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##### ECE 440 - Solid State Electronic Devices - University Of Illinois, Urbana Champaign Study Resources
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###### Ece340Spring04HW1Sol

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 340 Homework I Due: Wednesday, January 28, 2004 (30 points total) Spring 2004 1. How many atoms are found inside a unit cell of a simple cubic (sc), body-centered cubic (bcc), facecentered cubic (fcc), diamond structure, and zinc-blende structure crys

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###### Hw4

School: University Of Illinois, Urbana Champaign

ECE 340 Homework IV Fall 2005 Due: Friday, September 16, 2005 17 3 13 3 1. A compensated germanium sample is doped with 1x10 /cm acceptors and 5x10 /cm donors. (a) What is the electron and hole concentration respectively at room temperature 15 3 13 3 unde

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###### Ece340Spring04hw7sol

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 340 Homework VII Due: Monday, February 23, 2004 Spring 2004 1. In soldering wires to a sample such as that shown in Fig. 3-25, it is difficult to align the Hall probes A and B precisely. If B is displaced slightly down the length of the bar from A, an

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###### Hw6

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 440 Homework VI Due: Friday, October 16, 2009 Fall 2009 Please write your name and net ID on your homework. For full credit please show all work leading to your answer. Note some of the metal work functions given below may differ slightly from the tex

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###### Ece340Spring04HW11Sol

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 340 1. Homework IX Due: Friday, March 19, 2004 Spring 2004 A n+-p Si junction with a long p-region has the following properties: Na =1.5x1016/cm3; n = 1020 cm2/V-s; p = 380 cm2/V-s; n =1 s. If we apply 0.7 V forward bias to the junction at 300 K, what

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###### Ece340Spring04hw13Sol

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 340 Homework XIII Due: Wednesday, April 07, 2004 Spring 2004 1. Redraw Fig. 7-3 for an n+-p-n transistor, and explain the various components of carrier flow and current directions. 2. Sketch the energy band diagram for an n-p-n transistor in equilibri

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###### Ece340Spring04HW10Sol

School: University Of Illinois, Urbana Champaign

Course: Ece440

ECE 340 1. Homework X Due: Monday, March 15, 2004 Spring 2004 When a prolonged diffusion or a high-energy implantation is conducted to form a p/n junction. The doping profile near the junction is usually graded, and the step-junction approach is no longer

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###### Hw14

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XIV Fall 2006 Due: Wednesday, November 15, 2006 1. For an ideal MOS structure, the SiO2 thickness is 200 , and the substrate is doped with 16 3 10 /cm acceptors. Determine the threshold voltage, VT, required to achieve strong inversion an

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###### Hw13

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XIII Fall 2006 Due: Friday, November 10, 2006 1. Field-effect transistors employ a mechanism different from that of BJT to control the output current by changing the charge density in the active region. The following problem is designed t

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###### Hw12

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XII Fall 2006 Due: Wednesday, Nov 01, 2006 + 1. Redraw Fig. 7-3 for an n -p-n transistor, and explain the various components of carrier flow and current directions. 2. Sketch the energy band diagram for an n-p-n transistor in equilibrium

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###### Hw11

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XI Fall 2006 Due: Wednesday, October 25, 2006 1. A Schottky barrier is formed between a metal having a work function of 4.2 eV and p-type Si (electron affinity = 4 eV). The acceptor doping in the Si is 6x1017/cm3. (a) Draw the equilibrium

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###### Hw10

School: University Of Illinois, Urbana Champaign

ECE 440 Homework X Fall 2006 Due: Friday, October 20, 2006 + 17 3 1. A p -n silicon diode (Vo = 0.956 volts) has a donor doping of 10 /cm and an nregion width = 1 m. Does it break down by avalanche or punchthrough? What if the 16 3 doping is only 10 /cm ?

