Physical Properties of Integrated circuits?

Question

Hi, I am a first year engineering student, and I need to know the physical properties ie melting point and electrical conductivity of integrated circuits with reference to their silicone microstructure.
I have browsed almost everywhere on the net and there is nothing on this topic, only how they are produced etc which I already know about.

Answer 1

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Integrated circuits are a composite device made of different materials, so have no single melting point, or indeed electrical conductivity.
It's silicon not silicone.
The electrical conductivity of bulk silicon depends on the doping.
The electrical conductivity of a semiconductor device depends on the design and depends on voltage etc., which is the whole point.

Answer 2

Hi the reason is now we use surface mounted devices the core temperatures are protected by the way of construction.
internally most integrated circuit circuits are so small and connections are no longer a solder joint but a weld. so it requires far higher temperatures to destroy them.
one method used to solder components to a circuit board are to stick the individual integrated circuits to a board and each connection is painted with solder paste then the whole circuit board is heated up on an electric hot plate as soon as the solder runs the heat is removed usually by removing the circuit board from the hot plate gently with tongs and leaving it too cool.
because today there is issues with lead in solder solder to day contains silver which requires a higher temperature to melt at. hence the higher temperature the device can stand.