Electronic Devices and Semiconductor Manufacturing Commons^™

A Silicon Germanium Cmos Linear Voltage Regulator For Wireless Agricultural Applications, Aminta Naidili Castillo Robles

Graduate Theses and Dissertations

This thesis presents the design, simulation and test results of a silicon germanium (SiGe) complementary metal-oxide-semiconductor (CMOS) linear regulator. The objective of the circuit is to power other analog devices regardless of the load current and input voltage changes. The application of this regulator is to be part of a project developing a miniaturized semiconductor platform that can be inserted into stems of crops in order to measure data inside the plant and then send it wirelessly to the user. The linear regulator was designed on a BiCMOS SiGe 0.13µm which is a GlobalFoundries process. It has been tested at …

Model Development And Assessment Of The Gate Network In A High-Performance Sic Power Module, William Austin Curbow

Graduate Theses and Dissertations

The main objective of this effort is to determine points of weakness in the gate network of a high-performance SiC power module and to offer remedies to these issues to increase the overall performance, robustness, and reliability of the technology. In order to accomplish this goal, a highly accurate model of the gate network is developed through three methods of parameter extraction: calculation, simulation, and measurement. A SPICE model of the gate network is developed to analyze four electrical issues in a high-speed, SiC-based power module including the necessary internal gate resistance for damping under-voltage and over-voltage transients, the disparity …

Investigation Of Critical Technologies Of Chemical Vapor Deposition For Advanced (Si)Gesn Materials, Joshua Matthew Grant

Graduate Theses and Dissertations

The development of new materials for efficient optoelectronic devices from Group IV elements is the heart of Group IV photonics. This has direct ties to modern technology as the foundation for the electronics industry is silicon. This has driven the development of silicon-based optoelectronics using these other Group IV materials as silicon is a poor optical material due to its indirect band gap when compared to the III-V semiconductors that are used by most of the optoelectronics industry. While efforts have been made to integrate III-V materials onto silicon substrates, the incompatibility with the complementary metal oxide semiconductor process has …

Electrophysical Properties Of Multilayered Photo-Sensitive Structures With Barriers Of Metal-Semiconductor, Abdulaziz V. Karimov, Dilbara M. Yodgorova, Feruza A. Giyasova, Oybek A. Abdulkhaev

Euroasian Journal of Semiconductors Science and Engineering

The results of studies aimed at creating photodiode structures with a spectral range of 0.85÷0.9 µm and 1.31÷1.55 µm with an area of 3x4 mm2, which are obtained by successive vacuum deposition of cadmium sulfide and indium phosphide layers on a doped gallium arsenide substrate doped with oxygen with a specific resistance of 1∙107 Ohm∙sm. A distinctive feature of the obtained Au-vGaAs photodiode: O-nCdS-nInP-Au structures is the two-sided sensitivity and the presence of the amplification effect of the primary photocurrent (especially in the impurity region of the spectrum) and low dark current values (of the order of 10 nA) at …

Stabilizing Action Of Sodium Citrate When Receiving Silver Nanoparticles By The Method Of Chemical Restoration, Komil M. Mukimov, Shamil M. Sharipov, Tal’At S. Asilov, Asliddin Kh. Bakhriddinov

Euroasian Journal of Semiconductors Science and Engineering

The results of the synthesis of colloidal silver nanoparticles by the method of chemical reduction by ascorbic acid in the presence of sodium citrate are presented. The use of ascorbic acid as a reducing agent allows the synthesis of nanoparticles at room temperature. This makes it possible to study the mechanisms of the stabilizing effect of sodium citrate in the process of obtaining nanoparticles.

Influence Of Ultrasonic Waves On The Photoelectric And Spectral Characteristics Of Si-Photodetectors, Abdumalik G. Gaibov, Kutbiddin I. Vakhobov

Euroasian Journal of Semiconductors Science and Engineering

The paper considers the influence of ultrasonic fields on the photoelectric and spectral characteristics of diffusion Si-receivers of electromagnetic radiation. It was found that ultrasonic irradiation increases the lifetime, diffusion length of carriers and, as a consequence, increases the efficiency of collecting carriers on the electrical contacts of Si-receivers. As a result of these processes, an increase in the value of the short-circuit current is observed, which causes an increase in the open circuit voltage and the efficiency of such a diffusion Si-structure operating in the photo reformation mode.

Cascode Injection-Voltaic Transistor Fiber/Polymer Composite, Ziyoda Kh. Aripova, Shunkorjon T. Toshmatov

Euroasian Journal of Semiconductors Science and Engineering

This paper developed injection-voltaic transistor presents. The results research of the V-I characteristic of cascode injection-voltaic transistor. It is shown that the proposed transistor operates stably at values of the reverse voltage collector-base 2-3 times higher than single transistors.

