Questions tagged [charge-carrier]

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Potential difference between two hollow spheres and amount of current flow

If two Hollow Spheres with radius $r_1$ and $r_2$ have charge $q_1$ and $-q_2$ in them respectively(charges are evenly distributed in the surfaces).The spheres are separated by a distance d .Now We ...
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62 views

Why doesn't the classical model of electrical conduction work with iron, cadmium and bismuth?

My textbook says this: In most metals, the charge carriers are electrons and the charge - carrier density determined from Hall - effect measurements is in good agreement with calculated values for ...
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1answer
42 views

What makes of a current in solidstate/semiconductor physics?

If there is some incoming light that has hit electrons of a N-type doped silicon and broke loose these electrons from their covalent bounds and excited them to the conduction band and also excited the ...
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32 views

Using mass-action law to determine doping densities [closed]

I would like to understand the solution to part c) given below: Find the electron and hole densities in silicon at $300$ K, for each of the following impurity densities: a) Boron atoms at $5 \times ...
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43 views

Carrier density and size of Fermi surface

I think I've heard that a large Fermi surface implies a large carrier concentration and a small Fermi surface implies a small carrier concentration. I am not really sure what the relationship is ...
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18 views

Light or heavy carriers conduct

I want to obtain the 2D carrier density in a n-type FinFET, which depends on the effective mass but I am a bit lost between this two kind of carriers. I have to consider the (DOS) effective mass of ...
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1answer
39 views

In an intrinsic semiconductor, are there the same number of carrier electrons and holes? Or this is just exclusive for silicon?

I am working with some polymers that behave like semiconductors when they are plugged into the current. I am calculating the mobility of these polymers and I need the value of the current density (J) ...
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25 views

Charge carrier density for alloys

If we go to Aschcroft&Mermin we find formula for charge carrier density: $n=\frac{N_AZ\rho_m}{m_a}$ This formula is pretty simple and written in every solid state physics textbook. So my question ...
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25 views

The mechanism behind the second order non-linear injection current

In this paper the mechanism of second order non-linear injection current is defined as Injection currents are produced by quantum interference between different polarization components or between one ...
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2answers
129 views

Semiconductor Physics: Depletion region in PN junction

We know that a depletion region of a PN junction is that region in which there is no free charge carrier i.e. electrons or holes but only contains Ions of positive and negative charge. We know when we ...
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70 views

Where can I learn about a history of holes?

Holes are quasiparticles that were historically brought to explain semiconductor physics with extra benefit of simplifying the counting of electrons.Who gave the first idea and how did it develop ...
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37 views

applied voltage on n-typed semiconductor changes its carrier lifetime

An apparatus was constructed in the lab to measure charge carrier lifetime. An LED illuminates an n-typed germanium semi-conductor with a square function with a constant frequency (the period of the ...
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1answer
673 views

Charge carriers type: contradiction between Hall effect and Seebeck effect, how to resolve it?

On one hand the Hall effect consists of a voltage that arises when an electric field and a perpendicular magnetic field are in a material. This makes the charge carriers (electrons or holes) under the ...
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1answer
1k views

Reverse recovery current of a diode

When the diode is in forward bias phase and suddenly we apply a reverse bias voltage, the diode takes time to be fully blocked because of the excess of minority charges that are stored in P and N ...
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402 views

Intrinsic concentration of charge carriers

In the case of semiconductors the intrinsic charge carrier concentration N, always remains constant. This explains the decrease in number of holes when donor impurities are added to an intrinsic ...