hole model - definitie. Wat is hole model
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Wat (wie) is hole model - definitie

CONCEPTUAL AND MATHEMATICAL OPPOSITE OF AN ELECTRON
Electron holes; Hole (quasiparticle); Electron-hole; Hole conduction; Hole theory of electrons; Hole (semiconductor); Hole (electricity)
  • A children's puzzle which illustrates the mobility of holes in an atomic lattice. The tiles are analogous to electrons, while the missing tile ''(lower right corner)'' is analogous to a hole.  Just as the position of the missing tile can be moved to different locations by moving the tiles, a hole in a crystal lattice can move to different positions in the lattice by the motion of the surrounding electrons.
  • effective mass]]. The "filled band" is the semiconductor's [[valence band]]; it curves downward indicating negative effective mass.

hole model      
<electronics> A model of semiconductor behaviour in which donors contribute a positive charge equal in magnitude to the charge of an electron, and acceptors contribute space for such a charge within the crystal lattice. Honored by history well before electrons were discovered and described, much of electronics, especially at the engineering level, continues to consider current as flowing from positive to negative. (1995-10-05)
Black hole cosmology         
COSMOLOGICAL MODEL IN WHICH THE OBSERVABLE UNIVERSE IS THE INTERIOR OF A BLACK HOLE
Schwarzschild cosmology; Black-hole cosmological model; Black-hole cosmology
A black hole cosmology (also called Schwarzschild cosmology or black hole cosmological model) is a cosmological model in which the observable universe is the interior of a black hole. Such models were originally proposed by theoretical physicist Raj Pathria, and concurrently by mathematician I.
Nonsingular black hole models         
A nonsingular black hole model is a mathematical theory of black holes that avoids certain theoretical problems with the standard black hole model, including information loss and the unobservable nature of the black hole event horizon.

Wikipedia

Electron hole

In physics, chemistry, and electronic engineering, an electron hole (often simply called a hole) is a quasiparticle denoting the lack of an electron at a position where one could exist in an atom or atomic lattice. Since in a normal atom or crystal lattice the negative charge of the electrons is balanced by the positive charge of the atomic nuclei, the absence of an electron leaves a net positive charge at the hole's location.

Holes in a metal or semiconductor crystal lattice can move through the lattice as electrons can, and act similarly to positively-charged particles. They play an important role in the operation of semiconductor devices such as transistors, diodes and integrated circuits. If an electron is excited into a higher state it leaves a hole in its old state. This meaning is used in Auger electron spectroscopy (and other x-ray techniques), in computational chemistry, and to explain the low electron-electron scattering-rate in crystals (metals and semiconductors). Although they act like elementary particles, holes are rather quasiparticles; they are different from the positron, which is the antiparticle of the electron. (See also Dirac sea.)

In crystals, electronic band structure calculations lead to an effective mass for the electrons that is typically negative at the top of a band. The negative mass is an unintuitive concept, and in these situations, a more familiar picture is found by considering a positive charge with a positive mass.