Semiconductor physics is the branch of solid state physics that focuses on specific properties of semiconductors. It studies dynamics of different perturbations (mainly electrons and holes) in the semiconductor crystal and the ways to harness it in electrical circuits.

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How can excite a semiconductor to make a photon just by heat in room temperature?

I want to know if a semiconductor in room temperature can excite by heat, producing photon, without any other source of energy?
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How is it guaranteed that electrical connections could be made without destroying a diode laser?

A diode laser is a tiny diode and requires a microscope to see it. Since a laser generates a good amount of heat, the diode should be destroyed with the produced heat. But it does not happen. but why ...
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Why is carbon not a semiconductor?

As opposed to silicon and germanium (or tin and lead), carbon is not a semiconductor --even though, they are in the same group. More interestingly, diamond (which is carbon) seems to be a good ...
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Relation between interlayer tunneling amplitude and external potential in Bilayer graphene

What is the relation between interlayer tunneling amplitude ($\gamma_1$) and external potential applied ($U_{ext}$)? Is there any mathematical relation?
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21 views

What causes the screening length of metals to be so small? [on hold]

I am currently studying semiconductors and metal junctions. Most of the journals I have come across mention that the screening length of metals is small. As a result, the bands of the metal do not ...
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11 views

Why the bandgap of inorganic semiconductors decreases with temperature?

The temperature dependence of the energy bandgap in inorganic semiconductors is given by $$E_g (T) = E_{g,0} - \frac{\alpha T^2}{T+\beta}$$ where $\alpha, \beta$ are both positive, and the (somewhat ...
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what is the effect of temperature on the resistance of a photoconductor?

As we know, for a photo conductor resistance tends to decrease with increase in irradiance, but with greater irradiance comes greater temperature. Also we know, photo conductors are ...
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30 views

How does negative power lead to amplification?

I am currently investigating semiconductor superlattices and I am analyzing the negative differential velocity (NDV) after a certain limit. I understand how NDV leads to negative power, but I am ...
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3answers
100 views

Why is $np$ always equal to $n_i^2$?

For you guys who studied semiconductor physics must be familiar with the equation: $$np=n_i^2$$ I can understand why this is true for the intrinsic case (the broken bonds would always provide ...
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BEEM and Doping of semiconductors

When using Ballistic electron emission microscopy(BEEM) to Image a metal/Semi-conductor interface would applying n-type doping aide or prevent a BEEM current to be detected as BEEM works on the ...
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Semiconductor physics resonant tunneling diode

What happened if the barrier in resonant tunneling diode is of unequal width?
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Are insulators and conductors arbitrary categories?

I have seen charts showing the transition from insulator to semi-conductor is at $10^{-8}~\frac{\text{S}}{\text{cm}}$ and between semi-conductor and conductor is $10^{3}~\frac{\text{S}}{\text{cm}}$. ...
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Semiconductor nanostructure and heterostructure

What is the difference between compositional superlattice and doping superlattice?
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What is the physical meaning of potential energy in a band diagram of a semiconductor?

According to this slide (from this website), the potential energy of an electron in a semiconductor is defined by the difference between the Energy level of the conduction band and the fermi level. ...
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Is possible to excite semiconductor with attosecond laser pulse [closed]

Is possible to excite semiconductor with attosecond laser pulse for generation THz wave?
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21 views

Depletion region and electric field

Intuitively I think that as the depletion region increases, the electric field should increases due to the large number of ions in depletion region. When I read about zener diodes, it says that ...
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59 views

Can we construct a NOT logic gate without a transistor? [migrated]

Is it possible to build a NOT logic gate using discrete components without using NMOS or PMOS transistors?
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20 views

How Does Silicon Surface Barrier (SSB) radiation detectors work?

I'm dealing whith some old detectors (about 1980) called Silicon Surface Barrier, searching online I've seen that they consist on metal-semiconductor(Si n-type) junction (schottky diode) and in one ...
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63 views

What are the phenomena responsible for irreversible increase in entropy?

https://www.quantamagazine.org/20140416-times-arrow-traced-to-quantum-source This article says that entanglement drives the arrow of time of increasing entropy towards thermodynamic equilibrium: ...
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14 views

Why do ideal Op-Amps have zero offset voltage? [migrated]

Why does ideal operational amplifiers have zero offset voltage? Is that because it has infinite gain?
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25 views

Why can't a reverse biased diode conduct by majority carrier injection?

I know that the question "why can't a reverse biased diode conduct" has been asked before (here and here), but I'm asking it from a bit different perspective. Why can't we inject electrons into the ...
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Problem in resonant tunneling diode (RTD)

What happen if the two barrier width in RTD are not same? How the transmission coefficient change for this? How the dips are formed in the transmission coefficient graph?
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Dopants vs impurities

The question is related to terminology. What is the difference between dopants and impurities in condensed matter (semiconductor) physics?
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Explanation of superlattice

What is the difference between overlap Integral, shift Integral and transfer Integral in superlattice ? Why these terms comes in solving the wave function?
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What dictates the range of EM radiation which can be produced by semi-conductor excitation (like LEDs)

Exciting semiconductors such as silicon carbide and gallium nitride can cause electroluminescence. I believe that by altering the chemistry of the semiconductor, you can alter the wavelength of the ...
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4answers
33 views

What is the potential difference across a disconnected diode? [duplicate]

I think potential difference across disconnected diode should be zero but how? the last graph tells that there is a potential difference between the two ends of a diode. then how can be it zero?
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Does the Schottky Barrier only happen at Metal Semiconductor Interfaces?

