Exercises 11.2: Pure (intrinsic) material

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11.2.1 The figure shows the temperature dependence of the intrinsic carrier concentration for three different semiconductors. Consider the red curve to be the reference sample. One of the other two has the same gap as the reference but the effective masses in the bands are different from those of the reference. The other has the same effective masses as the reference but a different gap.

A) Which color has the different effective masses?

B) What quantitative statement can you make about the effective masses in this sample relative to the reference?

C) What quantitative statement can you make about the energy gap in the other sample?