Electronics : Diode (Part 1) - A Solid State Approach

Name: Electronics : Diode (Part 1) - A Solid State Approach
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Diode as a Solid State Device-know what is happening inside the diode-Very useful for 2nd year Electronics Engg students

Created bySumanta kumar Pal

Last updated 5/2020

English

What you'll learn

Understand the fundamentals of P-N Junction Semiconductor diode by adopting a Solid State approach.
Analysis of Diode under Forward Bias,its Energy Band Diagram,Carrier Concentration variation w.r.t distance,Electric Field picture
Mathematical expressions for Electric potential, Depletion Layer under Equilibrium.
Discussion on Quasi-Fermi level and Energy Band Diagram plot.
Carrier concentration as a Function of distance under applied forward bias.
Current Density as a function of distance under applied forward bias.
A common misunderstanding-Cut in voltage VS Built in voltage.
V-I Characteristics of Diode under different bias conditions.
Understand Diode function Generator & Diode Transfer-function Generator.
Diode properties under reverse biased condition.
Discussion on Breakdown phenomena-Avalanche Breakdown & Zener Breakdown.

Course content

7 sections • 34 lectures • 3h 13m total length

Basic Electrical elements3:55
Lets start from the basics.Learn the Basic electrical elements and then we will go to higher concepts.
Introduction to Diode & Characteristic comparison7:26
Introduce the diode as a nonlinear element that conducts current only in the forward direction, blocks reverse flow, and exhibits nonlinear voltage–current characteristics with a slope-based forward-region approximation.
Linear & Non-linear resistance analysis6:07
How can we come to the concept of Diode from the basic concept of resistance....its simple.
Different Diode & Resistor combination5:47
Different diode resistor combination to analyse any electrical circuit with ease.
Diode Function Generator9:52
Generate different piece-wise functions with the help of Diode,Resistors and voltage sources.

Set of approximations for equilibrium analysis3:18
Carrier concentration as a function of distance under equilibrium12:26
Carrier distribution as a function of distance gives us the basics of all the concepts related to diodes under equilibrium.So it is very important.
Electric field & Potential picture under equilibrium7:37
Explain electric field and potential distribution in depletion region at equilibrium, using space-charge concepts, slope of the field with respect to x, and depletion width inversely tied to doping concentration.

Value of Electric Potential7:26
Explain the value of electric potential at equilibrium, showing how diffusion and mobility balance to yield a stable potential and zero net gain in the system.
Value of Peak Electric field4:29
Determine the peak electric field by simplifying the governing equation, eliminating a variable, and relating the electric field to potential and area through the given relationships.
Value of Depletion length3:50
Analyze the depletion length in a diode, derive the depletion width x_d and related extents at equilibrium, and use plot-based values to understand the junction behavior.
Explanation with an example6:22
Examples always help to understand concepts better.
Some important facts4:16

Concept of Quasi-Fermi level7:29
Quasi-Fermi level concept is important to draw the energy band diagram of a diode under equilibrium and under biased conditions. That is why clarity regarding this concept is essential.
Energy Band Diagram plot7:43
Learn to draw an energy band diagram for a diode in equilibrium, showing the energy gap and neutral regions. Ensure a continuous line defines the electric field and band-edge alignment.

