Poole-Frenkel Conduction in Cu/Nano-SnO₂/Cu Arrangement

Abstract

It is well known that metal/Tin-dioxide/metal sandwich structures exhibit a field-assisted lowering of the potential barrier between donor-like center and the conduction band edge, known as the Poole-Frenkel effect. This behavior is indicated by a linear dependence of Iog on , where is the current density, and is the applied voltage. In this study, the electrical properties of Cu/nano-SnO2/Cu sandwich structures were investigated through current-voltage measurements at room temperature. Also, an attempt to explore the governing current flow mechanism was tried. Our results indicate that noticeable feature appearing clearly in the current-voltage characterization is the Poole-Frenkel and space-charge-limited conduction mechanisms.

Consequence of pH variation on the dielectric properties of Cr-doped lithium ferrite nanoparticles synthesized by the sol–gel method

“…3 (b)] that the electrical conductivity gradually increases with increasing frequency, which is in agreement with Eq. (7) and agrees generally with the behavior of semiconducting materials [21]. This phenomenon can be attributed to two possible mechanisms: (1) the electrical energy associated with the applied AC field helps in the liberation of trapped charges and their transfer between the different localized states, and (2) enhanced dielectric relaxation of the polarization of Li-ferrite nanoparticles occurs in the higher frequency range.…”

“…It is suggested that ε' approaches infinity and M' also approaches infinity, corresponding to M ∞ = 1/ ε ∞ . M' and M" approach zero at low frequency due to the removal of electrical polarization [21]. It is clear that at high frequency interface state cannot follow the AC signal, therefore M' and M" achieve a maximum value.…”

“…2 (a) and (b). The relative, real and imaginary parts of the dielectric constants are represented by the following equations [21].…”

Effects of Iodine Doping on Optoelectronic and Chemical Properties of Polyterpenol Thin Films

“…The general expression for both Schottky and Poole–Frenkel type conductions is [ 40 ]: where J 0 is the low field current density, F the applied electric field, k the Boltzmann constant, T the absolute temperature, β the coefficient of the static electric field, and φ the ionization energy of localized centers and Coulomb barrier height of the electrode polymer interface in the case of Poole–Frenkel and Schottky mechanisms, respectively. The field lowering coefficient β are known as β S and β PF in the case of Schottky and Poole–Frenkel conductions, respectively, and can be expressed as [ 41 ]: where e is the electronic charge, ε 0 the permittivity of free space, ε r the dielectric constant of the bulk polymer material at high frequencies. By comparing theoretical β S and β PF with an experimentally-attained β coefficient, Schottky and Poole–Frenkel mechanisms can be differentiated [ 25 ].…”

Электропроводность монокристаллов твердых растворов GaSe-=SUB=-x-=/SUB=-Te-=SUB=-1-x-=/SUB=- в сильных электрических полях

“…Видно, что между lg σ и √ E существует линейная зависимость. Результаты хорошо описываются теорией термоэлек-тронной ионизации Френкеля [7][8][9][10][11][12][13][14][15][16] где σ (0) -электропроводность в области электриче-ских полей, в которых выполняется закон Ома. В выра-жении (4)…”