Suppose that the effective mass of the holes in a material is 4 times that of the electron.At what temperature would fermi level be shifted by 10% from the middle of the forbidden energy gap?
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The effective mass is a quantity that is used to simplify band structures by modeling the behavior of a free particle with that mass. ... For electrons or electron holes in a solid, the effective mass is usually stated in units of the rest mass of an electron, me (9.11×10−31 kg).For a free electron, the mass in the latter is just the electron mass. ... From this follows that the hole effective mass is often larger than the electron effective mass. The top of the valence band tends to be flatter due to the asymmetry of the situation: you are talking about the highest occupied states for electrons.
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