 University of Pennsylvania

Suss Microtec Ma6 Gen3 - S1813 Contrast Curve Data, Jonathan Bryan, Steven Wood, Gerald G. Lopez

Protocols and Reports

No abstract provided.


Heidelberg Dwl66+ S1818 Contrast Curves, Steven Wood, GERALD G. LOPEZ 2016 University of Pennsylvania

Heidelberg Dwl66+ S1818 Contrast Curves, Steven Wood, Gerald G. Lopez

Protocols and Reports

Accurately gauge the optimal machine setting for MicroChem S1818 using the Heidelberg DWL 66+ and plot the contrast curves for the 2mm and 10mm writeheads.


Heidelberg Dwl66+ S1805 Contrast Curves, Steven Wood, Gerald G. Lopez 2016 University of Pennsylvania

Heidelberg Dwl66+ S1805 Contrast Curves, Steven Wood, Gerald G. Lopez

Protocols and Reports

Accurately gauge the optimal machine setting for MicroChem S1805 using the Heidelberg DWL 66+ and obtain contrast curves based on the 2mm and 10mm writehead.


Heidelberg Dwl66+ S1813 Contrast Curves, Steven Wood, GERALD G. LOPEZ 2016 University of Pennsylvania

Heidelberg Dwl66+ S1813 Contrast Curves, Steven Wood, Gerald G. Lopez

Protocols and Reports

Accurately gauge the optimal machine setting for MicroChem S1813 using the Heidelberg DWL 66+ and plot the contrast curves for the 2mm and 10mm writeheads.


Modelling Of The Nanowire Cds-Cdte Device Design For Enhanced Quantum Efficiency In Window-Absorber Type Solar Cells, Rasika Ganvir 2016 University of Kentucky

Modelling Of The Nanowire Cds-Cdte Device Design For Enhanced Quantum Efficiency In Window-Absorber Type Solar Cells, Rasika Ganvir

Theses and Dissertations--Electrical and Computer Engineering

Numerical simulations of current-voltage characteristics of nanowire CdS/CdTe solar cells are performed as a function of temperature using SCAPS-1D. This research compares the experimental current-voltage (I-V) characteristics with the numerical (I-V) simulations obtained from SCAPS-1D at various temperatures. Various device parameters were studied which can affect the efficiency of the nanowire-CdS/CdTe solar cell. It was observed that the present simulated model explains the important effects of these solar cell devices, such as the crossover and the rollover effect. It was shown that the removal of defect in i-SnO2 is responsible for producing the crossover effect. In the past ...


Beyond Conventional C-Plane Gan-Based Light Emitting Diodes: A Systematic Exploration Of Leds On Semi-Polar Orientations, Morteza Monavarian 2016 Virginia Commonwealth University

Beyond Conventional C-Plane Gan-Based Light Emitting Diodes: A Systematic Exploration Of Leds On Semi-Polar Orientations, Morteza Monavarian

Theses and Dissertations

Despite enormous efforts and investments, the efficiency of InGaN-based green and yellow-green light emitters remains relatively low, and that limits progress in developing full color display, laser diodes, and bright light sources for general lighting. The low efficiency of light emitting devices in the green-to-yellow spectral range, also known as the “Green Gap”, is considered a global concern in the LED industry. The polar c-plane orientation of GaN, which is the mainstay in the LED industry, suffers from polarization-induced separation of electrons and hole wavefunctions (also known as the “quantum confined Stark effect”) and low indium incorporation efficiency that ...


Optical Investigations Of Ingan Heterostructures And Gesn Nanocrystals For Photonic And Phononic Applications: Light Emitting Diodes And Phonon Cavities, Shopan d. Hafiz 2016 hafizsd

Optical Investigations Of Ingan Heterostructures And Gesn Nanocrystals For Photonic And Phononic Applications: Light Emitting Diodes And Phonon Cavities, Shopan D. Hafiz

Theses and Dissertations

InGaN heterostructures are at the core of blue light emitting diodes (LEDs) which are the basic building blocks for energy efficient and environment friendly modern white light generating sources. Through quantum confinement and electronic band structure tuning on the opposite end of the spectrum, Ge1−xSnx alloys have recently attracted significant interest due to its potential role as a silicon compatible infra-red (IR) optical material for photodetectors and LEDs owing to transition to direct bandgap with increasing Sn. This thesis is dedicated to establishing an understanding of the optical processes and carrier dynamics in InGaN heterostructures for ...


