The document discusses semiconductor devices and their characteristics. It covers topics like energy bands in semiconductors, carrier concentration, drift and diffusion current, the Hall effect, and PN junction diodes. Specifically, it describes direct and indirect bandgap semiconductors, how carrier concentration is determined in intrinsic and extrinsic semiconductors, and how drift current occurs under an applied electric field while diffusion current moves charges from high to low concentration regions. It also explains the Hall effect where a voltage develops perpendicular to the current and magnetic field.
Semiconductors are materials which have a conductivity between conductors (generally metals) and nonconductors or insulators (such as most ceramics). Semiconductors can be pure elements, such as silicon or germanium, or compounds such as gallium arsenide or cadmium selenide
Semiconductors are materials which have a conductivity between conductors (generally metals) and nonconductors or insulators (such as most ceramics). Semiconductors can be pure elements, such as silicon or germanium, or compounds such as gallium arsenide or cadmium selenide
SEMICONDUCTOR DEVICES AND APPLICATIONS.
Introduction to P-N Junction Diode and V-I Characteristics
Half wave and Full wave rectifiers
Capacitor filters
Zener diode and its Characteristics
Zener Diode as Voltage regulator
Introduction to Semiconductor Devices.
In modern world no other technology permeates every nook and cranny of our existence as does electronics.
Application of electronics are : Televisions, radios, stereo equipment, computers, scanners, electronic control systems (in cars for example) etc.
Advancements of Semi conductors and Superconductorsadnanalvi051
explained what are semiconductors and superconductors and their uses. Also nowadays revolutions and advancements in semiconductors as superconductors. After reading these Slides one can easily understand about semiconductors and Superconductors, Nowadays our life is full of semiconductor usage.
Electronics and Communication Engineering is the Branch of Engineering. Electronics and Communication Engineering field requires an understanding of core areas including Engineering Graphics, Computer Programming,Electronics Devices and Circuits-I, Network Analysis, Signals and Systems, Communication Systems, Electromagnetics Engineering, Digital Signal Processing, Embedded Systems, Microprocessor and Computer Architecture. Ekeeda offers Online Mechanical Engineering Courses for all the Subjects as per the Syllabus. Visit : https://ekeeda.com/streamdetails/stream/Electronics-and-Communication-Engineering
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
2. UNIT-I Semiconductor Devices and Characteristics: Introduction to
semiconductor physics: Energy bands in semiconductor, Direct and
indirect band-gap semiconductors, Carrier concentration in
semiconductor, Drift and diffusion current, Hall effect, Mobility and
resistivity, Generation and recombination of carriers; P-N junction
Diode: Formation of P-N junction, Working of diode, I-V characteristics,
Small signal switching models, Avalanche breakdown, Operation and
characteristics of Zener diode, Schottky diode, Tunnel diodes, Varactor
diode, PIN diode.
UNIT II: Applications of Diodes: Diode circuits: Half wave, Full
wave and Bridge rectifiers, Filters, Voltage multiplier, Clipper circuits,
Clamper circuits, Voltage regulator circuit using Zener diode.
UNIT–III: Bipolar Junction Transistors: Introduction, Transistor
construction, Transistor operation, Transistor current components,
Transistor as an amplifier, Common base configuration, Common
emitter configuration, Common collector configuration, Limits of
operation, Transistor specifications.
SYLLABUS
3. UNIT–IV Field Effect Transistors: Junction Field Effect Transistor
(JFET) - Principle of operation, Volt ampere characteristics, Advantages of
JFET over BJT, Introduction to MOSFETs - depletion and enhancement
type MOSFETs, Operation and Volt-ampere characteristics.
UNIT–V BJT and FET Biasing: Need for biasing, Operating point, Load
line analysis, Bias stabilization techniques: Fixed bias, Collector to base
bias, Self-bias, Stabilization against variations in Ico, VBE and β for the
self bias circuit, Bias compensation techniques, Thermal runaway and
Thermal stability. FET Biasing: Biasing techniques: Fixed bias, Source
self-bias, Voltage divider bias.
Text Books
1. Electronic Devices and Circuits – J.Millman, C.C.Halkias, and
Satyabratha Jit Tata McGraw Hill, 2nd Ed., 2007.
2. Neamen, Donald A. Semiconductor physics and devices: basic
principles. New York, NY: McGraw-Hill„ 2012.
SYLLABUS
4. The goal of electronic materials is to generate and
control the flow of an electrical current.
