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exciton
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What are thermally generated electrons and holes?
In any semiconductor (doped or not) vibrations of the atoms in the crystal can sometimes knock electrons out of the atom's valence band into the conduction band. When this happens the electron now in the conduction band is added to the population of electrons in the semiconductor, while the void it left behind in the valence band is added to the population of holes in the semiconductor. As the vibrations that cause this generation of electron and hole pairs are usually thermal (although there are other causes too) they are usually called thermally generated electrons and holes.Since the electron and hole pair are in close proximity when formed, many of them recombine before they could be separated by an electric field in the crystal or by simple diffusion.There is of course a somewhat more complicated (but also more correct) explanation using Quantum Mechanics, but the above is sufficient to understand it at the first approximationlevel.
What is the name when two stars are bound together gravitationally and orbit a common center of gravity?
The stars are said to be a "gravitational binary pair"
What are the unique factor pairs of 36?
factor pair = 36,1 factor pair = 18,2 factor pair = 12,3 factor pair = 9,4 factor pair = 6,6
Why should some form of heat sink be used when soldering a rectifier in place?
The rectifier, actually any semiconductor, is heat sensitive. You must use a low wattage soldering iron and a heat sink, such as a pair of pliers clamped around the wire between the connection and the diode, to dissipate the heat. You must also make the connection as quickly as possible.
Is 71 a factor pair?
With the possible exception of a pair of pants or a pair of scissors. 71 is a single number. 7 and 1 is a factor pair of 7.
What type of electron pair exists in a semiconductor?
homopolarsanjay
Which configurations would form a bent molecule?
A molecule with two bound atoms and one line electron pair
Which of the following configurations would form a bent molecule?
a molecule with two bound atoms and one lone electron pair -apex
What are thermally generated electrons and holes?
In any semiconductor (doped or not) vibrations of the atoms in the crystal can sometimes knock electrons out of the atom's valence band into the conduction band. When this happens the electron now in the conduction band is added to the population of electrons in the semiconductor, while the void it left behind in the valence band is added to the population of holes in the semiconductor. As the vibrations that cause this generation of electron and hole pairs are usually thermal (although there are other causes too) they are usually called thermally generated electrons and holes.Since the electron and hole pair are in close proximity when formed, many of them recombine before they could be separated by an electric field in the crystal or by simple diffusion.There is of course a somewhat more complicated (but also more correct) explanation using Quantum Mechanics, but the above is sufficient to understand it at the first approximationlevel.
What roles do free electrons and holes play in intrinsic semiconductor?
Free electrons and holes are the charge carriers-not only in intrinsic semiconductors(these are the purest form of semiconductors-typically as pure as can be made available with the present technology) but also in extrinsic semiconductors(doped semiconductors).In intrinsic semiconductors,electron-hole pairs are created due to the natural processes like-absorption of heat energy from the surroundingsabsorption of energy from photons.this absorbed energy results in breakdown ofcovalant bonds in intrinsic semiconductors as a result of which electron-hole pairs are created.It is this electron hole pair which is responsible for carrying the current through the intrinsic semiconductor when a potential difference is applied across it.In extrinsic semiconductor the case is slightly different-here, we have-majority charge carriers and minority charge carriers.in an n-type semiconductor-majority charge carriers are the electrons contributed by the pentavalent impurities while the minority charge carriers are the holes which are generated as electron-hole pairs due to natural processes discussed above.in p-type semiconductor-majority charge carriers are the holes contributed by trivalent impuritieswhereas the minority charge carriers are the electronswhich are generated as electron-hole pairs due to natural processes discussed above.these are the majority charge carriers which contribute heavily in the flow of current through the extrinsic semiconductors than the minority charge carriers.I suggest you to please go through mass action law and law of electrical neutrality of semiconductors for better understanding.
Do acids accept a pair of electrons?
according to Lewis theory acids act as electron pair acceptors bases act as electron pair donors
What is the difference between lone pair and bonding pair electron?
they are the same. Lone pair is unshared pair of electrons and bond pair is shared pair of electron.
What is the electron pair geometry for CS2?
The electron pair geometry for CS2 is Linear.
Can acids donate an electron pair?
No, by the Lewis definition they accept an electron pair.
Diffirences of bonded and lone pair electron?
The difference between bonded and lone pair is that a bond pair is composed of two electron that are in a bond whereas lone pair is composed of two electron that is not a bond.
Scientists described a base as a compound that donates an electron pair?
The Lewis Theory describes a base as a compound that donates an electron pair. By donating the electron pair there is a covalent bond.
What is the Lewis acids-base theory?
acid: electron pair acceptor Base: electron pair donor
