Lesson: Pure Semiconductors Physics • 9th Grade

In this lesson, we will learn how to describe the electrical bonds in pure semiconductor materials.

Lesson Plan

Students will be able to

describe the motions of free electrons between atoms in an atomic lattice of a semiconducting element,
relate the abundance of free electrons to vacancies in an atomic lattice of a semiconducting element,
describe the effect of temperature changes and equilibrium temperature on a pure semiconductor,
distinguish between interactions involving valence electrons and other bound electrons.

Lesson Presentation

Lesson Video

Lesson Explainer

Sample Question Videos

03:32

Lesson Worksheet

Q1:

In a pure semiconductor at a temperature of 320 K, the number of free electrons in the semiconductor is . The temperature of the semiconductor is increased to 420 K. Which of the following correctly describes how changes? The semiconductor is in thermal equilibrium at both temperatures.

Q2:

The following diagrams show a lattice of atoms. Which of the diagrams shows the lattice at a higher temperature?

Q3:

The diagram below shows a lattice of atoms where a free electron is adjacent to a vacancy. Which of the following diagrams most correctly represents the lattice a short time later?