• 4 Pages
###### Hw3_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Solutions Spring 2008 1. (a) It was mentioned in Section 3.2 that the covalent bonding model gives false impression of the localization of carriers. As an illustration, calculate the radius of the electron orbit around the donor in Fi

• 1 Page
###### Hw9

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IX Fall 2006 Due: Monday, October 16, 2006 1. An abrupt Si p-n junction has the following properties at 300 K: p-side -3 n-side 17 Na = 3x10 /cm 3 n = 0.1 s A = 10 cm 15 Na = 6x10 /cm 2 3 p = 10 s 2 n = 1160 cm /V-s 2 p = 420 cm /V-s p

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###### Hw7

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VII Fall 2006 Due: Friday, September 29, 2006 1. Consider a silicon sample at 300 K. Assume that the electron concentration varies linearly with distance. At x=0, the electron concentration is n(0). At x=10 m, the electron concentration i

• 1 Page
###### Hw6

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VI Fall 2006 Due: Monday, September 25, 2006 17 3 1. (a) Construct a semilogarithmic plot such as Fig. 4-7 for GaAs doped with 1x10 /cm 15 3 acceptors and having 2x10 EHP/cm created uniformly at t = 0. Assume that n= p =50 ns. (b) Calcula

• 6 Pages
###### Hw6_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VI Fall 2008 Due: Wednesday, October 08, 2008 1. Consider a silicon sample at 300 K. Assume that the electron concentration varies linearly with distance. At x=0, the electron concentration is n(0). At x=10 m, the electron concentration i

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###### Hw5

School: University Of Illinois, Urbana Champaign

ECE 440 Homework V Fall 2006 Due: Friday, September 22, 2006 2 17 3 1. A Ge bar 1m long and 100 m in cross-sectional area is doped with 1x10 /cm gallium. Find the current at 300 K with 10 V applied assuming that the saturation thermal velocity of 7 electr

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###### Hw3

School: University Of Illinois, Urbana Champaign

ECE 340 Homework III Fall 2006 Due: Monday, September 11, 2006 1. In practice we assume that the intrinsic Fermi level, Ei, coincides with the center of the band gap. In reality it is not true. Derive an expression relating the intrinsic level Ei to the c

• 1 Page
###### Hw15

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XV Fall 2006 Due: Wednesday, November 29, 2006 + 1. An n -polysilicon-gate p-channel MOS transistor is made on an n-type Si substrate with Nd = 16 3 5x10 /cm . The SiO2 thickness is 100 in the gate region, and the effective interface char

• 1 Page
###### Hw16

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XVI Fall 2006 Due: Monday, December 04, 2006 1. A lightly-doped-drain (LDD) structure is incorporated in a MOSFET. To fabricate such a structure, a heavy diffusion or implantation is first used to increase the doping in the drain region.

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###### Exam1_solutions

School: University Of Illinois, Urbana Champaign

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###### Exam2_solutions

School: University Of Illinois, Urbana Champaign

• 12 Pages
• ###### ECE 440 Review Problems
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###### ECE 440 Review Problems

School: University Of Illinois, Urbana Champaign

ECE 444 Fall 2005 Sakulsuk Unarunotai sunarun2@uiuc.edu ECE 440 Review Problems 5.9 18 3 15 3 An abrupt Si p-n junction has N a = 10 cm on one side and N d = 5 10 cm on the other side (a) Calculate the Fermi level positions at 300 K in the p and n regions

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• ###### Final_exam_example_sp03
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###### Final_exam_example_sp03

School: University Of Illinois, Urbana Champaign

In answering the following multiple choice questions select and circle the most nearly correct answers. 1. (5 points) Consider silicon doped with 1017 cm-3 donors which are all ionized. Knowing that the electron concentration is always much greater than t

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• ###### ECE%20440%20Review%20Problems
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###### ECE%20440%20Review%20Problems

School: University Of Illinois, Urbana Champaign

ECE 444 Fall 2005 Sakulsuk Unarunotai sunarun2@uiuc.edu ECE 440 Review Problems 5.9 An abrupt Si p-n junction has N a = 1018 cm 3 on one side and N d = 5 1015 cm 3 on the other side (a) Calculate the Fermi level positions at 300 K in the p and n regions.

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• ###### ECE 440 Review Problems
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###### ECE 440 Review Problems

School: University Of Illinois, Urbana Champaign

x e -0.002 0 0.455 0 -3.48 0 2 1 0 -0.1 0 0.1 0.2 0.3 0.4 0.5 -1 -2 -3 -4 -0.1 0 -0.02 0 -0.02 -1.00E+18 0 -1.00E+18 0 2.00E+16 0.455 2.00E+16 0.455 0.00E+00 0.5 0.00E+00 200000000000000000 0 -0.1 0 -200000000000000000 0.1 0.2 0.3 5x10 -400000000000000000

• 7 Pages
###### Hw4_sol_09

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IV Fall 2009 Due: Friday, September 25, 2009 Print your name and netid legibly. Show all work leading to your answer clearly and neatly. Staple multiple pages. 1. A Si bar is 0.2 cm long and 200 m2 in cross-sectional area. Find the curren

• 4 Pages
###### Hw3_solution

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Fall 2008 Due: Monday, September 15, 2008 1. (a) A GaAs semiconductor crystal is doped with carbon atoms. If the carbon atoms displace arsenic atoms, does the crystal become an n-type or p-type material? Why? (b) For a nonstoichiometr

• 10 Pages
###### HW3_sol

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Fall 2009 Due: Friday, September 18, 2009 Print your name and netid legibly. Show all work leading to your answer clearly and neatly. Staple multiple pages. 1. a) Construct a semi-logarithmic plot for the following experimental result

• 10 Pages
###### Hw5_solution_fall09

School: University Of Illinois, Urbana Champaign

ECE 440 Homework V Fall 2009 Due: Friday, October 09, 2009 Please write your name and net ID on your homework. Show all work leading to your answer. 1. The acceptor profile of a silicon sample is shown below. Assume that the majority carrier mobility can

• 2 Pages
###### Hw17

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XVII Fall 2006 Due: Friday, December 8, 2006 1. Refer to Fig. 1-13. Assuming the lattice constant varies linearly with composition x for a ternary alloy, what composition of GaSb1-xAsx is lattice-matched to InP? What composition of InxGa1

• 1 Page
###### Hw4

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IV Fall 2006 Due: Friday, September 15, 2006 17 3 13 3 1. A compensated germanium sample is doped with 1x10 /cm acceptors and 5x10 /cm donors. (a) What is the electron and hole concentration respectively at room temperature 15 3 13 3 unde

• 1 Page
###### Hw2

School: University Of Illinois, Urbana Champaign

ECE 440 Homework II Fall 2006 Due: Wednesday, September 06, 2006 1. (a) A GaAs semiconductor crystal is doped with carbon atoms. If the carbon atoms displace arsenic atoms, does the crystal become an n-type or p-type material? Why? (b) For a nonstoichiome

• 1 Page
###### Hw1

School: University Of Illinois, Urbana Champaign

ECE 440 Homework I Fall 2006 Due: Wednesday, August 30, 2006 1. How many atoms are found inside a unit cell of a simple cubic (sc), body-centered cubic (bcc), face-centered cubic (fcc), diamond structure, and zinc-blende structure crystal? Find the maximu

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• ###### ECE440_1st HE_Sol Spr05
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###### ECE440_1st HE_Sol Spr05

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• ###### ECE440_1st HE_Sol Fall07
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###### ECE440_1st HE_Sol Fall07

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• ###### ECE440_1st HE Conflict_Sol Fall08
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###### ECE440_1st HE Conflict_Sol Fall08

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###### Ex2_example2_solution

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###### Problem 3

School: University Of Illinois, Urbana Champaign

Solar Cell problem A single p-n junction solar cell with the cross-sectional area of 1 cm x 1 cm is placed in a completely dark environment. The top layer of the p-n junction is a 15 m thick p-type silicon layer and the bottom layer is a 100 m thick n-typ

• 2 Pages
###### Problem 4

School: University Of Illinois, Urbana Champaign

Exam 2 Question 3 Solution (DW) a 18 3 d 15 3 An abrupt p+n junction has N =2x10 cm- , N =5x10 cm- and T=300K. a) (4pts) The pn-junction is reverse biased with V=-5V. What are the excess hole and electron concentrations at the edges of the transition regi

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###### Ex2_example1_solution

School: University Of Illinois, Urbana Champaign

1. The room temperature I-V characteristic of a silicon np junction under reverse bias is shown below. The doping density for the P-side (NA) is 4 times that in the N-side (NA = 4ND). Relevant data is given below: Ln L p L 1 m ; Dn D p D 40 cm 2 ; n i 101

• 1 Page
###### Problem 1 And 2

School: University Of Illinois, Urbana Champaign

ECE 340 Exam 2 Problem 1 - 2 Solution 1. The band diagram of a silicon N-P+ junction at T = 300K is shown below. Assume the intrinsic level is just in the middle of the band gap Ei = Eg /2 and ECn Fn = 0.18eV (a) Calculate the dopant concentration on the

• 11 Pages
###### Example Final Exam

School: University Of Illinois, Urbana Champaign

1) MOS CAPACITOR (20 points) A high-frequency capacitance voltage measurement of a silicon MOS structure was fitted by the following expression, where VG is the gate voltage in units of Volts: C(VG) = 6 pF +12 pF/(1 + exp(VG) The area of the capacitor is

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###### Quiz3

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###### Quiz1D_solution

School: University Of Illinois, Urbana Champaign

• 8 Pages
###### Problem 1 And 3

School: University Of Illinois, Urbana Champaign

ECE 340 February 28, 2012 First Hour Exam Name:_Section_ Useful Formulas and Data: Problem1 A semiconductor has a non-uniform doping profile that results in the band diagram shown in the figure below. At T=300K the energy gap is EG=42kBT, and the intrinsi

• 27 Pages
###### NarrowBaseBJT

School: University Of Illinois, Urbana Champaign

N arrow-BaseD iode A n arrow-base *-n d iode i s s ketched elow a long w ith t he e quilibrium b and p b diagram.D iffusion o f m inority h oles w ithin t he n -regionw ill b e c haracterizedvery simply t hroughu se o f a ' straight-line' a pproximation.

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###### Problem 2

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###### Hw14_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XIV Solutions Fall 2005 Due: Wednesday, November 16, 2005 1. For an ideal MOS structure, the SiO2 thickness is 150 , and the substrate is doped with 16 3 10 /cm acceptors. Determine the threshold voltage, VT, required to achieve strong in

• 6 Pages
###### Hw7_solutions

School: University Of Illinois, Urbana Champaign

• 7 Pages
###### Hw8_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VIII Fall 2005 Due: Monday, October 10, 2005 16 3 17 3 1. An abrupt Si p-n junction has Na = 7x10 /cm on the p-side and Nd = 2x10 /cm on the nside. (a) Calculate the Fermi level positions at 300 K in the p and n regions. P region: 7 1016

• 6 Pages
###### Hw9_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IX Solutions Fall 2005 Due: Monday, October 17, 2005 1. An abrupt Si p-n junction has the following properties at 300 K: -3 n-side p-side 17 3 2 A = 10 cm 15 3 Na = 2x10 /cm Nd = 4x10 /cm n = 0.1 s p = 10 s 2 n = 1200 cm /V-s 2 p = 420

• 7 Pages
###### Hw6_solutions

School: University Of Illinois, Urbana Champaign

17 - p(t) = p + p0 [cm 3] 1.02 Carrier Concentrations x 10 1.015 1.01 1.005 1 0 50 100 150 200 250 300 0 50 100 150 t [ns] 200 250 300 16 - log( n(t) = n + n0 ) [cm 3] 10 15 10 14 10 13 10 12 10

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###### Hw4_solutions

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###### Hw5_solutions

School: University Of Illinois, Urbana Champaign

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###### ECE440fa05_HW1_sol

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###### Hw3_solutions

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###### Hw2_solutions

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• ###### ECE440_1st HE_Sol Spr07
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###### ECE440_1st HE_Sol Spr07