Most references that I have come across refer to the Schottky Barrier in the setting of Metal and Semiconductor Interface. Would it be correct to use the term Schottky Barrier to refer to the mismatch ...
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How does a CCD able to differentiate between different colors?

According to Wikipedia, Digital color cameras generally use a Bayer mask over the CCD. Each square of four pixels has one filtered red, one blue, and two green [...]. The result of this is ...
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Superluminescent LED [closed]

How do Superluminescent LED generate amplified spontaneous emission? Moreover," a superluminescent LED combines the spatial coherence of a laser diode and the temporal incoherence of an LED. " Please ...
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Miniband width and Elecron Mobility [closed]

In superlattice, how miniband width and Electron mobility are related? I need detailed qualitative and quantitative description. Thank you.
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Obtaining a Positive Hall Coefficient for Electrons Near the Top of a Valence Band

Using a Drude model of charge carriers with a charge $q$ and a mass $m$ (which I allow to take either sign at this stage) in a sample with an applied electric field $\mathbf{E}$ and magnetic field ...
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35 views

Derivation of Einstein's relation in Drift Diffusion model for Semiconductors

I'm currently reading Semiconductor Devices: Basic Principles by Jasprit Singh. In this book he gives a derivation of the Einstein relation for the Drift Diffusion model of semiconductors, supposing ...
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25 views

How many valence bands does Silicon have?

I can't seem to find a concrete answer anywhere online. I am under the impression there are three valence bands before the energy gap in Silicon? (As opposed to Ge, in which there are 4?) Any help ...
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The width of the space charge region in a pn-junction

Given a pn-junction as in the picture below. Which quantity determines the width of the space charge region? Or in other words, why don't the electrons in the n-doped region wander towards the ...
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23 views

Calculate 2D Effective mass from bulk effective mass

I am trying to create a self consistent Shrodinger Poisson Solver for various semiconductors. There is already one done by Professor Hu from UC Berkeley - QM CV Simulator. Looking at the code, they ...
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18 views

The probability of photoluminescence

Was reading about premeditated doping in semiconductors and the effect it imposes on the emission spectrum, doping as I read introduces defect states which are close to either the valence band edge or ...
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Semiconductors, Solid-State Physics

We know, that conductors, conduct because their valence energy band is "half" full, and k ("wave vector") can increase and therefore the electrons under the influence of a electric field can "move", ...
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electron blocking layer and hole blocking layer

What is basically an electron blocking layer and a hole blocking layer in contrast to an electron transport layer or a hole transport layer? In terms of the bandgap, I think if the case is one of a ...
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Measuring the effective mass

Intro: To avoid any terminology confusion, this is asked in the context of Solid State Physics and semiconductors. The canonical definition given for the effective mass is that it is related to the ...
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3answers
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What happens after an electron and hole combine?

OK so I understand that an LED is a pn junction where when a forward bias is placed across the junction, the electric field causes the electrons to combine with the holes and release a photon through ...
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Electron jump into a transistor to read qubit state

Prof. Andrea Morello, a quantum physicist, in one of its quantum computer models uses the spin of the outermost electron in a phosphorus atom to represent a qubit. This atom is embedded to a ...
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Liquid conductors and conservation [closed]

Would gas or liquid conductors cost less than metal and are they more efficient conductor? Is there a material that would contain a magnetic field and would it increase conductivity? If so, This ...
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What is the meaning of the zero point of the real part of the dielectric function for a semiconductor?

I basically understand the zero point of the real part of the dielectric function for a metal. It generally corresponds to plasmon. For a metal, if the frequency is lower, the real part is negative ...
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P-type semi-conductor: Hole current VS Electron current

In a p-type semiconductor, it is said that the hole current is greater than the electron current, which makes no sense to me.. The hole current is due to the electron current, right? Electrons jump ...
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Calculating the band profile of a complex semiconductor heterostructure

I am an EE undergraduate with a lot of interest in semiconductors. I took an introductory semiconductors course which was helpful but left me with some holes in my understanding, as the course ...
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Are diodes (or FETs) electrets?

The explanations I see of diodes and FETs seem to involve various depletion regions, migration of electrons and holes, and the such. My (perhaps naive) interpretation of these explanations implies ...
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the Fermi level of MOS capacitor

Consider a p type MOS capacitor. As we tune the bias of the device, the fermi level of the body would change. Why do the difference of the fermi level between gate and body is equivalent to gate ...
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1answer
127 views

Density of states for graphene

I have seen a lot of plots for the density of states for graphene: but have been unable to find the calculation explicetely. I know the dispersion relation for graphene is $E_{\pm} (\textbf{k}) ...
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Conductive n-type material in pn junction

I'm interested in this question from the point of view of a solar cell. In a pn junction (example, p: CIGS, n: CdS), when the n-type material is very conductive, why will the junction not be ...
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Why for each electron – hole recombination, an electron from the negative terminal of the battery is released

Why for each electron – hole recombination, an electron from the negative terminal of the battery enters the N-region and then drifts towards the junction?