1. Semiconductor Devices Flashcards
The atoms consists of a central nucleus containing ________ charged protons, around which rotate a number of ________ charged electrons.
- POSITIVE
- NEGATIVE
Different elements have a number of different ______
Electrons
Germanium has a total of ______ electrons in 4 rings
32
Silicon has ____ electrons in 3 rings
14
The properties of an element are largely determined by the conditions existing in its outer ring of _____
Electrons
What is the name of the outer ring?
Valance ring
Materials having the valence electrons very loosely bound to the atom are good conductors of _____
Electricity
When copper is at room temperature what can happen to it?
Cause approximately one electron to become detached from each atom
Semiconductors are materials whose electrical conductivity lies between that of good conductors like copper and insulators like polythene. Typical examples are _______
Silicon and germanium
Today, most semiconductor chips and transistors are made with ______
Silicon
A ____ is the simplest possible semiconductor device
Diode
Silicone and germanium have a unique properly in their electrons structure.
Each has _____________ . This allows them to form nice crystals
Four electrons in its outer orbital
The four electrons form perfect covalent bonds with four neighbouring atoms, creating a ______
Lattice
To change the behaviour of silicon or germanium and turn them into a conductor a process called ______ must be carried out, in doping, you mix a small amount of an ______ into the silicon or germanium crystal.
- Doping
- Impurity
For pure silicon or germanium to become capable of carrying a current it must be ____ with an impurity
Doped