School: University Of Illinois, Urbana Champaign

• 10 Pages
###### Quiz2

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###### Hw11_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 1. Homework XI Summer 2006 (a) Find the voltage VFB required to reduce to zero the negative charge induced at the semiconductor surface by a sheet of positive charge Qox located x below the metal. (b) In the case of an arbitrary distribution of ch

• 6 Pages
###### Hw4_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IV 10 3 Summer 2006 15 3 1. A direct semiconductor with n i = 10 /cm is doped with 10 /cm donors. Its low-level carrier -7 lifetime n = p = 10 sec. (a) If a sample of this material is uniformly exposed to a steady optical generation rate

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###### Hw5

School: University Of Illinois, Urbana Champaign

ECE 440 Homework V Summer 2006 Due: Thursday, June 29, 2006 14 1. A 1-cm long Ge bar has a linear acceptor distribution NA = 10 3 (1 +ax) /cm , where a = 10/mm. (a) Plot the hole carrier distribution at equilibrium at 300 K from x=0 to 1 cm. (b) Estimate

• 3 Pages
###### Hw3_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Summer 2006 1. Calculate both the electron and hole concentrations for a germanium sample doped with 16 3 1x10 arsenic atoms/cm Doping germanium with arsenic will make the sample n-type. Thus, ND = 1x1016 cm-3. To find the concentrati

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###### Hw1_solution

School: University Of Illinois, Urbana Champaign

ECE 440 Homework I Solutions Summer 2006 1. Assuming that the lattice constant varies linearly with the composition, determine the unit cell side length for a silicon-germanium alloy (in diamond structure) which has an atomic 22 3 density of 4.5x10 atoms/

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###### Hw3

School: University Of Illinois, Urbana Champaign

ECE440 HomeworkIII Summer2006 Due:Thursday,June22,2006 1. Calculateboththeelectronandholeconcentrationsforagermaniumsampledopedwith 16 3 1x10 arsenicatoms/cm (a)atroomtemperature(b)at450K. 14 3 13 3 2. Agermaniumsampleisdopedwith1x10 /cm acceptorsand6x10

• 5 Pages
###### Hw2_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework II Summer 2006 1. An InP semiconductor crystal is doped with tin atoms. If the tin displaces phosphorous atoms, does the crystal become an n-type or p-type material? Why? InP is a III V compound semiconductor. Tin (Sn) is a column IV elem

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###### Hw2

School: University Of Illinois, Urbana Champaign

ECE440 HomeworkII Summer2006 Due:Tuesday,June20,2006 1. AnInPsemiconductorcrystalisdopedwithtinatoms.Ifthetindisplacesphosphorous atoms,doesthecrystalbecomeanntypeorptypematerial?Why? 2. CalculateandexplicitlyplottheFermifunctionversusenergyfromE=EF0.20eV

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###### Hw1

School: University Of Illinois, Urbana Champaign

ECE440 HomeworkI Summer2006 Due:Thursday,June15,2006 1. Assumingthatthelatticeconstantvarieslinearlywiththecomposition,determinetheunit cellsidelengthforasilicongermaniumalloy(indiamondstructure)whichhasanatomic 22 3 densityof4.5x10 atoms/cm .Also,findthe

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###### Hw13_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XIII Fall 2008 Due: Monday, Dec. 08, 2008 1. Other than aluminum, polysilicon is another common gate metal for the MOS structure in silicon. By incorporating heavy doping during chemical vapor deposition of polysilicon one can greatly inc

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###### Hw13

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XIII Fall 2008 Due: Monday, Dec. 08, 2008 1. Other than aluminum, polysilicon is another common gate metal for the MOS structure in silicon. By incorporating heavy doping during chemical vapor deposition of polysilicon one can greatly inc

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###### Hw12_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XII Fall 2008 Due: Monday, December 01, 2008 1. Field-effect transistors employ a mechanism different from that of BJT to control the output current by changing the charge density in the active region. The following problem is designed to