Set of approximations6:30
Explore a set of approximations for diode analysis, from equilibrium assumptions to small perturbation expansions, and contrast depletion and diffusion limits under non-equilibrium conditions.
The Electric Field picture5:38
Explore how the electric field picture of a biased junction reveals how the depletion layer shrinks or grows with applied bias, while the built-in potential contrasts with equilibrium.
Carrier concentration as a function of distance ,Lecture 110:28
This concept will finally lead us to the I-V Characteristic of a diode under forward bias. That is why is concepts is discussed in full detail in 3 lectures.
Carrier concentration as a function of distance ,Lecture 23:29
Carrier concentration as a function of distance ,Lecture 33:28
Explore how carrier concentration varies with distance in a diffusion-dominated region using the diffusion approximation, revealing exponential changes with distance and how linear scale representations reveal these trends.
Current Density as a function of distance ,Lecture 13:20
To draw the current density variation w.r.t distance,it requires the concept of Continuity Equation under steady state condition.Lets discuss it first.
Current Density as a function of distance ,Lecture 24:06
Current Density as a function of distance ,Lecture 33:56
Explore how current density varies with distance in solid-state diodes, deriving and memorizing the exponential relation that governs diode behavior.
Current Density as a function of distance ,Lecture 43:13
Explore how current density varies with distance in a diode by analyzing diffusion and drift mechanisms, carrier types, and the role of the electric field.
Plot of I-V Characteristic for Si Diode at 300K5:52
Another Expression for Diode Current8:19
Different expressions of Diode current will ultimately help us to clear the concepts and solve several numerical problems.
Cut in voltage VS Built in voltage2:30
Sometimes students confuse between these two voltages.Lets get the concept discussed again in detail.
Practical Diode current equation4:10
Energy Band Diagram under Forward Bias11:48

Introduction & Electric Field picture2:24
Introduce the electric field picture of a diode, showing how reverse bias influences charge distribution and equilibrium under an applied voltage V.
Carrier Concentration variation w.r.t. distance5:29
Reverse Saturation Current and Temperature2:34
Explore how the reverse saturation current in a diode depends on temperature through an exponential expression, and identify the dominant sensitivity governing this behavior.
Breakdown phenomena : Avalanche Breakdown3:41
Explore avalanche breakdown, outlining two mechanisms and two criteria, large depletion region and large applied voltage, to explain rapid current rise at the knee.
Breakdown phenomena : Zener Breakdown4:52
Explore Zener breakdown in diodes via tunneling across a narrow barrier, showing how high doping and a small energy gap enable electrons from valence to conduction bands, with temperature effects.

Requirements

Basic knowledge of science,High school mathematics
Fundamental ideas of current, voltage and electric field
Knowledge of Semiconductor Physics,Complete idea regarding Drift current,Diffusion current,Diffusion approximation and Injection level in Semiconductor
Knowledge of Semiconductor Continuity Equation,Fermi Level

Description

Learn the fundamentals of Diodes and take the first leap to the world of Electronics. This course is on Diode as a Solid State Device. In this course we will thoroughly learn what happens inside a Diode under various applied voltages. So lets have a highlight of the entire course quickly-

Understand the fundamentals of P-N Junction Semiconductor diode. In this lecture we will understand the Diode from Solid State approach, that is we will learn what actually happens inside the Diode under different circumstances.
Properties of P-N Junction Semiconductor diode (Concept of Energy Band Diagram, Depletion Width, Electric Field at the junction etc). Examples have also been included to further clarify the concepts.
Mathematical expressions for Electric potential, Depletion Layer under Equilibrium.
Discussion on Quasi-Fermi level and Energy Band Diagram plot.
Carrier concentration as a Function of distance under applied forward bias. Its mathematical expressions have also been derived.
Current Density as a function of distance under applied forward bias. Its mathematical expressions have also been derived.
A common misunderstanding- Cut in voltage VS Built in voltage.
V-I Characteristics of Diode under different bias conditions.
Understand Diode function Generator & Diode Transfer-function Generator.
Diode properties under reverse biased condition.
Discussion on Breakdown phenomena-Avalanche Breakdown & Zener Breakdown.

Who this course is for:

The course is for those who love electronics and love to explore the world of electronics

Electronics : Diode (Part 1) - A Solid State Approach

What you'll learn

Explore related topics

Course content

Introduction to the concept of Diode5 lectures • 33min

Solid State Approach to analyze the Diode3 lectures • 23min

Quantitative analysis of a Diode under equilibrium5 lectures • 26min

Energy Band Diagram of a P-N junction Diode under equilibrium2 lectures • 15min

Ideal current voltage Characteristic under applied Forward Bias14 lectures • 1hr 17min

Ideal current voltage Characteristic under applied Reverse Bias5 lectures • 19min

MCQs on Diode0

Requirements

Description

Who this course is for: