Chemistry In Context
Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 6.8, Problem 6.24YT

(a)

Interpretation Introduction

Interpretation:

For the given doping process, the type of semiconductor has to be given.

Concept Introduction:

n-type semiconductor:

  In this type of semiconductors, conductivity is increased by doping an element with 5 valence electrons (i.e. doped atom acts as a donor impurity).

p-type semiconductor:

  In this type of semiconductors, conductivity is increased by doping an element with 3 valence electrons (i.e. doped atom acts as an acceptor impurity).

(b)

Interpretation Introduction

Interpretation:

For the given doping process, the type of semiconductor has to be given.

Concept Introduction:

n-type semiconductor:

  In this type of semiconductors, conductivity is increased by doping an element with 5 valence electrons (i.e. doped atom acts as a donor impurity).

p-type semiconductor:

  In this type of semiconductors, conductivity is increased by doping an element with 3 valence electrons (i.e. doped atom acts as an acceptor impurity).

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what are p type and n type semiconductors?
Which of these element would convert pure silicon into a n-type semiconductor upon doping? a. phosphorus b. arsenic c. aluminum d. more than one of these
The figure to the right shows sunlight intensity as a function of wavelength. Answer the following questions about materials that could act as the absorber (p-type semiconductor) in a heterojunction solar cell. a.What advantage would there be in using a 1000-nm wavelength bandgap absorber vs. one that had a 400-nm wavelength bandgap? (HINT: the bandgap is the minimum energy required to promote electrons.) b. One reason the electron-volt (eV) is often used as the bandgap unit in solar cell research is that the bandgap in eV is also equal to the maximum voltage that can be generated by the solar cell. With this in mind, what advantage would there be in using a 400-nm wavelength bandgap absorber vs. one that had a 1000-nm wavelength bandgap? c.In light of your answers to (a) and (b), can there be one “best” bandgap to use in a solar cell?

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Chemistry In Context

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