Questions tagged [semiconductor-physics]
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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Quasi-fermi levels in a solar cell?
I was wondering, if my fermi levels splits up due to n and p type doping into two fermi levels, one for the p type one for the n type, and now due to light radiation my fermi levels split up into 2 ...
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Potential drop across PN junction diode in forward bias
If a PN junction diode is connected to a battery, the P part must have a higher potential than the N part(because these points are connected to the battery) and so there should be a potential drop ...
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Why defects don't have an effective charge in metals?
In semiconductors and insulators, crystal defects, e.g., vacancies and interstitials, are treated as having an effective charge. In metals, however, defects are treated as neutral. I can expect that ...
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Drift current and diffusion current in depletion region of diode at equilibrium
The diffusion current for a diode at the edge of the depletion region is $I_D=I_S(e^{qV_A/VT}-1)$. Under an unbiased condition$(V_A=0)$ at equilibrium, $I_D$ will be $0$. The drift current should be ...
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Does doping affect the number of band states?
Does doping a semiconductor with acceptor impurities affect the number of states in the valence and conduction bands? How about doping with donor impurities?
It seems to me, that in the former case ...
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A question related to shift in the Fermi energy [closed]
If the effective mass of holes in a semiconductor is 5 times that of the electron, at what temperature would the Fermi level shift by 15% from the middle of the forbidden energy band? (given that, eg =...
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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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Thermal Smearing in Josephson Junction
I'm basically trying to simulate a josephson junction at a particular temperature. As per some of the plots I could find, the rise in temperature leads to a rounding of the I - V curve. I was ...
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Neutron damage in HPGe detectors (or any semiconductor)
From what I understand, neutrons hitting a high purity germanium (HPGe) detector will cause damage to it by displacing atoms from the lattice, thus creating vacancies which become a trap for charge ...
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Why do some metal oxides behave as n-type or p-type extrinsic semiconductors without adding a dopant?
There are some metal oxides that are said to be extrinsic n-type and p-type semiconductors without having been doped. For example, $\mathrm{In_2O_3}$, $\mathrm{SnO_2}$ and $\mathrm{ZnO}$ are said to ...
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Fermi level of a semiconductor
When calculating the career concentrations in the conduction band of a intrinsic semiconductor we consider the integral $\int_{E_c}^\infty g_C(E)f_{FD}(E,T)dE$ where $g_c$ is the density of states in ...
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Using Jacobi Method for Solving Full Semiconductor Equations
I am looking to perform modeling of a MOSFET device and have therefore been researching computational methods for how to do so. Quite often when solving the Poisson equation, the reader is pointed to ...
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Why n+ contact of p type Ge is 700um thick compared to p+ contact of n type Ge only 0.3um?
Whether the reason is as follows?
Predominantly HPGe is p type. So compensation of large p type impurity requires more n+ contact. (700um)
But n type Ge is made by doping of excess addition of n type ...
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Books on semiconductor quantum dots
Can someone recommend some good books on semiconductor quantum dots (InGaAs, GaAs etc..) for beginners? I mostly want to learn about the optical states (the photoluminescence) and the optical ...
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Electron-hole pair recombination
Please I will like to know if a reasonable amount of heat can be generated upon the recombination of an electron-hole pair in a photo-excited semiconductor nanoparticle (such as TiO2, CeO2).
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