Energy Band Diagram: Questions Answered

In summary, the conversation is about a problem in material science class involving an electron and a hole with different potential and kinetic energies. The electron has a potential energy of 1eV and kinetic energy of 0.2eV, while the hole has a potential energy of 0.1eV and its increasing energy is represented by the upward direction on the vertical axis. The person is unsure of their answers and needs help with understanding what to do when the particle is below the Ev.
  • #1
HenzNett
6
0
hi guys, i came across this problem in my material science class.
can anyone help me with this problem?
thanks!

** (-> an electron)
Ec ___________________________ }-> 0.2eV, from Ec to electron Ec - Ev = 1eV

Ev ____________________________

* (-> a hole) }-> 0.1eV, from hole to Ev

--------> xOR, for a better post of the problem, please see attachment.1. what's the potential energy of the electron?
2. what's the kinetic energy of the electron?
3. what's the potential energy of the hole?
4. what's the kinetic energy of the hole?
5.the vertical axis is energy, meaning the electron energy. what direction represents increasing hole energy, up or down?
I'm guessing the potential energy for electron is 1eV, or the bandgap energy, and the kinetic energy of the electron is 0.2eV. And for 5, the increasing hole energy is probably in the upward direction. But I can't be sure about my answers, and I don't know what to do when the particle is below the Ev. Please help! Thanks again!
 

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  • #2
please help!
 

1. What is an energy band diagram?

An energy band diagram is a visual representation of the energy levels of electrons in a material. It shows the relationship between the energy of the electrons and the potential energy of the material they are in.

2. How is an energy band diagram useful?

An energy band diagram can be used to understand the electrical and physical properties of a material, such as its conductivity, band gap, and optical properties. It can also help in designing electronic devices and predicting their performance.

3. What are the different types of energy bands in a material?

There are two main types of energy bands in a material: the valence band and the conduction band. The valence band is the energy level where the outermost electrons of an atom reside, while the conduction band is the energy level where electrons can move freely and conduct electricity.

4. How is the band gap represented in an energy band diagram?

The band gap, also known as the energy gap, is the energy difference between the valence band and the conduction band. In an energy band diagram, it is represented by the vertical distance between these two bands.

5. What factors can affect the energy band diagram of a material?

The energy band diagram of a material can be affected by various factors such as temperature, doping, and external electric fields. These factors can alter the energy levels and band gap of the material, thus changing its electrical and optical properties.

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