Classification Of Metals , Conductors And Semiconductors
Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits |
Sub Topic Code : 101_12_14_02_02 |
Topic Name : Classification Of Metals , Conductors And Semiconductors |
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Sub Topic Name : On The Basis Of Energy Band |
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Introduction
The theory of electron energy levels in solids is an application of the principles of quantum mechanics.
Pre-Requisites:
Energy Band
Activity:
The band gap energy of semiconductors tends to decrease with increasing temperature.
Real Life Question:
What are energy bands in semi-conductor materials?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Energy bands | Energy bands consisting of a large number of closely spaced energy levels exist in crystalline materials. The bands can be thought of as the collection of the individual energy levels of electrons surrounding each atom. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Solar cell | It is an electrical device that converts the energy of light directly into electricity by the photovoltaic effect. |
Real life uses :
Laser diodes and solar cells.
Places to visit :
Solar cell.
Practical examples around us
| Examples | Explainations |
|---|---|
| Solar cell | Electrical device that converts the energy of light directly into electricity by the photovoltaic effect. |
What you learn in Theory:
The theory of electron energy levels in solids is an application of the principles of quantum mechanics.
What you learn in Practice:
Electrons can gain enough energy to jump to the conduction band by absorbing either a phonon (heat) or a photon (light).