Electrons in Material Science

It means that the electrons are not bound to specific atoms and can move randomly within the material.

The random movement allows electrons to collide and transfer energy, facilitating the flow of electric current.

The lattice structure provides a framework that allows electrons to move freely while maintaining the integrity of the material.

<p>Metals have a higher density of free-moving electrons compared to insulators, which limits electron mobility.</p> Signup and view all the answers

<p>Yes, as temperature increases, the movement of electrons becomes more energetic, enhancing conductivity in certain materials.</p> Signup and view all the answers

<p>A 'hole' represents a unit positive charge and is considered as the absence of a negative charge from an electron.</p> Signup and view all the answers

<p>The presence of holes indicates areas of positive charge, while electrons represent regions of negative charge within a material.</p> Signup and view all the answers

<p>An electron serves as a unit negative charge and facilitates conductivity, while a hole acts as a unit positive charge helping to balance charge flow.</p> Signup and view all the answers

<p>Holes are considered positive because their presence signifies an absence of negatively charged electrons, creating a net positive charge.</p> Signup and view all the answers

<p>The concept of holes contributes by allowing the flow of positive charge, which works alongside electrons to enhance overall charge transport in semiconductors.</p> Signup and view all the answers

<p>Electrons in the conduction band and holes in the valence band.</p> Signup and view all the answers

<p>Electron-hole pairs are generated when energy, such as thermal or light energy, excites electrons from the valence band to the conduction band.</p> Signup and view all the answers

<p>Holes represent the absence of an electron and act as positive charge carriers, contributing to the electrical conductivity.</p> Signup and view all the answers

<p>Recombination occurs when an electron from the conduction band fills a hole in the valence band, effectively eliminating both the electron and the hole.</p> Signup and view all the answers

<p>Increasing temperature provides more energy to electrons, which can lead to a higher generation rate of electron-hole pairs.</p> Signup and view all the answers

<p>They may form pairs, resulting in recombination.</p> Signup and view all the answers

<p>It leads to the release of heat, which can break another covalent bond.</p> Signup and view all the answers

<p>Their random motion allows for encounters that can lead to pair formation.</p> Signup and view all the answers

<p>It can cause the breaking of covalent bonds, potentially altering material properties.</p> Signup and view all the answers

<p>It signifies a loss of free charge carriers and affects the material's electrical characteristics.</p> Signup and view all the answers

<p>P type semiconductors predominantly carry positive charge due to holes.</p> Signup and view all the answers

<p>Boron is a common dopant used to create P type semiconductors.</p> Signup and view all the answers

<p>Holes are the majority carriers, while electrons are the minority carriers in P type semiconductors.</p> Signup and view all the answers

<p>N type semiconductors have electrons as majority carriers and holes as minority carriers.</p> Signup and view all the answers

<p>N type semiconductors have a larger electron concentration than P type semiconductors.</p> Signup and view all the answers