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Unformatted text preview: ECE 331: Midterm I, April 7, 2008 NAMEwﬂ/L—TM ; 6a (raw J PLEDGE: “No aid given, received or observed.” Signature o FILL YOUR NAME AND PLEDGE YOURSELF TO FINISH THIS EXAM
INDEPENDENTL Y. . ALL QUESTIONS MUST BE ANSWERED ON THE PAGES PROVIDED. WHEN
NECESSARY USE THE BACK OF THE PAGE TO COMPLETE THE QUESTION. . CLOSED BOOKS, ONEPAGE HANDWRITTEN NOTES. . IT IS SUGGESTED THAT YOU ANSWER FIRST THE QUESTIONS YOU
CONSIDER EASIES T. Free electron mass mo 9.11 x 10'31 Kg
Electron charge q 1.60 x 10'19 C
Permittivity of free space so i 8.85 x 10'12 F/m
Boltzman constant kg 1.38 x 10"23 J/K
Planck’s constant 6.63 x 10'3'4 Js
Avogadro’s number NA 6.02 x 1023 /mole
Speed of light 3.00 x 108 m/s 1. (a) Provide one example each of an elemental semiconductor and a compound semiconductor.
(4 points) smtcom'm r g? , SQ "t mack
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WM Mamas = GaAaﬁnfSSe/GJJ 9%: .
(b) Give the electronic conﬁgurations of Al(13), Cr(24), and Ge (32). (6 points) (‘1’) ‘ lszzszzyéaszay‘ t
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(£19122) : letzélzféas‘sg‘aol 4S 4? l WM PLEASE INDICATE if you use the back of this page 2. (a) What crystal structure does Si single crystal have? (3 points)
btm/‘AGJ CW‘lC Q‘K’V‘VAVW % Kt ; (b) Calculate the atomic packing factor (APF) of a unit cell of Si single crystal. (7 points) ﬁE/V‘Q (are Q 8‘03WM9 \n at alle QUlclc. CQ'U .. PLEASE INDICATE if you use the back of this page ' '(b) If the lattice constant is a, calculate the planar densities of (110) and (111) planes in an FCC
cubic crystal. (14 points) O; Vz’l’g“
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(c) For an FCC crystal, such as aluminum, would you eXpect the surface energy for a (110) plane
to be greater or less than that for a (111) plane? Why? (10 points) I l avg: glnca ’PDN >‘PD\\° 5&0; 00‘qu Jessie We;
9 a We We Mus millae ﬁrm ‘ch A’Le Que) Plama‘
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RAM MC meme/9r meIoOLLW in Review“? We WK twig allugarsgoalﬁwte an) Plate, m‘gg 4a a \euu ﬁcﬂ PLEASE INDICATE if you use the back of this page 4. Calculate the radiUS cf an iridium atom given that Ir has an FCC crystal structure, a density of
22.4 g/cm3, and an atomic weight of 192.2 g/mol. (10 points) .(JM/ [\wa 0£,@%Q\WWPCC MR C2L[
:LX8(+_£,<Q :4 PLEASE INDICATE if you use the back of this page ...
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