/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 12 How would you expect the conduct... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 37: Problem 12

How would you expect the conductivity of an undoped semiconductor to depend on temperature? Why?

Short Answer

Expert verified
The conductivity of an undoped semiconductor is expected to increase with an increase in temperature. This is due to the increased thermal energy that allows more electrons to move from the valence to the conduction band, thus increasing the number of charge carriers.

Step by step solution

01

Understanding Undoped Semiconductors

Undoped semiconductors, also known as intrinsic semiconductors, are pure semiconductors without any significant impurities. Two types of carriers contribute to the conduction: Electrons and holes. At absolute zero temperature, all the valence electrons are tightly bound to the parent atoms, and no free electrons are available to conduct electricity.
02

Effect of Temperature

As the temperature increases, thermal energy makes the electrons gain enough energy to overcome the energy gap (band gap) between the valence band and the conduction band. Whenever an electron moves from the valence band to the conduction band, it leaves behind a hole in the valence band. The electron in the conduction band and the hole in the valence band both contribute to the conduction of electricity.
03

Conclusion

Thus, the conductivity of an undoped semiconductor will increase with the increase in temperature. This is because, as the temperature increases, more electrons receive enough energy to jump from the valence band to the conduction band, thereby increasing the number of carriers (both electrons and holes). Therefore, the conductivity of the semiconductor increase.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Does it make sense to distinguish individual NaCl molecules in a salt crystal? What about individual \(\mathrm{H}_{2} \mathrm{O}\) molecules in an ice crystal? Explain.

Find the wavelength of a photon emitted in the \(l=5\) to \(l=4\) transition of a molecule whose rotational inertia is \(1.75 \times 10^{-47} \mathrm{kg} \cdot \mathrm{m}^{2}\).

Is it useful to think of the highest-energy electrons as "belonging" to individual atoms in an ionically bonded molecule? In a covalently bonded molecule?

Find the wavelengths emitted in all allowed transitions between the first three rotational states in the \(n=1\) level to any states in the \(n=0\) level in \(\mathrm{H}_{2},\) whose rotational inertia and classical vibration frequency are \(4.60 \times 10^{-48} \mathrm{kg} \cdot \mathrm{m}^{2}\) and \(3.69 \times 10^{14} \mathrm{Hz}, \mathrm{re}-\) spectively.

Green fluorescent protein (GFP) is a substance that was first extracted from jellyfish; variants are used to "tag" biological molecules for study. The original "wild" GFP absorbs 395 -nm light, undergoing an upward transition to an excited state. Movement of a proton within the protein then excites it to 2.44 eV above the ground state. Photons emitted in the subsequent downward transition to the ground state provide a visual indication of the GFP's location as seen in a microscope. What's the wavelength of these photons?
See all solutions

Recommended explanations on Physics Textbooks

Particle Model of Matter

Read Explanation

Electric Charge Field and Potential

Read Explanation

Solid State Physics

Read Explanation

Electromagnetism

Read Explanation

Fields in Physics

Read Explanation

Magnetism

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.