Features Of Diffusion In Epitaxial Cosi2 Films Grown On The Surface Of Fluorete Of Deep Levels In Silicon Doped By Tungsten, Bakhrom E. Egamberdiev, Shokhruh A. Sayfulloev

Euroasian Journal of Semiconductors Science and Engineering

The paper presents the results of the analysis of the epitaxial film CoSi2/Si/CaF2(100) grown by molecular beam epitaxy. It is proved that under certain conditions of heat treatment, so-called epitaxial silicides are formed on the crystal structure, which can play the role of conductive layers or metal coatings. The data obtained allow us to draw conclusions about the morphology of the film and the nature of diffusion in the CoSi2 layer.

Upgrading Photo - Thermal Battery For Increasing Efficiency In Use Hot Climate, Ramizulla A. Muminov, Mukhammad N. Tursunov, Khabibullo X. Sabirov, Sanjar K. Shokuchkorov

Euroasian Journal of Semiconductors Science and Engineering

The experimental results of the modernization of photo – thermal battery of the new design of increased efficiency with thermal contact of the collector with the back surface of the photovoltaic battery (PhB) are presented. It is shown that the use of materials with a large reflection coefficient in the lateral plane of reflection, increasing accuracy of the operational guidance node on the Sun reducing the capacity of the heat collector provides an increase in power and uniformity of the temperature of the real surface of the PhB, which allows to increase the efficiency of the device.

The Method Of Sealing Of Temperature Sensors With Nickel Nanoclusters, Saifillo S. Nasriddinov, Shoira P. Usmanova, Shukhrat A. Ismoilov

Euroasian Journal of Semiconductors Science and Engineering

A method of sealing of temperature sensors to protect them from external factors is presented. The properties of the compound are also considered: high mechanical strength, water resistance, low moisture permeability, heat resistance, ozone resistance, high electrical strength.

High-Resolution Dynamic Strain Sensor Using A Polarization-Maintaining Fiber Bragg Grating, Dipen Barot, Gang Wang, Lingze Duan

PRC-Affiliated Research

Dynamic strain sensing based on fiber Bragg gratings (FBG) has found a wide range of applications in structural health monitoring and industrial process control. Conventional approaches to enhance strain resolution upon the standard configuration have shown challenges in scaling up due to much increased system complexity. In this report, we demonstrate a new scheme based on an FBG sensor fabricated in a polarization-maintaining fiber. By using balanced detection to suppress laser intensity noise and enhance strain signal, we have demonstrated an improvement of 28 dB in signal level, 18 dB in signal-to-noise ratio, and 20× in strain resolution when compared …

High-Resolution Dynamic Strain Sensor Using A Polarization-Maintaining Fiber Bragg Grating, Dipen Barot, Gang Wang, Lingze Duan

PRC-Affiliated Research

Dynamic strain sensing based on fiber Bragg gratings (FBG) has found a wide range of applications in structural health monitoring and industrial process control. Conventional approaches to enhance strain resolution upon the standard configuration have shown challenges in scaling up due to much increased system complexity. In this report, we demonstrate a new scheme based on an FBG sensor fabricated in a polarization-maintaining fiber. By using balanced detection to suppress laser intensity noise and enhance strain signal, we have demonstrated an improvement of 28 dB in signal level, 18 dB in signal-to-noise ratio, and 20× in strain resolution when compared …

High-Resolution Dynamic Strain Sensor Using A Polarization-Maintaining Fiber Bragg Grating, Dipen Barot, Gang Wang, Lingze Duan

PRC-Affiliated Research

Dynamic strain sensing based on fiber Bragg gratings (FBG) has found a wide range of applications in structural health monitoring and industrial process control. Conventional approaches to enhance strain resolution upon the standard configuration have shown challenges in scaling up due to much increased system complexity. In this report, we demonstrate a new scheme based on an FBG sensor fabricated in a polarization-maintaining fiber. By using balanced detection to suppress laser intensity noise and enhance strain signal, we have demonstrated an improvement of 28 dB in signal level, 18 dB in signal-to-noise ratio, and 20× in strain resolution when compared …

Experimental Study And Modeling Of The Gm-I Dependence Of Long-Channel Mosfets, Michael Fong Cheng

Master's Theses

This thesis describes an experimental study and modeling of the current-transconductance dependence of the ALD1106, ALD1107, and CD4007 arrays. The study tests the hypothesis that the I-gm dependence of these 7.8 µm to 10 µm MOSFETs conforms to the Advanced Compact Model (ACM). Results from performed measurements, however, do not support this expectation. Despite the relatively large length, both ALD1106 and ALD1107 show sufficiently pronounced ‘short-channel’ effects to render the ACM inadequate. As a byproduct of this effort, we confirmed the modified ACM equation. With an m factor of approximately 0.6, it captures the I-gm dependence with sub-28% maximum error …