Hybrid Straintronics-Spintronics: Energy-Efficient Non-Volatile Devices For Boolean And Non-Boolean Computation, Ayan K. Biswas 2016 Virginia Commonwealth University

Hybrid Straintronics-Spintronics: Energy-Efficient Non-Volatile Devices For Boolean And Non-Boolean Computation, Ayan K. Biswas

Theses and Dissertations

Research in future generation computing is focused on reducing energy dissipation while maintaining the switching speed in a binary operation to continue the current trend of increasing transistor-density according to Moore’s law. Unlike charge-based CMOS technology, spin-based nanomagnetic technology, based on switching bistable magnetization of single domain shape-anisotropic nanomagnets, has the potential to achieve ultralow energy dissipation due to the fact that no charge motion is directly involved in switching. However, switching of magnetization has not been any less dissipative than switching transistors because most magnet switching schemes involve generating a current to produce a magnetic field, or spin ...


Mohat Tool To Illustrate Diode And Transistor Modes Of Operation Using Ltspice, Getu D. Engdaw 2015 California Polytechnic State University - San Luis Obispo

Mohat Tool To Illustrate Diode And Transistor Modes Of Operation Using Ltspice, Getu D. Engdaw

Electrical Engineering

This project develops a tool to identify the modes of operation of diodes and transistors in a circuit. The MoHAT tool receives schematics or circuit files generated from LTspice, and it determines the state of each diode and transistor. This tool illustrates diodes, BJT and MOS regions of operations using text or graphics accordingly. The tool also suggests necessary adjustments to switch from one mode of operation to another upon users request. Furthermore, the tool specifies if a transistor functions in amplification region. The MoHAT tool compares the nodal voltages of an element and determines the mode of operation.


Monitoring The Threat Of Sinkhole Formation Under A Portion Of Us 18 In Cerro Gordo County, Iowa Using Tdr Measurements, Kevin O'Connor, Matthew Trainum 2015 GeoTDR, Inc

Monitoring The Threat Of Sinkhole Formation Under A Portion Of Us 18 In Cerro Gordo County, Iowa Using Tdr Measurements, Kevin O'Connor, Matthew Trainum

Sinkhole Conference 2015

Sinkhole formation is a common occurrence in northeast Iowa, and U.S. 18 in Cerro Gordo County was constructed over an area where sinkhole formation had only been locally known. It had not been recorded or identified in the Iowa DNR database at the time. Since 2004, sinkholes have developed along the right of way. Geophysical surveys contributed very little in the identifying the cause. However a Soil Survey (drilling program) identified numerous voids within carbonate bedrock. The soil borings indicated that shale overlying the carbonate rock has been removed/eroded, and resulted in the development of a karst subsurface ...


Science Behind The Magnetic Field Therapy, D. Thombre,, Megha Thombre 2015 Selected Works

Science Behind The Magnetic Field Therapy, D. Thombre,, Megha Thombre

Innovative Research Publications IRP India

Magnetic therapy is the use of magnets to relieve pain in various areas of the body. It is the simplest, cheapest and entirely painless system of treatment with no side effects. In present article, discussion of fundamental aspect about the application of magnetic field (Natural and artificial) and how it apply to the human body with suggestions. Magnetic field is produce by magnet or electromagnetic generating devices are able to penetrate the human body because human body is magnetic hence magnetic field affect the functioning of human body. Suggestions are, High blood pressure person sleep with foots towards west and ...


Simulating Nanowires And Ultra-Thin Body Transistors Using Nemo5 On Nanohub.Org, Liang Yuan Dai, James E. Fonseca, Chu Yuan Chen, Gerhard Klimeck 2015 New Jersey Institute of Technology

Simulating Nanowires And Ultra-Thin Body Transistors Using Nemo5 On Nanohub.Org, Liang Yuan Dai, James E. Fonseca, Chu Yuan Chen, Gerhard Klimeck

The Summer Undergraduate Research Fellowship (SURF) Symposium

During the past twenty years, the most important aspects of semiconductor electronics have advanced into the nanometer range, resulting in exponential increases of microprocessor computing performance. As the size of electrical components continues to shrink, the cost of experimental research and industrial fabrication in this field has increased dramatically. Thus, the development of accurate nanoscale model simulations becomes necessary as a measure to decrease the high financial expenses of advancing semiconductor technology. This simulator supports atomistic modeling in order to provide an accurate description of the nanoscale devices, as current electrical components operate in the quantum regime and are affected ...


