Homework 3 - Jacob Sutker October 1 2006 Nanotechnology...

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Jacob Sutker October 1, 2006 Nanotechnology Homework #3 1. a )Red LED (1.7eV) – GaP0.2As0.8 b )Yellow LED (2.1 eV) – GaP0.7As0.3 c )Green LED (2.3 eV) – GaP1.0As0.0 A d )Blue (2.8 eV) LED cannot be made from this family of solids because the short wavelength of blue light requires high frequency and a high band gap energy which is impossibly high for these materials. In the graph representing the variable x, in order to produce a blue LED x would have to be a number not in the domain of x, therefore that value of X cannot exist and blue LED is impossible to create. 2. a) This solid would have electrical properties similar to metals with a single s valence electron. Since the s band is capable of holding 2 electrons and these atoms only have 1 in their s band, only half the available electron positions are filled. An example of a solid with similar properties is Copper. Since there are vacant energy states adjacent to the highest energy state occupied, very little energy is required to promote electrons into the next energy state. In conclusion any electric field applied to this solid would
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