Abel Presley Gomes presented on semiconductor devices. The presentation introduced semiconductors and their properties, the two types of semiconductors - intrinsic and extrinsic. It described key semiconductor components like diodes, transistors and how they work. Transistors were invented in 1948 and consist of two back-to-back p-n junctions with an emitter, base and collector. The presentation highlighted advantages of semiconductors like their use in microcircuits, strength, longevity and switching abilities.

1. WELCOME
TO MY
PRESENTATION

2. PRESENTED BY
ABEL PRESLEY GOMES
ID : 162-33-3499

3. TOPIC
SEMICONDUCTOR
DEVICES

4. Introduction
Semiconductor:
A semiconductor is a substance , usually a solid chemical
element or compound , that can conduct electricity under
some conditions but not others, making it a good medium for
the control of electrical current.
Ex: P-N Junction, Diode, Transistors , IC's and etc.

5. Types of Semiconductors
There are two types of Semiconductors
1)Intrinsic Semiconductors
2)Extrinsic Semiconductors
Intrinsic Semiconductors : Si, Ge etc
Extrinsic Semiconductors: P-type and N-type

6. DIODE
Diode is device with two electrodes.
A P-N junction diode is a two terminal device made up of
semiconductor crystal.
P-N junction diode

7. Forward Bias
Resistance is very small
Reverse Bias
Resistance is very high
Conduction is due to thermal agitation

8. Transistors
Invented in 1948
A transistor is a semiconductor device used to amplify and
switch electronic signal.
Consist of two p-n junctions back to back
Has three regions:
1)Emitter
2)Base
3)Collector

9. P-N-P Transistor
Base is made up of P-type.
Current conduction is mainly due to holes.

10. N-P-N Transistor
Base is made up of p-type.
Current conduction is mainly due to electrons.

11. Advantages
Used in microcircuits.
1. They're quite strong & sturdy.
2. Usually, they've long life.
3. Switches turn on & off with the use of transistor.