Temperature Dependence Cgs

Bakez said:

I have read in several texts the gate-source capacitance expressed in terms of Cox, W, and L.

However I am wondering what its temperature dependence could be? I assume that W and L do not change with temperature, so it must be Cox is the temperature dependent parameter, which I find written as:

εox/tox

So I assume that thickness does not change with temperature and it must be εox as the temperature dependent parameter. BUT then I read that with increasing temperature this dielectric property supposedly DECREASES with temperature, so Cgs sould also decrease? But I am sure it is the opposite

I thought these capacitances were supposed to have an exponential relationship with temperature (a professor once told me this)

So what is the deal?

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