• 1 Page
###### Hw4

School: University Of Illinois, Urbana Champaign

ECE440 HomeworkIV Summer2006 Due:Tuesday,June27,2006 10 3 15 3 1. Adirectsemiconductorwithni=10 /cm isdopedwith10 /cm donors.Itslowlevelcarrier 7 lifetimen=p=10 sec.(a)Ifasampleofthismaterialisuniformlyexposedtoasteadyoptical 22 3 generationrateofgop=2x10

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###### Hw6

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VI Summer 2006 Due: Thursday, July 06, 2006 17 3 15 3 1. An abrupt Si p-n junction has NA = 3 x 10 /cm on the p-side and ND = 2x10 /cm on the n-side. (a) Calculate the Fermi level positions in the p and n regions at 300 K. (b) Draw an equ

• 6 Pages
###### Hw10_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework X Solutions Summer 2006 1. Redraw Fig. 6-12 for the p-channel (n-type substrate) case. Also include schematic drawings showing the electric circuit and contact configurations. 1 15 3 2. An ideal MOS capacitor which is made on an n-type Si

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###### Hw11

School: University Of Illinois, Urbana Champaign

ECE 440 1. Homework XI Summer 2006 Due: Tuesday, August 01, 2006 (a) Find the voltage VFB required to reduce to zero the negative charge induced at the semiconductor surface by a sheet of positive charge Qox located x below the metal. (b) In the case of a

• 5 Pages
###### Hw9_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IX Due: Thursday, July 20, 2006 Summer 2006 + 1. Assume that a p -n diode is built with an n region width l smaller than a hole diffusion length ( l < Lp). This is the so-called narrow base diode. Since for this case holes are injected in

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###### Hw9

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IX Due: Thursday, July 20, 2006 Summer 2006 + 1. Assume that a p -n diode is built with an n region width l smaller than a hole diffusion length ( l < Lp). This is the so-called narrow base diode. Since for this case holes are injected in

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###### Hw5_solutions

School: University Of Illinois, Urbana Champaign

ECE440 HomeworkV Summer2006 14 3 1. A1cmlongGebarhasalinearacceptordistributionNA=10 (1+ax)/cm ,wherea= 10/mm. (a)Plottheholecarrierdistributionatequilibriumat300Kfromx=0to1cm. Theapproximation p0 N A isvalidif N A n i .Sincetheminimumvalueofthevariable d

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###### Hw8_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VIII Solutions + Summer 2006 17 3 1. A p -n silicon diode (Vo = 0.956 volts) has a donor doping of 2x10 /cm and nregion width = 1 m. Does it break down by avalanche or punchthrough? What if the 16 3 doping is only 1.5x10 /cm ? Refer to Fi

• 1 Page
###### Hw10

School: University Of Illinois, Urbana Champaign

ECE 440 Homework X Summer 2006 Due: Thursday, July 27, 2006 1. Redraw Fig. 6-12 for the p-channel (n-type substrate) case. Also include schematic drawings showing the electric circuit and contact configurations. 15 3 2. An ideal MOS capacitor which is mad

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###### Exam1

School: University Of Illinois, Urbana Champaign

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###### Hw8

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VIII Due: Monday, July 17, 2006 + Summer 2006 17 3 1. A p -n silicon diode (Vo = 0.956 volts) has a donor doping of 2x10 /cm and nregion width = 1 m. Does it break down by avalanche or punchthrough? What if the 16 3 doping is only 1.5x10

• 6 Pages
###### Hw6_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VI 17 Summer 2006 3 15 3 1. An abrupt Si p-n junction has NA = 3 x 10 /cm on the p-side and ND = 2x10 /cm on the n-side. (a) Calculate the Fermi level positions in the p and n regions at 300 K. P region: (1) Ei E f = 3 1017 kT p ln = .0

• 7 Pages
###### Hw7_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VII 17 3 Summer 2006 15 3 1. A Si step junction has NA = 10 /cm , ND = 8 x 10 /cm and a cross-sectional area -4 2 -8 -7 of 10 cm . Assume that minority carrier life times n = 10 sec and p = 10 sec. The diode is forward biased at V = (2/3)