Electromagnon Excitation In Cupric Oxide Measured By Fabry-Pérot Enhanced Terahertz Mueller Matrix Ellipsometry, Sean Knight, Dharmalingam Prabhakaran, Christian Binek, Mathias Schubert

Christian Binek Publications

Here we present the use of Fabry-Pérot enhanced terahertz (THz) Mueller matrix ellipsometry to measure an electromagnon excitation in monoclinic cupric oxide (CuO). As a magnetically induced ferroelectric multiferroic, CuO exhibits coupling between electric and magnetic order. This gives rise to special quasiparticle excitations at THz frequencies called electromagnons. In order to measure the electromagnons in CuO, we exploit single-crystal CuO as a THz Fabry-Pérot cavity to resonantly enhance the excitation’s signature. This enhancement technique enables the complex index of refraction to be extracted. We observe a peak in the absorption coefficient near 0.705 THz and 215 K, which corresponds …

Fabrication And Characterization Of Planar-Structure Perovskite Solar Cells, Guoduan Liu

Theses and Dissertations--Electrical and Computer Engineering

Currently organic-inorganic hybrid perovskite solar cells (PSCs) is one kind of promising photovoltaic technology due to low production cost, easy fabrication method and high power conversion efficiency.

Charge transport layers are found to be critical for device performance and stability. A traditional electron transport layer (ETL), such as TiO₂ (Titanium dioxide), is not very efficient for charge extraction at the interface. Compared with TiO₂, SnO₂ (Tin (IV) Oxide) possesses several advantages such as higher mobility and better energy level alignment. In addition, PSCs with planar structure can be processed at lower temperature compared to PSCs with …

Optical And Electrical Analysis Of Zno/Znte Micropillar Solar Cells, Sadia Binte Sohid

Master’s Theses

The prime focus of the energy-research community in recent times has been replacing fossil fuels with renewable energy. Therefore, photovoltaic research areas are rapidly expanding in this era. The purpose of this work is to compare three different structural ZnO/ZnTe solar cell types (planar, axial micropillar and radial micropillar). The best optical and electrical performance has been obtained by the radial junction (core-shell) ZnO/ZnTe micropillar solar cell due to its pillar structure and radial junction. The unique advantage of the radial junction micropillar is that the angle of the incident light and the carrier collection is orthogonal. Therefore, the pillar …

Straintronic Nanomagnetic Devices For Non-Boolean Computing, Md Ahsanul Abeed

Theses and Dissertations

Nanomagnetic devices have been projected as an alternative to transistor-based switching devices due to their non-volatility and potentially superior energy-efficiency. The energy efficiency is enhanced by the use of straintronics which involves the application of a voltage to a piezoelectric layer to generate a strain which is ultimately transferred to an elastically coupled magnetostrictive nanomaget, causing magnetization rotation. The low energy dissipation and non-volatility characteristics make straintronic nanomagnets very attractive for both Boolean and non-Boolean computing applications. There was relatively little research on straintronic switching in devices built with real nanomagnets that invariably have defects and imperfections, or their adaptation …

Aptamer Functionalized Zinc Oxide Field Effect Transistors For Odor Detection, Michael D. Aldridge

Graduate Theses, Dissertations, and Problem Reports (ETD)

Odor detection and identification are complex processes, and tasks that currently only animals do well. There is a pressing need for an electronic nose, or eNose, with good sensitivity, selectivity, and speed that mimics that ability. Food quality control operations, environmental sensing, occupational safety, and the defense sectors all require systems that can rapidly and reliably detect trace levels of volatile organic compounds. The goal of this work is to create a biologically inspired device which can accurately detect and identify odors at concentrations consistent with the most sensitive biological systems.

In order to mimic a natural olfactory system, we …

Fabrication And Characterization Of Nanofiber Nylon-6-Mwcnt As An Electrochemical Sensor For Sodium Ions Concentration Detection In Sweat, Kelsey Mills

Williams Honors College, Honors Research Projects

Fabrication and characterization nylon-6-MWCNT nanofiber as an electrochemical sensor to detect sodium ion concentrations specifically in sweat. Using contact angle to determine surface morphology and chronoamperometry testing to identify ideal sensor conditions, tests optimized parameters like weight percent of nylon or other polymers, carbon nanotube (CNT) isomer, and solution concentration to determine reproducibility of functional sensors. Utilizing the electric qualities of carbon nanotubes partnered with the sodium ion selectivity of calixarene treatment and polymers unique properties like flexibility and scalability create open an arena for optimizing sodium ion sensors for further development for functional prototypes. Morphology tests showed that the …