MATS 3011 Lecture Notes - Electronvolt

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15 Jul 2014
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0 < eg < 4 ev --> semiconductors. Each band has a distribution of many states that are separated by small increments of energy ( so close that they look continuous) Matsci page 1 probability of occupation of a state in the band. Let"s consider a metal (half-filled) @ t = 0k band empty filled. Probability of occupation of the band in filled portion is 1 (it"s occupied) When you go above, it"s 0 (it"s empty) If you increase t, electrons can get excited and spill over into empty state (see red) At t = 0 k, probability of a state being occupied is 1. As t increases, some of the stuff (electrons, which get excited) spill over to higher energy states which were earlier unoccupied. See green: ef = fermi energy: energy @ which probability of occupation = 50% Bandgap doesn"t change w/ temperature change; it"s a property determined by structure of a material.

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