Electronic materials include:
1. Conductors: have low resistance which allows
electrical current flow
2. Insulators: have high resistance which
suppresses electrical current flow
3. Semiconductors: can allow or suppress
electrical current flow
Electronic Materials
5.
6.
7. Conductors
Good conductors have low resistance so electrons flow
through them with ease.
Best element conductors include:
Copper, silver, gold, aluminum, & nickel
Alloys are also good conductors:
Brass & steel
Good conductors can also be liquid:
Salt water
8. Insulators
Insulators have a high resistance so current does not flow in
them.
Good insulators include:
Glass, ceramic, plastics, & wood
Most insulators are compounds of several elements.
The atoms are tightly bound to one another so electrons are
difficult to strip away for current flow.
9. Semiconductors are materials that essentially can be
conditioned to act as good conductors, or good insulators, or
any thing in between.
Common elements such as carbon, silicon, and germanium
are semiconductors.
Silicon is the best and most widely used semiconductor.
Semiconductors
10. The unique capability of
semiconductor atoms is
their ability to link together
to form a physical structure
called a crystal lattice.
The atoms link together
with one another sharing
their outer electrons.
These links are called
covalent bonds.
Crystal Lattice Structure
2D Crystal Lattice Structure
11. If the material is pure semiconductor material like silicon, the
crystal lattice structure forms an excellent insulator since all the
atoms are bound to one another and are not free for current
flow.
Good insulating semiconductor material is referred to as
intrinsic.
Since the outer valence electrons of each atom are tightly bound
together with one another, the electrons are difficult to dislodge
for current flow.
Silicon in this form is a great insulator.
Semiconductor material is often used as an insulator.
Semiconductors can be Insulators
12. To make the semiconductor conduct electricity, other atoms
called impurities must be added.
“Impurities” are different elements.
This process is called doping.
Doping
13. An impurity, or element
like arsenic, has 5
valence electrons.
Adding arsenic (doping)
will allow four of the
arsenic valence
electrons to bond with
the neighboring silicon
atoms.
The one electron left
over for each arsenic
atom becomes available
to conduct current flow.
Semiconductors can be Conductors
14. The silicon doped with extra electrons is called an “N
type” semiconductor.
“N” is for negative, which is the charge of an electron.
Silicon doped with material missing electrons that produce
locations called holes is called “P type” semiconductor.
“P” is for positive, which is the charge of a hole.
Types of Semiconductor
15.
16.
17. Carrier Concentration
Carrier Concentration (intrinsic)
Inside a semiconductor, electrons and holes are generated with thermal
energy. The electron and hole concentration remain constant as long as the
temperature remain constant.
At temperature TK , in an intrinsic semiconductor n = p = ni where ni is called
intrinsic concentration.
Also the product
19. Carrier Concentration (Extrinsic)
As in pair production n = p = ni,
Also the product
where ni is called intrinsic concentration.
Suppose ND and NA are concentration of donor atom in n-type
semiconductor and concentration of acceptor atom p-type
semiconductor respectively.
N-type
Since in N-type semiconductor, majority charge carriers are electrons. The
hole concentration 'p' in comparison to electron concentration 'n' may be
ignored. Also each donor atom contribute one electron to the crystal, the
electron concentration in n-type is approximately equal to concentration of
donor atoms,
i.e.,
Using equation no. 1
20. p-type
Since in p-type semiconductor, majority charge carriers are holes. The
electron concentration 'n' in comparison to hole concentration 'p' may be
ignored. Also each acceptor atom contribute one hole to the crystal, the hole
concentration in p-type is approximately equal to concentration of acceptor
atoms,
i.e.,
Using equation no. 1
21. Charged particles move or drift under the
influence of the applied field.
The resulting current is called drift current
drift current
22.
23.
24.
25. Diffusion:
Due to non-uniform carrier concentration in a semiconductor, the
charge carriers moves from a region of higher concentration to a
region of lower concentration. This process is known as diffusion of
charge carriers.
26. When a Magnetic field is applied perpendicular to a
current Carrying Conductor or Semiconductor,
Voltage is developed across the specimen in a
direction perpendicular to both the current and the
Magnetic field.
This phenomenon is called the Hall effect and
voltage so developed is called the Hall voltage.
Let us consider, a thin rectangular slab carrying
Current in the X-direction. If we place it in a Magnetic
field B which is in the y-direction.
Potential difference Vpq will develop between the
faces p and q which are perpendicular to the z-
direction.
Hall Effect
27.
28.
29.
30. VH be the Hall Voltage in equilibrium , the Hall Electric field is
given by