Please correct answer and don't use hand raiting Briefly describe a model of a p-type semiconductor immersed in a 0.1 M H2SO4 acid solutionat equilibrium. (a) Identify the various layers in the semiconductor/solution interface, andthe expected potential difference across this interface. (b) Sketch and explain an ideal i/Ebehavior for a p-type semiconductor in the dark and under illumination.

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Answered: Briefly describe a model of a p-type…

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter21: The Solid State: Crystals

Section: Chapter Questions

Problem 21.61E

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At room temperature (i.e., 300 K), a semiconductor made of gallium arsenide (GaAs) has an intrinsic electron concentration (ni) of 1.8×10^6 cm^-3 , an electron mobility (μe) of 8500 cm^2 V^1 s^-1 , and a hole mobility (μh) of 400 cm^2 V^-1 s^-1 . \ (a) Calculate the intrinsic electric conductivity and resistivity of GaAs at 300 K. (b) When GaAs is doped with an ionized donor concentration of 10^15 cm^-3 , where is the Fermi level? Calculate the electric conductivity of the doped GaAs. (c) If the semiconductor sample discussed in (b) is further doped with an ionized acceptor concentration of 9×10^14 cm^-3 , what is the free hole concentration and electric conductivity of the sample?
Manganese silicide has the empirical formula MnSi andmelts at 1280 °C. It is insoluble in water but does dissolvein aqueous HF. (a) What type of compound do you expectMnSi to be: metallic, molecular, covalent-network, orionic? (b) Write a likely balanced chemical equation for thereaction of MnSi with concentrated aqueous HF.
Resistivity measurements at 300 K show that an annealed metal single crystal has amonovacancy concentration CV = 10-9. When the same crystal is quenched from a hightemperature, the measurements indicate CV = 2x10-3. Calculate the temperature of thequench [Take Hf = 51.4 kJ/mol and R = 8.314 J/mol.K]. State any assumption involved. (5)(b) Explain why the esistivity of a metal is expected to be found more at room temperature after quenching. Hint: Use Matthiessen’s rule (find out by self-studying and cite thesource.)
The forward-bias voltage (V) required to maintain a PN diode current (I) is a function of the temperature (T). (a) Derive an expression for δV/δT (b) What is a typical value for a silicon diode? (c) Compare the result of (b) with a numerical value extracted.
Magnesium is obtained by electrolysis of molten MgCl2.(a) Why is an aqueous solution of MgCl2 not used in theelectrolysis? (b) Several cells are connected in parallel byvery large copper bars that convey current to the cells.Assuming that the cells are 96% efficient in producing thedesired products in electrolysis, what mass of Mg is formedby passing a current of 97,000 A for a period of 24 h?
A student designs an ammeter (a device that measureselectrical current) that is based on the electrolysis of waterinto hydrogen and oxygen gases. When electrical currentof unknown magnitude is run through the device for 2.00min, 12.3 mL of water-saturated H2(g) is collected. Thetemperature of the system is 25.5 °C, and the atmosphericpressure is 768 torr. What is the magnitude of the current inamperes?
(2) Boron is diffused into an intrinsic Si sample, giving the acceptor distribution shown in the Figure below. N a. Sketch thee equilibrium band diagram, and show the direction of the resulting electric field, for N(x)>>n¡ b. Repeat it for phosphorus diffusion for N(x)>>N;
Before 1886, metallic aluminum was so rare that a bar of it was displayed next to the Crown Jewels at the Paris Exposition of 1855. Today, aluminum is obtained commercially from aluminum oxide by the Hall–Heroult process, an electrolytic process that uses molten Al2O3 and cryolite (Na3AlF6). As the operation proceeds, molten Al sinks to the bottom of the cell. The overall reaction is 2Al2O3(l) + 3C(s) → 4Al(l) + 3CO2(g); however, the process is only approximately 90% efficient. How much aluminum (in grams) is deposited if electrodeposition occurs for 24 h at 1.8 A?
Given: Pb2*(aq) + 2e = Pb(s); E° =-0.13 V 2H*(aq) + 2e = H2(g); E° = 0.00 V %3D NO3 (aq) + 4H*(aq) + 3e= NO(g) + 2H,0(1); E° = 0.96 V O2(g) + 4H"(aq) + 4e 2H20(1); E° = 1.23 V PbO2(s) + SO4 (aq) + 4H"(aq) + 2e PBSO,(s) + 2H20(); E° = 1.69 V Under standard-state conditions, which of the following is the best oxidizing agent? O a) Pb2+ () b) NO3 O c) PbO2 O d) H* e) 02
4. (1) Describe the difference between the Resistance and Resistivity. (2) What is Soliton and Polaron? Explain in detail.
In the Hall–Héroult process for the electrolytic production of aluminum, Al3+ ions from Al2O3 dissolved in molten cryolite (Na3AlF6) are reduced to Al(l) while carbon (graphite) is oxidized to CO2 by reaction with oxide ions.(a) Write balanced equations for the half-reactions at the anode and at the cathode, and for the overall cell reaction.(b) If a current of 50,000 A is passed through the cell for a period of 24 hours, what mass of aluminum will be recovered?
Please assist with the following sub questions of question 1. a) The conductivity of a 0.05M solution of acetic acid at 18⁰C is 4.4×10-4 (ohms)-1cm-1. Limiting molar conductivity of acetic acid at the same temperature is 387 (Ohms)-1cm². Calculate the dissociation constant (Ka) of acetic acid? b) The resistivity of aluminum is 2.824×10-8 ohms.m. Calculate the potential drop across a piece of aluminum wire that is 2.0 mm in diameter and 1.00 m long. Assume current is 1.25 A. C) Calculate the conductance and conductivity of a metal if the resistivity of the metal is 2.824×10-8 ohms.m, with resistance of 9.0×10-3 ohms when current is 1.25 A.

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