Skip to main content

Questions tagged [charge-carrier]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
1 answer
33 views

How is the number of charge carriers set free in an x-ray detector proportional to the energy of the incoming photon?

I'm a chemistry undergrad student and I've been doing some research into the ways light is generated and detected at different parts of the spectrum (for the purposes of better understanding practical ...
user3499799's user avatar
2 votes
0 answers
118 views

Is it possible to say that entropy would affect the charge transportation?

I noticed there are a few papers from Dr. Karuppuchamy Navamani, for example: Generalization on Entropy-Ruled Charge and Energy Transport for Organic Solids and Biomolecular Aggregates Theoretical ...
Jack's user avatar
  • 47
0 votes
1 answer
36 views

Current Inside the Depletion Region Forward Biased PN Junction

For a forward biased PN junction, we assume the hole and electron currents are constant inside the depletion region when there is no generation or recombination in the depletion region (shown from the ...
Abe 's user avatar
  • 63
0 votes
1 answer
27 views

About the relationship between Hall coefficient and carrier concentration

I had a question while studying the Hall effect. After going through various intermediate processes, the Hall coefficient can be derived as follows, $R_H=\frac{1}{qn},$ where $q$ is the quantity of ...
Newbie's user avatar
  • 1
0 votes
1 answer
36 views

Electric Field Far From PN Junction

According to Semiconductor physics and devices Book by Donald A. Neamen book. The electric field far from the space charge region is very small and most of the applied voltage happens across the space ...
Abe 's user avatar
  • 63
0 votes
1 answer
343 views

Charge density within a PIN diode

Consider the following problem regarding the p-type -intrinsic - n-type (PIN) diode from the Semiconductor Devices fundementals text book: According to the solution manual the charge density is given ...
mathlover123's user avatar
0 votes
1 answer
196 views

How is the number of charge carriers related to the conductivity in semiconductors?

Conductometric gas sensors based on metal oxides (such as this one) use the variation of electrical resistance as an indicator of the concentration of the detected gas. In the aforementioned article, $...
user21390097's user avatar
1 vote
0 answers
81 views

Maxwell's Equations Relativistic Interpretation

I've seen similar questions asking about expressing Maxwell's equations with relativistic formulation, but my question is about the physical interpretation it may give for their conventional form. I'm ...
Lambda's user avatar
  • 233
0 votes
1 answer
43 views

Modeling particles in electric and magnetic fields (software recommendations)

Does anyone know of free software that would allow me to visually model particles moving in electric and magnetic fields, ideally, including magnetic fields extended/altered by ferromagnetic materials?...
SR999's user avatar
  • 23
0 votes
1 answer
75 views

Trajectory of a Charged Particle in a uniform magnetic field in the context of mechanically-enforced sinusoidal motion

I want to find out what would happen to the trajectory of a charged particle, say a proton moving at an angle in a uniform magnetic field if its motion were mechanically altered by a physical barrier. ...
SR999's user avatar
  • 23
3 votes
2 answers
277 views

What is "free charge" in the macroscopic maxwell equations?

Wikipedia states the macroscopic Gauss' law as $\nabla \cdot \overrightarrow{D} = \rho_f$, where $\rho_f$ is the charge density of free charge carriers. I understand that conducting electrons in a ...
Frikandel's user avatar
1 vote
1 answer
295 views

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 ...
MD Hossain's user avatar
1 vote
0 answers
93 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 ...
Cross's user avatar
  • 3,330
1 vote
1 answer
48 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 ...
bob todd's user avatar
0 votes
1 answer
66 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 ...
N. Gin labs's user avatar
0 votes
1 answer
403 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 ...
stratofortress's user avatar
0 votes
0 answers
22 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 ...
Sarah's user avatar
  • 1
1 vote
1 answer
141 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) ...
Abdel Ruvalcaba's user avatar
2 votes
2 answers
406 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 ...
Suraj Kumar's user avatar
1 vote
0 answers
77 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 ...
0 votes
0 answers
53 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 ...
dor00012's user avatar
  • 229
2 votes
1 answer
1k 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 ...
untreated_paramediensis_karnik's user avatar
2 votes
1 answer
2k 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 ...
Tonylb1's user avatar
  • 517
0 votes
1 answer
497 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 ...
danny gotze's user avatar