Charge transport in the spatially correlated exponential random energy landscape: effect of the non-positive correlation function
Novikov S. V.
Charge transport in amorphous semiconductors having spatially correlated exponential density of states (DOS) has been considered for the arbitrary behavior of the correlation function of random energies. Average carrier velocity is exactly calculated for the quasi-equilibrium (nondispersive) transport regime. For the symmetric exponential DOS with exponential tails for low and high energies and non-positive correlation function the temperature for the transition to the dispersive transport regime depends on correlation properties and becomes greater than the traditional estimation based on the DOS decay energy $kT=U_0$.Another new feature of the transport in the landscape having non-positive correlation function is the decay of the mobility with field in low field region.
Keywords: транспорт носителей зарядаcharge carrier transportexponential density of statesэкспоненциальная плотность состоянийamorphous semiconductorsаморфные полупроводники
Enhanced Bimolecular Recombination of Charge Carriers in Amorphous Organic Semiconductors: Overcoming the Langevin Limit
Novikov S. V., Journal of Physical Chemistry C 2019 Vol. 123 No. 31 P. 18854-18860
We consider the bimolecular charge carrier recombination in amorphous organic semiconductors having a special kind of energetic disorder where energy levels for electrons and holes at a given transport site move in the same direction with the variation of some disorder governing parameter (the parallel disorder). This particular kind of disorder could be found in ...
Added: October 24, 2019
Bimolecular Recombination of Charge Carriers in Polar Amorphous Organic Semiconductors: Eﬀect of Spatial Correlation of the Random Energy Landscape
Novikov S. V., Journal of Physical Chemistry C 2018 Vol. 122 P. 22856-22863
We present a simple model of the bimolecular charge carrier recombination in polar amorphous organic semiconductors in which the dominant part of the energetic disorder is provided by permanent dipoles and show that the recombination rate constant could be much smaller than the corresponding Langevin rate constant. The reason for the strong decrease of the ...
Added: October 15, 2018
Origin of Electric Field Dependence of the Charge Mobility and Spatial Energy Correlations in C60-Based Field Effect Transistors
Fishchuk I. I., Kadasnchuk A., Novikov S. V. et al., Molecular Crystals and Liquid Crystals 2014 Vol. 589 P. 18-28
We report on the inﬂuence of the lateral electric ﬁeld on the charge mobility in organic ﬁeld-effect transistors (OFET) based on C 60 ﬁlms with multigrain morphology. The experimental data were quantitatively described using a recent analytical model by accounting for the strong local electric ﬁelds in a multigrain transistor channel and for the energy ...
Added: March 4, 2015
Novikov S. V., Physical Chemistry Chemical Physics 2020 Vol. 22 No. 3 P. 1174-1180
We consider the two-dimensional bimolecular recombination of charge carriers in amorphous organic semiconductors having the lamellar structure. We calculate the dependence of the eﬀective recombination rate constant on the carrier density taking into account the correlated nature of the energetic disorder typical for organic semiconductors. The resulting recombination kinetics demonstrates a very rich variety of ...
Added: January 22, 2020
Diffusion of a particle in the spatially correlated exponential random energy landscape: Transition from normal to anomalous diffusion
Novikov S.V., Journal of Chemical Physics 2018 Vol. 148 No. 2 P. 024505-1-024505-10
Diffusive transport of a particle in a spatially correlated random energy landscape having exponential
density of states has been considered. We exactly calculate the diffusivity in the nondispersive quasiequilibrium transport regime for the 1D transport model and found that for slow decaying correlation
functions the diffusivity becomes singular at some particular temperature higher than the temperature
of the ...
Added: July 12, 2018
Hopping charge transport in amorphous semiconductors with the spatially correlated exponential density of states
S.V. Novikov, Journal of Chemical Physics 2017 Vol. 146 No. 2 P. 024504-1 -024504-8
Hopping charge transport in amorphous semiconductors having spatially correlated exponential density of states has been considered. Average carrier velocity is exactly calculated for the quasi-equilibrium (nondispersive) transport regime. We suggest also a heuristic approach for the consideration of the carrier velocity for the non-equilibrium dispersive regime. ...
Added: March 22, 2017
Martynov Y., Nazmitdinov R., Moia-Pol A. et al., Physical Chemistry Chemical Physics 2017 Vol. 19 No. 30 P. 19916-19921
Organometal triiodide perovskites are promising, high-performance absorbers in solar cells. Considering the perovskite as a thin film absorber, we solve transport equations and analyse the efficiency of a simple heterojunction configuration as a function of electron–hole diffusion lengths. We found that for a thin film thickness of ~1 micron the maximum efficiency of ~31% could ...
Added: September 29, 2017
Chistyakov A., Zvaigzne M., Nikitenko V. et al., The Journal of Physical Chemistry Letters 2017 Vol. 8 No. 17 P. 4129-4139
Quantum dot (QD) solids represent a new type of condensed matter drawing high fundamental and applied interest. Quantum confinement in individual QDs, combined with macroscopic scale whole materials, leads to novel exciton and charge transfer features that are particularly relevant to optoelectronic applications. This Perspective discusses the structure of semiconductor QD solids, optical and spectral ...
Added: October 7, 2017
A.P. Tyutnev, B.L. Linetskiy, A.V. Nikerov et al., Russian Journal of Physical Chemistry B 2015 Vol. 9 No. 4 P. 648-657
Abstract—A theoretical analysis of the nonlinear field dependence of the pulsed radiationinduced conductiv ity of polystyrene in strong electric fields is performed. An explanation of the previously uncomprehended phe nomenon of the sharp increase in the radiationinduced electrical conductivity in the presence of an electric field with a strength of above 5 × 107 V/m ...
