Polaron


Also found in: Dictionary, Wikipedia.

Polaron

The object that results when an electron in the conduction band of a crystalline insulator or semiconductor polarizes or otherwise deforms the lattice in its vicinity. The polaron comprises the electron plus its surrounding lattice deformation. (Polarons can also be formed from holes in the valence band.) If the deformation extends over many lattice sites, the polaron is “large,” and the lattice can be treated as a continuum. Charge carriers inducing strongly localized lattice distortions form “small” polarons. See Band theory of solids, Hole states in solids, Semiconductor

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Polaron

 

an electron moving through a crystal together with the lattice distortion caused by the electron. The concept was introduced by the Soviet physicist S. I. Pekar. The polaron is a compound quasiparticle and consists of the electron with its associated phonons. The introduction of the polaron permits certain properties of dielectrics and semiconductors to be explained.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

polaron

[′pō·lə‚rän]
(solid-state physics)
An electron in a crystal lattice together with a cloud of phonons that result from the deformation of the lattice produced by the interaction of the electron with ions or atoms in the lattice.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Moreover, the Group has also announced that it has entered into a memorandum of understanding ("MOU") with Polaron Solartech Corp.
The values for Ti[O.sup.2] given in [42] vary from 0.17-0.25 eV for adiabatic polaron transfer to 0.55-0.62 eV for non-adiabatic cases.
This behavior is enhanced by introducing Cu2+ ions by the hopping mechanism of small polarons through different valence states of such a TM.
Study of polaron transport mechanisms in two transition metal ions doped borophosphate glasses.
The spectrum is close to the spectrum excited with the 633 nm line; significant changes can be observed only in the group of bands connected with C~[N.sup.+*] stretching vibrations, where a band at 1377 [cm.sup.-1] connected with semiquinonoid rings with lower polaron delocalization can be observed in addition to the delocalized polaron band at 1335 [cm.sup.-1].
The peak on 1230 [cm.sup.-1] is caused by the polaron formation on PANI structure.
Three characteristic absorption bands are observed in the spectra of pani at 269 nm, 368 nm and 618nm wavelength, n-Alpani composite had absorption peaks at 270 nm, 371 nm and 633nm which are attributed to [pi] -[[pi].sup.*]conjugated ring systems, polaron -[[pi].sup.*] and [pi]-polaron benzenoid to quinoid excitonic transition respectively.
conductivity changing to the relation [sigma] indicate the increase of conductivity due to the increasing polarons concentration, value of exponent S was found and values was in range (0.0536-0.579),these value indicated hoping process that's mean (polaron hoping between polymer chains).
The mediation of Coulomb forces by transverse photons can be understood by analogy with the polaron problem of Solid State Physics.
Spohn [2] investigates the upper and lower bound of the effective mass of the polaron model from a functional integral point of view.
In the case of a disordered polymer, fullerene solar cell systems, the distance between electron and hole within the exciton or polaron pair is known not to be constant throughout the device [124].
Triplet formation by non-geminate charge recombination of free-charge carriers that are created in ~0.2 ps implies the intermediacy of bound electron hole pairs (also called polaron pairs).