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Unformatted text preview: ME/ECE 141A  Intro to Nanotechnology Homework 5 due 2/11/09 Please complete these homework problems, due February 11, 2009. (Also note the final project deadlines.) Show your work and always indicate what units you are using whenever you write a number! Quick problem A. A useful resource. a) Go to www.google.com and type h * c / (500 nm) into the search box. What is the result that Google Calculator gives you? b) What is the result when you type in the following? h * c / (500 nm) in eV Google Calculator doesn’t just multiply ( * ) and divide ( / ). It knows constants and units and you are welcome to use it on the homework. Just write “by Google Calc” next to your result. Quick Problem B. a) The semiconductor InSb has a band gap of about 0.2 eV. Approximately what temperature would InSb have to heat up to before a significant number of electrons were excited from the valence band to the conduction band by thermal excitation? (For this problem, let’s assume that the band gap doesto the conduction band by thermal excitation?...
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 Winter '09
 PENNATHUR
 Wavelength, valence band, Band gap, Electronic band structure, Changhui Yang

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