The electrons become less tightly bound and this leads

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Unformatted text preview: hat the bandwidth increases as the band index increases. The electrons become less tightly bound, and this leads to the subsequent increase in the band width. As the barrier width decreases, there is a complex behavior. In general, for large barrier widths, the bandwidth decreases as this width is reduced. But, there is a minimum beyond which the width begins to increase once again. We see that this minimum moves to lower barrier widths as the band index increases. Unless we know which band is of importance, it is hard to suggest how the width will vary with temperature in this model. Hence, the Kronig- Penney model is a nice mathematical tool, and gives us insight into how bands are formed. But, it is too simplistic to be able to draw any deep insight from it....
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This document was uploaded on 02/19/2014.

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