11) Suppose there is a semiconductor with a large band gap, Eg = 1.75eV. This means that the semiconductor absorbs photons with energies > 1.75eV. Which wavelengths (in nm), if any, will the semiconductor not absorb? Correct calculations/units are required to receive full credit. Answer(s): а. 475 b. 720 с. 545 d. 695 е. 615 f. none of the choices

11) Suppose there is a semiconductor with a large band gap, Eg = 1.75eV. This means that the semiconductor absorbs photons with energies > 1.75eV. Which wavelengths (in nm), if any, will the semiconductor not absorb? Correct calculations/units are required to receive full credit. Answer(s): а. 475 b. 720 с. 545 d. 695 е. 615 f. none of the choices

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter8: Molecules And Materials

Section: Chapter Questions

Problem 8.97PAE: 8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap...

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8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap in the material. Generally, in order to have a larger band gap, the dopant should be smaller than the main material. If you are a materials engineer and need a semiconductor that has lower conductivity thin pure silicon, what clement or elements could you use as your dopant? (You do not want either an n- or a p- type material) Explain your reasoning.
The band gap for the elemental semiconductor silicon is 1.11 eV. That energy corresponds to what wavelength and region of the electromagnetic spectrum? (1eV = 1.602 x 10-19J) Group of answer choices 1117 nm; Infrared 1117 nm; Ultra-violet 1.117 x 10E(-6) nm; Infrared 1.778 x 10E(-19) J; Ultra-violet
The semiconductor CdSe has a band gap of 1.74 eV. Whatwavelength of light would be emitted from an LED madefrom CdSe? What region of the electromagnetic spectrum isthis?
The first LEDs were made from GaAs, which has a bandgap of 1.43 eV. What wavelength of light would be emittedfrom an LED made from GaAs? What region of theelectromagnetic spectrum does this light correspond to: ultraviolet,visible, or infrared?
The equilibrium density of vacancies ns is given by Nexp(-Es/kT) , where N is the density of semiconductor atoms and Es is the energy of formation. Calculate ns in silicon at 27° C, 900 ° C, and 1200° C. Assume Es = 2.3 eV.
What is the difference in energy between the valence band and conduction band of electrical conductors, semiconductors and insulators? Explain in scheme and give at least one example for each of that three types materials.
How may the conductivity of an intrinsic semiconductor be increased?
Silicon has a band gap of 1.1 eV at room temperature.(a) What wavelength of light would a photon of this energycorrespond to? (b) Draw a vertical line at this wavelength inthe figure shown, which shows the light output of the Sunas a function of wavelength. Does silicon absorb all, none,or a portion of the visible light that comes from the Sun?(c) You can estimate the portion of the overall solar spectrumthat silicon absorbs by considering the area under thecurve. If you call the area under the entire curve “100%,”what approximate percentage of the area under the curve isabsorbed by silicon?
Which of the following doped semiconductors will be p-type and which will be n-type (i)Arsenic in germanium (ii) Germanium in Silicon (ii) Indium in Germanium(iv) Silicon on antimony sites in Indium antimonide (InSb).(v) Magnesium on Gallium sites in gallium nitride(GaN).
3) What is the difference in energy between the valence band and conduction band of electrical conductors, semiconductors and insulators? Explain in scheme and give at least one example for each of that three types materials. Başlık ekle... > Cadı
(c) Explain what happens when a pure semiconductor made up of Silicon is doped with an Indium atom during manufacture. Explain on the availability of the Carriers created as a result of this doping with the help of a neat sketch.