# 11.4 - E45 Lecture Electrical contact between two...

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E45 Lecture 11/4/09

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Electrical contact between two dissimilar metals E=0 Metal A Metal B Φ A Φ B Fermi Level Completely Filled at 0K partially filled at T>0k Φ A = Work Function of Metal A = energy required to remove e - from A to infinity Fermi Level = level with probability of occupancy = 0.5
Electrical contact between two dissimilar metals E=0 Metal A Metal B Φ A Φ B Fermi Level Completely Filled at 0K partially filled at T>0k Once connected, e - s will leave A and go into B. A is positively charged and B is negatively charged => φ A > 0 and φ B < 0 Consequently, after connecting A to B the energy of each electron in A is changed (lowered) by (-e) φ A and the energy of each electron in B is raised by the amount (-e) φ B

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Electrical contact between two dissimilar metals E=0 Metal A Metal B Φ A Φ B Fermi Level Completely Filled at 0K partially filled at T>0k Once connected, e - s will leave A and go into B. A is positively charged and B is negatively charged => φ A > 0 and φ B < 0 Consequently, after connecting
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