Synthesis And Characterization Of 2d Atomic Layers, Adam Charnas, Gang Qiu, Peide Ye 2015 Purdue University

Synthesis And Characterization Of 2d Atomic Layers, Adam Charnas, Gang Qiu, Peide Ye

The Summer Undergraduate Research Fellowship (SURF) Symposium

As electronic devices have continued to become smaller, a pressing need has developed for new technologies in order to surpass current size constraints. As such, 2-dimensional materials have become a topic of great interest in experimental device research. Monolayer black phosphorus, or phosphorene, is one such 2D material which shows significant potential as a p-type semiconductor. Phosphorene exhibits a number of unique and desirable electrical properties such as a layer-dependent band gap, high carrier mobility, and anisotropic conductivity. An investigation into optimal growth of black phosphorus, the precursor material to phosphorene, as well as characterization of phosphorene-based devices will be ...


Alternating Current Electrokinetics Based Capacitive Affinity Biosensor: A Point-Of-Care Diagnostic Platform, Haochen Cui 2015 University of Tennessee - Knoxville

Alternating Current Electrokinetics Based Capacitive Affinity Biosensor: A Point-Of-Care Diagnostic Platform, Haochen Cui

Doctoral Dissertations

Capacitive bioaffinity detection using microelectrodes is considered as a promising label-free method for point-of-care diagnosis, though with challenges in sensitivity, specificity and the time “from sample to result.” This work presents an alternating current (AC)-electrokinetic based capacitive affinity sensing method that is capable of realizing rapid in-situ detection of specific biomolecular interactions such as probe-analyte binding. The capacitive biosensor presented here employs elevated AC potentials at a fixed frequency for impedimetric interrogation of the microelectrodes. Such an AC signal is capable of inducing dielectrophoresis (DEP) and AC electrothermal (ACET) effects, so as to realize in-situ enrichment of macro and ...


Strain Controlled Ultra-Low-Energy Magnetic Tunneling Junction, Hasnain Ahmad, Supriyo Bandyopadhyay, Jayasimha Atulasimha 2015 Virginia Commonwealth University

Strain Controlled Ultra-Low-Energy Magnetic Tunneling Junction, Hasnain Ahmad, Supriyo Bandyopadhyay, Jayasimha Atulasimha

Supriyo Bandyopadhyay

We are experimenting on designing a voltage-controlled ultra-low-energy Magnetic Tunneling Junction (MTJ) device using a soft single domain magnetostrictive layer (i.e. Galfenol: Fe1-xGax , x = 20 At%) coupled to a piezoelectric layer (i.e. PMN-PT). Special metal pads have been designed using photolithography to generate stress in the PMN-PT layer by applying electric field. The patterns of different shape anisotropic nano-magnets are designed using e-beam lithography and we have successfully fabricate FeGa nanomagnets with only 12 to 13 nanometer thickness by sputter deposition. These nanomagnets have been characterized by magnetic force microscopy for observing their switching capabilities. Several nano-magnets have ...


Common Mode Voltage Mitigation Strategies Using Pwm In Neutral-Point-Clamped Multilevel Inverters, Chad Alexander Somogyi 2015 Marquette University

Common Mode Voltage Mitigation Strategies Using Pwm In Neutral-Point-Clamped Multilevel Inverters, Chad Alexander Somogyi

Master's Theses (2009 -)

Over the last several decades, there has been consistent growth in the research and development of multilevel voltage-source inverter-based adjustable speed motor drives (ASDs) as a result of low cost, high reliability power semiconductors. The three-level neutral-point-clamped (NPC) ASD is a popular multilevel inverter used in low and medium voltage applications because of its ability to produce lower levels of total harmonic distortion (THD) and withstand higher voltages while preserving the rated output power compared to two-level ASDs. As with other voltage-source inverters, three-level NPC ASDs produce common-mode voltage (CMV) that can cause motor shaft voltages, bearing currents, and excess ...


Optical Characterization Of Ingan Heterostructures For Blue Light Emitters And Vertical Cavity Lasers: Efficiency And Recombination Dynamics, Serdal Okur 2015 Serdal Okur

Optical Characterization Of Ingan Heterostructures For Blue Light Emitters And Vertical Cavity Lasers: Efficiency And Recombination Dynamics, Serdal Okur

Serdal Okur

OPTICAL CHARACTERIZATION OF INGAN HETEROSTRUCTURES FOR BLUE LIGHT EMITTERS AND VERTICAL CAVITY LASERS: EFFICIENCY AND RECOMBINATION DYNAMICS By Serdal Okur, Ph.D. A thesis submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at Virginia Commonwealth University. Virginia Commonwealth University, 2014. Major Director: Ümit Özgür, Associate Professor, Electrical and Computer Engineering This thesis explores radiative efficiencies and recombination dynamics in InGaN-based heterostructures and their applications as active regions in blue light emitters and particularly vertical cavities. The investigations focus on understanding the mechanism of efficiency loss at high injection as well as developing designs to ...


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