Added: January 18, 2016
Омельченко О. Д., Грибкова О. Л., Тамеев А. Р. et al., Физикохимия поверхности и защита материалов 2014 Т. 50 № 5 С. 512-518
Two techniques of manufacturing a nanocomposite based on a complex of polyaniline with polymer acid and graphene are proposed. The electric conductivity of thin nanocomposite layers is higher than that of a polymer complex of polyaniline and strongly depends on the degree of oxidation of graphene. An explanation of the effect is suggested that takes ...
Added: February 28, 2015
А.П. Тютнев, Б.Л. Линецкий, А.В. Никеров et al., Химическая физика 2015 Т. 34 № 7 С. 58-61
A theoretical analysis of the peculiarities of the nonlinear field dependence of radiation-pulse conductivity of polystyrene in strong electric fields. The explanation of previously misunderstood the rapid increase of the radiation conductivity in electric fields, the intensity of which exceeds 5E7 V/m. this behavior cannot be explained on the basis of the Onsager theory for ...
Added: May 25, 2015
Novikov S. V., Tyutnev A., Schein L. B., Chemical Physics 2012 No. 403 P. 68-73
Using Monte Carlo simulation we investigated time of flight current transients predicted by the dipolar glass model for a random spatial distribution of hopping centers. Behavior of the carrier drift mobility was studied at room temperature over a broad range of electric field and sample thickness. A flat plateau
followed by current decay is the most ...
Added: November 7, 2012
A.P. Tyutnev, V.S. Saenko, Aleshkevich A. et al., Polymer Science - Series A 2017 Vol. 59 No. 4 P. 575-578
Abstract—Transient current curves in a polar molecularly doped polymer for subsurface and bulk generations of charge carriers are compared. No transformation of the horizontal plateau on the former to the curve predicted by the diffusion and drift theory was found, contrary to expectations for quasi-equilibrium transport conditions. This behavior indicates a nonequilibrium character of the ...
Added: June 15, 2017
49601782, Ikhsanov R., 49601816 et al., Journal of Applied Physics 2020 Vol. 128 No. 225501 P. 1-8
Numerical calculations have been performed on the time of flight transients predicted by a newly developed model describing consistently the radiation-induced conductivity of common insulating polymers under both pulsed and continuous irradiation. The model differs substantially from the conventional multiple trapping formalism based on an exponential trap distribution by the presence of additional deep traps distributed in energy ...
Added: December 5, 2020
Charge carrier transport in molecularly doped polycarbonate as a test case for the dipolar glass model
49601782, Novikov S. V., Journal of Chemical Physics 2013 Vol. 138 No. 104120 P. 1-9
We present the results of Monte Carlo simulations of the charge carrier transport in a disordered molecular system containing spatial and energetic disorders using the dipolar glass model. Model parameters of the material were chosen to fit a typical polar organic photoconductor polycarbonate doped with 30% of aromatic hydrazone, whose transport properties are well documented ...
Added: April 3, 2013
The Temperature Dependence and Field Dependence of the Mobility of Charge Carriers in the MultipleTrapping Model with a Gaussian Trap Distribution
A. P. Tyutnev, A. V. Nikerov, V. S. Saenko, et al., Polymer Science - Series A 2015 Vol. 57 No. 1 P. 94-100
Abstract—The multipletrapping model with a Gaussian trap distribution was used for the numerical analysis of the effects of nonequilibrium transport on the temperature dependence and field dependence of the mobility of carriers in a typical molecularly doped polymer. It was shown that, with allowance for the prescribed Poole–Frenkel Frenkel type field dependence of mobility under ...
Added: May 24, 2015
49601782, Ikhsanov R., Novikov S. V., Chemical Physics 2014 Vol. 440 P. 1-7
We have compared time-of-flight curves predicted by hopping and multiple trapping models with the Gaussian and exponential site/trap energy distributions, fitting Monte-Carlo predictions of the former with numerical calculations of the latter in a wide time domain using logarithmic coordinates lg j–lg t for the characterization of current shapes and an estimation of transit times. As a ...
Added: February 28, 2015
Sadovnichii D. N., A.P. Tyutnev, Milekhin Y. M., Russian Chemical Bulletin 2020 No. 9 P. 1607-1613
The modern state of experimental and theoretical studies of the radiation-induced conductivity and charging of polymeric dielectrics under the action of electron beams is considered. The eff ect of the molecular mobility on the transport of excess charge carriers is discussed. ...
Added: December 19, 2020
Antipov A., Seleznev V., Vakhtomin Y. et al., IOP Conference Series: Materials Science and Engineering (MSE) 2020 Vol. 781 No. 1 P. 012011-1-012011-5
Spectral characteristics of WSi and NbN superconducting single-photon detectors with different surface resistance and width of nanowire strips have been investigated in the wavelength range of 1.3-2.5 µm. WSi structures with narrower strips demonstrated better performance for detection of single photons in longer wavelength range. The difference in normalized photon count rate for such structures ...
Added: December 10, 2020
Budkov Y., Kolesnikov A. L., Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159
Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...
Added: November 30, 2018
Kalmykov A., Melentiev P., Balykin V., Laser Physics Letters 2020 Vol. 17 No. 4 P. 045901
In this paper we present measurements and comparison of SPP propagation length at the practically important telecom wavelength (1560 nm) as well as in the near-infrared and visible spectral ranges. The measurements were carried out for plane SPP waves excited on Ag film surface using optical microscopy of SPP waves in the far field. We ...
Added: January 15, 2021
M. : Faculty of Physics, MSU, 2017
The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...
Added: October 1, 2017
Estimation of Intraband and Interband Relative Coupling Constants from Temperature Dependences of the Order Parameter for Two-Gap Superconductors
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019