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A SEMINAR ON SEMICONDUCTOR

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Introduction

Semiconductors are materials whose electrical properties lie between Conductors and Insulators.
Ex : Silicon and Germanium

What are P-type and N-type ?

Semiconductors are classified in to P-type and N-type semiconductor
P-type: A P-type material is one in which holes are majority carriers i.e. they are positively charged materials (++)
N-type: A N-type material is one in which electrons are majority charge carriers i.e. they are negatively charged materials (-----)

Diodes

Electronic devices created by bringing together a p-type and n-type region within the same semiconductor lattice. Used for rectifiers, LED etc

Forward Bias and Reverse Bias

Forward Bias : Connect positive of the Diode to positive of supply…negative of Diode to negative of supply
Reverse Bias: Connect positive of the Diode to negative of supply…negative of diode to positive of supply.

Characteristics of Diode

Diode always conducts in one direction.
Diodes always conduct current when “Forward Biased” ( Zero resistance)
Diodes do not conduct when Reverse Biased
(Infinite resistance)