Posted by Steve Simon on May 25, 2013, 1:19 pm, in reply to "Band Gap of Silicon"
Direct and indirect band gaps! The conductivity (densities of carriers) doesn't care if the gap is direct or indirect, but optical absorbtion does. The weak 1.2 eV step is from the indirect gap, but then when you reach the direct band gap energy you get another very big step in absorbtion.
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