# Semiconductor - how to find k and energy of electron, hole

• Ags Ivana
In summary, the value of k for a semiconductor can be calculated using an equation involving the wavelength of the photon absorbed. The energy of an electron in a semiconductor can be calculated using a different equation involving Planck's constant, wave vector, and effective mass. Holes in a semiconductor typically have lower energy than electrons due to their nature as vacancies in the valence band. The energy of an electron in a semiconductor can be influenced by various factors, such as semiconductor material, impurities, and external factors. The energy gap of a semiconductor can be determined experimentally by measuring the energy required to excite an electron from the valence band to the conduction band.
Ags Ivana

## Homework Statement

This is what the question looks like and I don't even have an idea where to begin since we didn't really cover this during lectures.

## Homework Equations

This is all I have from my notes:

also I found that Eg=Ec-Ev

Any help appreciated
Thanks

Ags Ivana said:

## Homework Statement

View attachment 110046
View attachment 110047
This is what the question looks like and I don't even have an idea where to begin since we didn't really cover this during lectures.

## Homework Equations

This is all I have from my notes:
View attachment 110049
View attachment 110048
also I found that Eg=Ec-Ev

Any help appreciated
Thanks

## 1. How do you calculate the value of k for a semiconductor?

The value of k for a semiconductor can be calculated using the equation k = (2π/λ)^2, where λ is the wavelength of the photon absorbed by the semiconductor.

## 2. What is the energy of an electron in a semiconductor?

The energy of an electron in a semiconductor can be calculated using the equation E = (h^2*k^2)/(2m), where h is Planck's constant, k is the wave vector, and m is the effective mass of the electron in the semiconductor.

## 3. How does the energy of a hole differ from that of an electron in a semiconductor?

The energy of a hole in a semiconductor is typically lower than that of an electron. This is because holes are essentially vacancies in the valence band, and therefore have less energy compared to an electron in the conduction band.

## 4. What factors affect the energy of an electron in a semiconductor?

The energy of an electron in a semiconductor can be affected by various factors such as the type of semiconductor material, the presence of impurities, and external influences such as temperature and electric field.

## 5. How can the energy gap of a semiconductor be determined?

The energy gap of a semiconductor can be determined experimentally by measuring the energy required to excite an electron from the valence band to the conduction band. This can be done using techniques such as photoluminescence or absorption spectroscopy.

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