Table of Contents
- 1 What are light and heavy hole?
- 2 Why semiconductors possess heavy holes and light holes in the EK diagrams?
- 3 What is electron effective mass?
- 4 What is the EK diagram?
- 5 What is hole in semiconductor write its characteristics?
- 6 Do holes have mass in semiconductor?
- 7 What is the difference between a heavy hole and light hole?
- 8 What is a hole in a semiconductor?
- 9 Does the valence band of a semiconductor have any structure?
What are light and heavy hole?
Eg= 3,4eV (d) What are light holes and heavy holes? Light hole band has higher/greater slope than heavy hole band resp. light hole band is steeper & heavy hole band flatter and they are located in the valence band and are degenerate bands.
Why semiconductors possess heavy holes and light holes in the EK diagrams?
Why do we have heavy and light hole bands in semiconductors? These holes are strictly the same but they have effective masses that are different. This is caused by the energy bands and momentum k-space effects on effective mass.
Does Hole have mass?
In entirely classical terms, this requires one to move an electron, which has inertia and hence mass. That is, to move the hypothetical hole around, you need to apply a force to the physical electron and do work in the process. Hence the “hole” has mass.
What is electron effective mass?
The effective mass is a quantity that is used to simplify band structures by modeling the behavior of a free particle with that mass. For electrons or electron holes in a solid, the effective mass is usually stated in units of the rest mass of an electron, me (9.11×10−31 kg).
What is the EK diagram?
An E-k diagram shows characteristics of a particular semiconductor material. It shows the relationship between the energy and momentum of available quantum mechanical states for electrons in the material.
What is the shape of the EK diagram of the conduction band and valence band?
The top of the valence band and the bottom of the conduction band are similar parabolic functions. Simplified band structures of insulators, semiconductors, and metals at 0 K. (1).
What is hole in semiconductor write its characteristics?
Hole is a seat of positive charge which is produced when an electron breaks away from a covalent bond in a semiconductor. Hole carries a unit positive charge. 2. It has the same magnitude of charge as that of electron.
Do holes have mass in semiconductor?
Now, in the case of electrons moving through the unfilled valence band, the effective mass is greater than the mass of a mobile electron so hole mass is typically greater than mobile electron mass.
What is the mass of hole in semiconductor?
Originally Answered: Why do holes in a semiconductor have mass? Well, for electron holes in a solid, the effective mass is usually stated as the rest mass of the electron (9.11×10^-31 Kg). Through these holes are not particles, they are quasi particles. Hence they have a mass in accordance with the band theory.
What is the difference between a heavy hole and light hole?
The difference between these particles is that the heavy hole has a projection of its angular momentum equal to ± 3 / 2, while the light hole has a projection equal to ± 1 / 2, of j 1 state
What is a hole in a semiconductor?
The electric charge of hole is equal to electric charge of electron but have opposite polarity.When a small amount of external energy is applied, then the electrons in the valence band moves in to conduction band and leaves a vacancy in valence band. This vacancy is called as hole. Pure semiconductors are called intrinsic semiconductors.
What is the origin of light and heavy hole valence bands?
The light and heavy hole valence bands are formed as a consequence of the spin-orbit angular momentum interaction of the atomic states involved. To explain the origin of light and heavy holes branches. Let us take a Si semiconductor, the corresponding band structure is shown below with spin-orbit interaction.
Does the valence band of a semiconductor have any structure?
On the topic of the valence band of a semiconductor (in this example GaAS), it is the case that the valence band has some structure to it.