Ionized dopants and quasi-fermi level

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In summary, ionized dopants are crucial in determining the electrical properties of semiconductors by introducing impurities that create extra or missing electrons. This can cause a shift in the quasi-fermi level, which affects the concentration of charge carriers and conductivity. Ionized dopants differ from neutral dopants in their net charge, which impacts how they interact with the semiconductor material. Additionally, ionized dopants can change the bandgap of semiconductors and are often chosen based on their similar atomic structure to the material being doped. Commonly used ionized dopants include boron, phosphorus, arsenic, and antimony.
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Pete99
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Hello all,

I have a question regarding quasi-fermi levels that probably some one can help me to understand.

In a pn junction in equilibrium we can calculate the number of ionized dopants from the distance between the ionization energy of the dopants and the fermi level.

Now, if we apply a voltage, we can in general define two different quasi-fermi level for holes and electrons. How can we calculate the number of ionized dopants now?

Thanks for any help,
 
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Any insight?
 

Related to Ionized dopants and quasi-fermi level

What is the importance of ionized dopants in semiconductors?

Ionized dopants play a crucial role in determining the electrical properties of semiconductors. By introducing impurities into the semiconductor material, they create extra or missing electrons, which can significantly alter the conductivity of the material.

How does ionized doping affect the quasi-fermi level in semiconductors?

Ionized doping can cause a shift in the quasi-fermi level, which is a measure of the energy distribution of electrons in the conduction band and holes in the valence band. This shift can change the concentration of charge carriers and thus impact the conductivity of the semiconductor.

What is the difference between ionized and neutral dopants?

Ionized dopants have either gained or lost an electron, while neutral dopants have no net charge. This difference is essential in determining how the dopants will interact with the semiconductor material and affect its electrical properties.

How do ionized dopants impact the bandgap of semiconductors?

Ionized dopants can change the bandgap of semiconductors by altering the energy levels of the conduction and valence bands. This can impact the absorption and emission of light by the semiconductor, making it useful in optoelectronic devices.

What are some common materials used as ionized dopants in semiconductors?

Some commonly used ionized dopants in semiconductors include boron, phosphorus, arsenic, and antimony. These elements are often chosen because they have a similar atomic structure to the materials they are doping, making it easier to incorporate them into the crystal lattice.

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