A5024560087- Dark Matter and Cosmic Phenomena
- Spectroscopy and Quantum Chemical Studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Spacecraft and Cryogenic Technologies
- Advanced Chemical Physics Studies
- Stellar, planetary, and galactic studies
- Organic Electronics and Photovoltaics
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Conducting polymers and applications
- Photochemistry and Electron Transfer Studies
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Ion-surface interactions and analysis
- Molecular Junctions and Nanostructures
- Mass Spectrometry Techniques and Applications
- Astrophysics and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Theoretical and Computational Physics
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Electron and X-Ray Spectroscopy Techniques
Lodz University of Technology
2011-2025
Jagiellonian University
2013-2022
Institute of Physics
2013-2021
ABB (Poland)
2014-2016
Princeton University
2015
University of Łódź
2002-2012
Illinois Institute of Technology
2011
National Institute of Advanced Industrial Science and Technology
2002-2007
Institute of Nuclear Physics, Polish Academy of Sciences
2001
National Institute for Materials Science
1998-2000
This paper deals with the exact extension of original Onsager theory escape probability to case finite recombination rate at nonzero reaction radius. The empirical theories based on Eigen model and Braun model, which are applicable in absence presence an external electric field, respectively, a wrong assumption that both separation processes geminate follow exponential kinetics. accuracies examined against theory. gives is different by factor 3 from one. We have shown this difference can be...
The involvement of charge-transfer (CT) states in the photogeneration and recombination charge carriers has been an important focus study within organic photovoltaic community. In this work, we investigate molecular factors determining mechanism photocurrent generation low-donor-content solar cells, where active layer is composed vacuum-deposited C60 small amounts donor molecules. We find a pronounced decline all parameters with decreasing CT state energy. Using combination steady-state...
A fractional reaction-diffusion equation is derived from a continuous time random walk model when the transport dispersive. The exit encounter distance, which described by algebraic waiting distribution of jump motion, interferes with reaction at distance. Therefore, term has memory effect. applied to geminate recombination problem. shown depend on intrinsic rate, in contrast results Sung et al. [J. Chem. Phys. 116, 2338 (2002)], were obtained where diffusion effect but does not. reactivity...
Electron recombination in highly ionizing stopping protons and deuterons is studied the ArgoNeuT detector. The data are well modeled by either a Birks model or modified form of Box model. dependence on track angle with respect to electric field direction much weaker than predictions Jaffe columnar theory theoretical-computational simulations.
We model charge-carrier hopping transport and electron–hole recombination in realistic amorphous structures of different densities use the obtained results to assess quality lattice models with Gaussian energy disorder, which have been main theoretical tool studies organic semiconductors. find that hopping-site distributions inferred from deviate distribution, especially their low-energy tails. Mostly for this reason, effect disorder on mobility is much weaker than predicted by...
We study the kinetics of recombination reaction in subdiffusive media, where displacement reactants r(t) follows 〈r2(t)〉∝tα with 0<α<1. derive a rigorous fractional reaction–diffusion equation from continuous time random walk model and calculate on basis this equation. The survival probability particle starting at r0 has an asymptotic dependence t−α/2 for both perfectly absorbing partially reflecting boundary conditions. change condition alters only coefficient dependence. is...
Abstract Neutrinos emitted in the carbon, nitrogen, oxygen (CNO) fusion cycle Sun are a sub-dominant, yet crucial component of solar neutrinos whose flux has not been measured yet. The Borexino experiment at Laboratori Nazionali del Gran Sasso (Italy) unique opportunity to detect them directly thanks detector’s radiopurity and precise understanding detector backgrounds. We discuss sensitivity CNO neutrinos, which is based on strategies we adopted constrain rates two most relevant background...
Geminate electron-hole recombination is one of the main factors limiting efficiency organic solar cells. We present a systematic study this process based on both analytical and simulation models. determine how charge-pair separation probability affected by hopping length charge carriers, presence donor-acceptor heterojunction, electron hole mobilities, other factors. show that an which are initially at contact distance maximized when mobilities equal to each other.
We propose a semi-empirical theory which describes the geminate electron-hole separation probability in both homogeneous systems and donor-acceptor heterojunction applicable organic photovoltaics. The is based on results of extensive simulation calculations, were carried out using various lattice models medium different charge-carrier hopping mechanisms, over parameter ranges typical for solar cells. It found that can be conveniently described terms measurable parameters by formula whose...
