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semiconductor as thermometer

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praveen450

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Hi,

I have n type doped semiconductor with conductivity at different temperatures from 0 to 550K.Now suppose I want to use this semiconductor as a thermometer at room temperature around 50K i.e from 250K to 350K.How can I know whether this semiconductor works as thermometer around this specified temperature depending on this conductivity values?.
 

i) The best approach would be to run a SPICE simulation with the semiconductor parameters in the model file.

ii) If you already have it fabricated, then literally plug it like a variable resistance and check the output current.

iii) Given a the conductivity of the semiconductor and mobility etc..there are also simpler analytic model e.g. book by S.M.Sze on semiconductor devices has some closed form equations for temperature models.
 
So,the conductivity should vary linearly with mobility inorder to work as a thermometer?.
 

Not necessarily, as long as you can attach a suitable equation to it you should be fine. for e.g. if T=exp(-kρ) where ρ is the conductivity you should still be able to measure the temperature.
All you need is a functional mapping from your domain i.e. temperature which maps to its corresponding conductivity.
 

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