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Unformatted text preview: 1 ECE 495W EXAM I 1 page of notes Friday Sept. 29, 2006 NAME : PUID # : Please show all work and write your answers clearly. This solution should have four pages. Problem 1 [p. 2,] 8 points Problem 2 [p. 3] 8 points Problem 3 [p. 4] 9 points Total 25 points 2 Problem 1 (a) 5 points A channel has a density of states as shown, given by D ( E ) = D + D 1 ( E + 0.1 eV ) 2 where D = 0.1 / eV, and D 1 = 2 / eV 3 . It is connected to two contacts with the same electrochemical potential . Is there a current in the external circuit ? If so, is it in the direction shown (from the hot to the cold contact) or opposite to the direction shown (from the cold to the hot contact)? Explain your reasoning. Inside the channel Electrons flow from hot to cold above , and from cold to hot below . D(E) is higher for energies above than for energies below . Hence net flow of electrons is from hot to cold....
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This note was uploaded on 02/19/2012 for the course ECE 495w taught by Professor Supriyodatta during the Fall '06 term at Purdue University-West Lafayette.
- Fall '06