Making semiconductor devices

physics.kku.ac.th

Making semiconductor devices

315 280 Electricity and Basic Electronics

Making semiconductor devices


315 280 Electricity and Basic Electronics

Raw silicon is multi-crystalline.

www.mineralgalleries.com


315 280 Electricity and Basic Electronics

When it is going to be

used to make diodes,

transistors and

integrated circuits (op.

Amps. etc.) it needs to

be made into a single

crystal.


315 280 Electricity and Basic Electronics

Silicon wafers stored

in a clean room.


315 280 Electricity and Basic Electronics

Doping with Arsenic gives an

extra electron

Doping with Gallium gives a

missing electron

http://www.mtmi.vu.lt/pfk/funkc_dariniai/sol_st_phys/impurities.htm


315 280 Electricity and Basic Electronics

The resistivity of silicon

changes with the amount of

doping. A large amount of

doping gives an increase in

the number of free electrons

or free holes, so the current

flows more easily, and the

resistance decreases.


315 280 Electricity and Basic Electronics

The lithographic process

http://www.macdiarmid.ac.nz/news/success/alkaisi.php


315 280 Electricity and Basic Electronics

In this machine, silicon

wafers are loaded into a

chamber to be etched with

acid.


315 280 Electricity and Basic Electronics

IC circuits have many

interconnections at different

levels. Here the red is the doped

silicon, onto of the silicon

substrate, and the yellow parts are

metal connections.

http://en.wikipedia.org/wiki/Integrated_circuit


315 280 Electricity and Basic Electronics

Many circuits are

made on a single

crystal slice, called

a wafer.


315 280 Electricity and Basic Electronics

This wafer cutter

cuts the wafer

into individual

integrated circuits

pieces.

http://www.fonondss.com/Files/Image/Blackstar_2008.JPG


315 280 Electricity and Basic Electronics

This piece of silicon

contains a complete

circuit, including diodes,

transistors, resistors,

capacitors and

connections.


315 280 Electricity and Basic Electronics

Contacts are made by using

heat and pressure to attach

wires to the silicon.


315 280 Electricity and Basic Electronics

Testing integrated

circuits before

packaging.

astro.umd.edu


315 280 Electricity and Basic Electronics

http://commons.wiki

media.org/wiki/Ima

ge:Integratedcircuit-open.jpg

http://www.electronetwork.org/education/ic/

http://members.tripod.com/~ComputerLab/chip.jpg

More magazines by this user
Similar magazines