3) The work functions of gallium antimonide (GaSb), gallium phosphide (GaP) and gallium nitride (GaN) semiconductors 0.73, 2.24 and 3.4 eV, respectively are (https://www.rp-photonics.com/band gap.html). Calculate: a) the threshold frequencies v. for the gallium antimonide, gallium phosphide and gallium nitride semiconductors. b) the longest wavelength of the electromagnetic radiation that can eject electron from the gallium antimonide, gallium phosphide and gallium nitride. c) If it is planned to use them in visible light, which of them is selected? Why? d) If you plan to use the semiconductor as photocatalyst at 450 nm in visible region, is it possible to eject electron from the appropriate semiconductor?

3) The work functions of gallium antimonide (GaSb), gallium phosphide (GaP) and gallium nitride (GaN) semiconductors 0.73, 2.24 and 3.4 eV, respectively are (https://www.rp-photonics.com/band gap.html). Calculate: a) the threshold frequencies v. for the gallium antimonide, gallium phosphide and gallium nitride semiconductors. b) the longest wavelength of the electromagnetic radiation that can eject electron from the gallium antimonide, gallium phosphide and gallium nitride. c) If it is planned to use them in visible light, which of them is selected? Why? d) If you plan to use the semiconductor as photocatalyst at 450 nm in visible region, is it possible to eject electron from the appropriate semiconductor?

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter2: Electrical Components And Circuits

Section: Chapter Questions

Problem 2.10QAP

See similar textbooks

Similar questions

Strontium titanate (SrTiO3) is another wide bandgap semiconductor that has been investigated for use in dyesensitized solar cells. Depending on morphology and pHthe conduction band of SrTiO3 lies around -.2 V vs. SHE.What energies for the HOMO and LUMO of a sensitizingdye would you specify for electron injection into the conduction band of strontium titanate and for water oxidationby the radical cation formed by photoexcitation?
Using a simple infinite barrier approximation, calculate the “effective bandgap” of a 10 nm GaAs/AlGaAs quantum well grown along [001] direction. If there is a one-monolayer fluctuation in the well size, how much will the effective bandgap change? This example gives an idea of how stringent the control has to be in order to exploit heterostructures.
Discuss glass transition temperature and the factors affecting GTT and what are its significances. Give detailed answer please
Why in packed columns, all three terms contribute to band broadening, but in open tubular columns, A is zero.
write a summary of each of the techniques for measuring vacancyconcentrations, noted therein. (1) Measurements of the quenched-in residual electricalresistivity of aluminium rapidly cooled from temperatures be-low about 800 K with initial quenching rates of 2 × 106 K s−1give the enthalpy of formation of monovacancies H F1V =(0.65 ± 0.01) eV.(2) Comparison of the quenching data with high-temperature differential-dilatometry data gives the monova-cancy formation entropy SF1V = (0.76 ± 0.4)kB (kB =Boltzmann’s constant) and the low-temperature resistivity perunit concentration of vacancies ρ1V = (1.9 ± 0.1) μm.(3) The binding enthalpy of divacancies in Al is H B2V =(0.17 5 ± 0.02 5) eV. This is in agreement with earlier ex-perimental determinations by Doyama and Koehler 48) and byLevy et al. 49, 50) but in marked contrast to the claim of Carlinget al., 23) based on computations with the generalized gradi-ent approximation, that in Al H B2V is zero or even negativeand therefore the…
Give some of the application of Coloumetry, Potentiometey, Electrogravimetry and Voltammetry in different fields.
What is a matrix used in cyclic voltammetry? Define and give example of such
An atomic beam is designed to function with (a) cadmium, (b) mercury. The source is an oven maintained at 380K with a small slit of dimensions 1.0cm x 1.0 x 10-3cm. The vapor pressure of cadmium is 0.13 Pa nd that of mercury is 12 Pa at this temperature. What is the atomic current (the number of atoms per second) in the beams?
A coherently strained quantum well laser has to be made from InxGa1-xAs on a GaAs substrate. If the minimum thickness of the region is 50 Ǻ, calculate the maximum composition of In that can be tolerated. Assume that the lattice constant of the alloy can be linearly interpolated from its components.
Consider the following series of poly(phenylene oxide) polymers A–D, and their glass transition temperatures. Explain how the differences in structure can account for the differences in Tg
1. What are the practical implications of alloying in carbon and alloy steels? 2. Make use of drawings of segments of the Fe-Cr phase diagram to illustrate the reason for the existence offerritic, martensitic and austenitic stainless steels by also noting the influence of specific alloying elementswhere-applicable. .
What are the main advantages and limitations of the Valencia Linkage Theory?