hi these links should answer your questions. Also this information should give you an idea.

----quote----
Substrate may also refer to:In electronics:
1.In wafer (electronics) and thin films, the material upon which semiconductor devices are fabricated (i.e. glass).
2.Printed circuit board (electronics), or the electrically insulating portion of a PCB structure

----quote----
information obtain from http://en.wikipedia.org/wiki/Substrate

You can read information on each type mentioned on these links
http://en.wikipedia.org/wiki/Wafer_%28electronics%29
http://en.wikipedia.org/wiki/Thin_film
http://en.wikipedia.org/wiki/Printed_circuit_board

I came across this link and i think this one will tell you what is substrates and also what material they are made from,

http://lookup.computerlanguage.com/host_app/search?cid=C000401&def=737562737472617465.htm

http://lookup.computerlanguage.com/host_app/search
Source(s):
http://en.wikipedia.org/wiki/Substrate

http://en.wikipedia.org/wiki/Wafer_%28electronics%29

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

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

http://lookup.computerlanguage.com/host_app/search?cid=C000401&def=7375...

http://lookup.computerlanguage.com/host_app/search

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