I am getting very low electrical conductivity of my semiconductor sample but i am not sure whether it is due to the low density or the material itself.
Without knowing the semiconductor material it is very difficult to answer
Are you talking about compaction density? As in from a powder form to pellets with some kind of press/sintering process?
Varying of carrier density (n) will affect the mobility of semiconductor, thus change the material conductivity (sigma).
The detailed relationship between sigma and n depends on your material e.g. Si, GaAs or graphene. It also depends on external condition, such as temperature.
Yes I am talking about the compact density @Abhilash Sugunan
Thanks Yue Liu for your suggestions.
I am working on copper bismuth sulfide to see the thermoelectric properties.
There is a minimum compaction density to get bulk conductivity. Less than that would result in conductivity that is dependant on the compaction density. Anyhow there paramters will also depend on grain size, sintering temperature, time, pressure etc. There are also other methods for compaction, for e.g. spark plasma sintering.
if the density of semiconductor is high, it mainly effect on current. collision and recombination increase in the semiconductor and they reduce the current
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