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Junction Transistor
Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits
Sub Topic Code : 101_12_14_09_01
Topic Name : Junction Transistor
Sub Topic Name : Junction Transistor
Introduction

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.

Pre-Requisites:

Transistor

Activity:

Silicon (Si) is the most widely used material in semiconductor devices.

Real Life Question:

What are Junction transistors?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Junction transistors A bipolar junction transistor consists of three regions of doped semiconductors.
Learning aids / Gadgets
Gadgets How it can be used
microprocessors All transistor types can be used as the building blocks of logic gates, which are fundamental in the design of digital circuits. Transistors act as on-off switches; in the MOSFET, for instance, the voltage applied to the gate determines whether the switch is on or off.
Real life uses :

Building circuits.

Places to visit :

Digital circuits

Practical examples around us
Examples Explainations
Solar Cell Solar cells are typically illuminated with sunlight and are intended to convert the solar energy into electrical energy.
What you learn in Theory:

The first type of transistor to be mass-produced, is a combination of two junction diodes, and is formed of either a thin layer of p-type semiconductor sandwiched between two n-type semiconductors (an n-p-n transistor), or a thin layer of n-type semiconductor sandwiched between two p-type semiconductors (a p-n-p transistor).

What you learn in Practice:

Bipolar transistors can be made to conduct by exposure to light, since absorption of photons in the base region generates a photocurrent that acts as a base current; the collector current is approximately ? times the photocurrent.

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