EMS172L-Final-Exam-Solution-2009 (1)

EMS172L-Final-Exam-Solution-2009 (1) - UC Davis EMS 107L...

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UC Davis – EMS 107L Electronic, Magnetic, and Optical Properties Laboratory – Prof. Ricardo Castro 1 UNIVERSITY OF CALIFORNIA, DAVIS Department of Chemical Engineering and Materials Science EMS 172L: Electronic, Magnetic, and Optical Properties Laboratory Name: Solutions ___________________________________ Number: _________________________ Signature: ________________________________________ Final Exam 12/04/2009 Question 01 : A wise engineer decided to install solar cells inside the company building he works in (a closed room with artificial light). (a) What light color (room light) would you suggest for him to use to maximize the solar cells efficiency: blue (475 nm), green (510 nm), yellow (570 nm), or red (650 nm), and why? (b) Make a schematic representation of a solar cell based on a p-n junction. E = ν h (a) (2.0 points) Solar cells work in a relative quantum way. You need a minimum energy quantified to excite an electron from p to n-type semiconductor. Higher energies will also
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This note was uploaded on 05/14/2010 for the course EMS 172L taught by Professor R.castro during the Spring '10 term at UC Davis.

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EMS172L-Final-Exam-Solution-2009 (1) - UC Davis EMS 107L...

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