The kinetic problem of a diffusion-mediated reaction, in which minority reactants are immobile and majority mobile, is known as the target problem. standard theory ignores excluded volume interaction between mobile reactants. Recently, new was proposed where effect analytically investigated using lattice model with prohibited double occupancy sites. results that approximate need verification. In this work, we perform Monte Carlo simulations on lattices use their to assess accuracy analytical...
Specific features of the kinetics geminate reactions assisted by dispersive (subdiffusive) relative motion reacting particles are analysed in detail. The analysis is made for different long-range dependences reactivity k(r) on interparticle distance r: square box, exponential, and inverse power type. obtained analytical solution non-Markovian master equation direct numerical simulation process. reaction shown to be anomalous, namely, significantly from that predicted processes normal...
Geminate electron-hole recombination in organic solids the presence of a donor-acceptor heterojunction is studied by computer simulations. We analyze how charge-pair separation probability such systems affected energetic disorder media, anisotropy charge-carrier mobilities, and other factors. show that energetically disordered effect on stronger than idealized without disorder. also mismatch between electron hole mobilities reduces probability, although this weaker compared to case no...
In this work, we propose a new theoretical approach to modeling the electron−ion recombination processes in ionization tracks liquid argon at 87 K. We developed computer simulation method using realistic models of charge transport and reactions. By introducing concept one-dimensional periodicity track, are able model very large cylindrical structures charged particles. apply our calculate electron escape probability as function initial density track. The results quantitative agreement with...
The dependence of the rate constant electron-ion recombination on external electric field in systems characterized by high electron mobility is calculated means computer simulation. Two simulation methods are proposed, applicable for and low fields, respectively. found to decrease with increasing field, effect becomes stronger as mean free time increases. Results obtained energy space criterion discussed a comparison results experimental data included.
The intrinsic recombination rate in low permittivity materials must be to produce an appreciable dissociation yield. Previously, the electric field-assisted of charge-transfer (CT) complex was studied using Braun's approximate equation. We analyze this process a mathematically strict theory and derive more accurate analytical expression that reduces equation at field strength. Our result is based on assumption that, rate, charge distribution near reaction radius close equilibrium. also study...
In this paper, influence of crowding by inert particles on the geminate reaction kinetics is theoretically investigated. Time evolution equations for survival probability a pair are derived from master equation taking into account correlation among all diffusing particles, and results compared with those obtained Monte Carlo simulations. general, excluded volume interactions slow down diffusive motion reactants. However, when initial concentration uniform high, we show that additional...
The photoluminescence in amorphous semiconductors decays according to power law $t^{-delta}$ at long times. is controlled by dispersive transport of electrons. latter usually characterized the $alpha$ transient current observed time-of-flight experiments. Geminate recombination occurs radiative tunneling which has a distance dependence. In this paper, we formulate ways calculate reaction rates and survival probabilities case carriers execute diffusion with long-range reactivity. method...
This paper presents an analysis of electron-ion recombination processes in ionization tracks recoiled atoms liquid argon (LAr) detectors. The is based on the results computer simulations which use realistic models electron transport and reactions. calculations reproduce recent experimental yield from 6.7 keV nuclear recoils LAr. statistical distribution number electrons that escape found to deviate binomial distribution, estimates fluctuations for are obtained. A study kinetics shows a...
A Monte Carlo simulation was applied to model the electron scavenging processes in radiation-induced spurs low-mobility liquid hydrocarbons. The probabilities were calculated for containing from one ten electron-cation pairs, different initial cation–cation and cation–anion distances, a range of scavenger concentration 10−4 mol/dm3 10−1 mol/dm3. It found that probability decreases as number pairs spur grows. For two-pair is lower by about 20%–30% compared with single-pair value, small five-...
This paper presents a theoretical and computational study of charge-carrier transport in organic solids the presence Gaussian energy disorder. A simulation methodology is developed to calculate equilibrium low-field mobility with high precision irrespective magnitude Using results obtained for several lattice models, we give accurate expressions considered systems, which also relate this quantity its value corresponding system no We discuss dependence on coordination number dimensionality....