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###### Hw7

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VII Due: Wednesday, July 12, 2006 17 3 15 Summer 2006 3 1. A Si step junction has NA = 10 /cm , ND = 8 x 10 /cm and a cross-sectional area -4 2 -8 -7 of 10 cm . Assume that minority carrier life times n = 10 sec and p = 10 sec. The diode

• 8 Pages
###### Hw11_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XI Fall 2008 Due: Monday, Nov. 17, 2008 1. Redraw Fig. 7-3 for an n+-p-n transistor, and explain the various components of carrier flow and current directions. 2. Sketch the energy band diagram for an n-p-n transistor in equilibrium (all

• 1 Page
###### Hw11

School: University Of Illinois, Urbana Champaign

ECE 440 Homework XI Fall 2008 Due: Monday, Nov. 17, 2008 1. Redraw Fig. 7-3 for an n+-p-n transistor, and explain the various components of carrier flow and current directions. 2. Sketch the energy band diagram for an n-p-n transistor in equilibrium (all

• 4 Pages
###### Hw3_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Fall 2008 Due: Monday, September 15, 2008 1. (a) A GaAs semiconductor crystal is doped with carbon atoms. If the carbon atoms displace arsenic atoms, does the crystal become an n-type or p-type material? Why? (b) For a nonstoichiometr

• 1 Page
###### Hw4

School: University Of Illinois, Urbana Champaign

ECE 440 Homework IV Fall 2008 Due: Monday, September 22, 2008 1. In practice we assume that the intrinsic Fermi level, Ei, coincides with the center of the band gap. In reality it is not true. Derive an expression relating the intrinsic level Ei to the ce

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###### Hw2_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework II Fall 2008 Due: Monday, September 08, 2008 1. Gold, one of the best conductors, has a face-centered cubic lattice. The lattice constant is 4.08. The force holding the lattice together is the metallic bonding, i.e. an interaction between

• 1 Page
###### Hw3

School: University Of Illinois, Urbana Champaign

ECE 440 Homework III Fall 2008 Due: Monday, September 15, 2008 1. (a) A GaAs semiconductor crystal is doped with carbon atoms. If the carbon atoms displace arsenic atoms, does the crystal become an n-type or p-type material? Why? (b) For a nonstoichiometr

• 1 Page
###### Hw2

School: University Of Illinois, Urbana Champaign

ECE 440 Homework II Fall 2008 Due: Monday, September 08, 2008 1. Gold, one of the best conductors, has a face-centered cubic lattice. The lattice constant is 4.08. The force holding the lattice together is the metallic bonding, i.e. an interaction between

• 4 Pages
###### Hw1_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework I Solutions Fall2008 1. How many atoms are found inside a unit cell of a simple cubic (sc), body-centered cubic (bcc), face-centered cubic (fcc), diamond structure, and zinc-blende structure crystal? Find the maximum fractions of the unit

• 1 Page
###### Hw1

School: University Of Illinois, Urbana Champaign

ECE 440 Homework I Fall 2008 Due: Wednesday, September 03, 2008 1. How many atoms are found inside a unit cell of a simple cubic (sc), body-centered cubic (bcc), face-centered cubic (fcc), diamond structure, and zinc-blende structure crystal? Find the max

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###### Formula

School: University Of Illinois, Urbana Champaign

• 1 Page
###### _hw9

School: University Of Illinois, Urbana Champaign

#Mac OS X # #2#ATTR;#x# # # # # # # # # # # #

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###### _hw8

School: University Of Illinois, Urbana Champaign

#Mac OS X # #2#ATTR;#x# # # # # # # # # # # #

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###### Hw7_solutions

School: University Of Illinois, Urbana Champaign

ECE 440 Homework VII Fall 2008 Due: Monday, October 20, 2008 1. An abrupt Si p-n junction has Na = 6x1016/cm3 on the p-side and Nd = 2x1017/cm3 on the nside. (a) Calculate the Fermi level positions at 300 K in the p and n regions. P region: (1) Ei Ef = kT

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