Why is hole mobility less

In conductors, electrons are loosely bound to the nucleus hence, can detach easily at room temperature. Also, a large number of free electrons thus, available are conduction electrons. When the covalent bond breaks, electrons are freed from the atom. So there are no holes in conduction level to carry hole current.

Each semiconductor material contains two types of freely moving charges: electrons negative charges and holes positive charges. Electrons are the more abundant, or majority, carrier in n-type materials, holes being the less abundant, or minority, carrier.

Temperature dependence of mobility With increasing temperature, phonon concentration increases and causes increased scattering. Thus lattice scattering lowers the carrier mobility more and more at higher temperature. An electron hole is one of the two types of charge carriers that are responsible for creating electric current in semiconducting materials.

Holes can move from atom to atom in semiconducting materials as electrons leave their positions. Skip to content Popular. February 28, Joe Ford. Table of Contents. A free electron is an atom that is not attached to any atom and is free to move anywhere.

Begin typing your search term above and press enter to search. Press ESC to cancel. Skip to content Home Physics Why is hole mobility less? Ben Davis February 14, Why is hole mobility less? How is carrier mobility calculated? What is effective mobility? What is called the mobility of carriers?

What is meant by carrier diffusion? Why are holes positive? In other words, electron mobility constitutes hole current.

Since moving electrons constitute hole current, why is then the mobility of holes lesser than the mobility of electrons? The conduction electrons reside in the conduction band and the missing electrons holes reside in the valence band of the semiconductor.

The conduction band electron effective mass is usually smaller than the valence band hole effective mass. This is one of the reasons that in a semiconductor the electron mobility is usually larger than the hole mobility. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Why is then the mobility of holes lesser than the mobility of electrons? Ask Question.