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Rok 2023
Rok 2021
Rok 2020
  • A simple model of the trap-assisted recombination with the excitonic Auger mechanism

    We present a simple model of the trap-assisted recombination combined with the excitonic Auger mechanism. It has been shown that only six independent transitions of electrons and holes should be taken into account to describe a combination of the Shockley–Read–Hall (SRH) recombination with this excitonic process. This is in opposition to a well-known model of the SRH mechanism with the free carriers Auger effect via deep states,...

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  • Effect of Different Bromine Sources on the Dual Cation Mixed Halide Perovskite Solar Cells
    Publikacja

    - ACS Applied Energy Materials - Rok 2020

    Recent research has shown that perovskite solar cells with a mixed dual A-cation have much better structural stability without loss of efficiency than single cation devices. Mixed cation perovskites create a lot of questions about the salts being used for the formation of the best-quality layer. Here, we have investigated three sources of bromide in the perovskite absorption layer, using lead bromide (PbBr2), formamidinium bromide...

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  • Enhanced trap-assisted recombination in organic semiconductors
    Publikacja

    An analytical model to describe the interaction of excitons and charge transfer states with deep traps is formulated for the case of molecular materials. Here, we have considered the influence of a trap-assisted recombination on this phenomenon. The final expression for the effective recombination rate has been derived from the Shockley–Read–Hall theory and kinetic equations which characterize different photophysical processes....

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  • Impact of the trap–assisted recombination in the perovskite solar cells
    Publikacja

    - Rok 2020

    To achieve the highest performance using perovskite solar cells it is necessary to understand all the dominant mechanisms which affect the operation of solar cell. Here, we have investigated the bulk and interface trap–assisted recombination processes in the solar cells with p–i–n architecture. These studies are based on the numerical and experimental methods to get better understanding of these physical processes. The following results...

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  • Role of surface recombination in perovskite solar cells at the interface of HTL/CH3NH3PbI3
    Publikacja

    - Nano Energy - Rok 2020

    In order to achieve the highest performance of organometal trihalide perovskite solar cells, it is required to recognize the dominant mechanisms which play a key role in a perovskite material. In the following studies, we have focused on the interfacial recombination between the hole transporting layer (HTL) and the perovskite CH3NH3PbI3 in solar cell devices with p–i–n architecture. It has been shown that Cu:NiOx : used as HTL...

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Rok 2019
Rok 2018
Rok 2017
Rok 2016
Rok 2015
Rok 2014
  • Analysis of higher recombination orders in organic bulk heterojunction solar cells
    Publikacja

    - Rok 2014

    Recently, it has been experimentally demonstrated that an order of nongeminate recombination exceeds two in some types of organic bulk heterojunction donor-acceptor structures. This result is different than for the case of bimolecular recombination described by Langevin theory. Although several theoretical explanations of this effect have been presented, the origin of higher recombination orders is still questionable. In this work,...

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  • High order of nongeminate recombination in organic bulk heterojunction solar cells

    We analyze high order of nongeminate recombination in organic donor–acceptor bulk heterojunction solar cells. The model of recombination where an exciton annihilates on an electron–hole Langevin bound pair near donor–acceptor interface has been applied in our studies. We obtained satisfactory agreement between experimental results and theoretical calculations for the concentration dependences of several parameters characterizing...

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  • Influence of dipoles on the recombination in organic photovoltaic devices
    Publikacja

    - Rok 2014

    Although organic compounds are promising materials to use them in photovoltaic devices, the efficiencies of organic solar cells are still lower in comparison to inorganic photocells. The recombination of charge carriers leads to the loss of photocurrent, therefore a detailed theoretical description of this process is required. In the present work, an influence of interface dipoles on the recombination process is discussed. We show...

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Rok 2013
  • Dendron to Central Core S1–S1 and S2–Sn (n>1) Energy Transfers in Artificial Special Pairs Containing Dendrimers with Limited Numbers of Conformations
    Publikacja
    • P. D. Harvey
    • F. Bregier
    • S. M. Aly
    • J. Szmytkowski
    • M. Paige
    • R. P. Steer

    - CHEMISTRY-A EUROPEAN JOURNAL - Rok 2013

    Two dendrimers consisting of a cofacial free-base bisporphyrin held by a biphenylene spacer and functionalized with 4-benzeneoxomethane (5-(4-benzene)tri-10,15,20-(4-n-octylbenzene)zinc(II)porphyrin) using either five or six of the six available meso-positions, have been synthesized and characterized as models for the antenna effect in Photosystems I and II. The presence of the short linkers, -CH2O-, and long C8H17 soluble side...

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  • Four-body recombination in organic bulk heterojunction solar cells: an alternative interpretation

    We demonstrate a new interpretation of the previously reported quadrimolecular recombination in organic bulk heterojunction solar cells. It is suggested that the recently described (Szmytkowski 2012 Phys. Status Solidi RRL 6 300) interaction between exciton and electron–hole Langevin bound pair formed across the donor–acceptor interface is a four-particle process. This is in opposition to the treatment of this effect as a three-particle...

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  • Photophysics of Soret-Excited Tin(IV) Porphyrins in Solution
    Publikacja
    • K. P. Ghiggino
    • N. K. Giri
    • J. Hanrieder
    • J. D. Martell
    • J. Muller
    • M. F. Paige
    • B. Robotham
    • J. Szmytkowski
    • R. P. Steer

    - JOURNAL OF PHYSICAL CHEMISTRY A - Rok 2013

    The photophysics of low-chlorin tin(IV) tetraphenylporphyrin dihydroxide, a core building block for axially substituted supramolecular tin porphyrin constructs, has been studied in a variety of hydrogen-bonding, nonpolar, and aprotic polar solvents using steady-state, nanosecond, and femtosecond time-resolved emission, and femtosecond time-resolved absorption methods. In hydrogen-bonding solvents the metalloporphyrin exists as...

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  • π-Conjugated Donor-acceptor Polyelectrolytes: Toward Artificial Photosynthesis
    Publikacja
    • L. Estrada
    • E. Puodziukynaite
    • C. Richard
    • T. Pho
    • D. (. Patel
    • L. Wang
    • J. Szmytkowski
    • F. Feng
    • Y. Ohnishi
    • S. Hirata... i 4 innych

    - Rok 2013

    Great advances have been made in the development of conjugated polyelectrolytes (CPEs), which provide tunable properties including water solubility and processability, main-chain exciton and charge transport, variable energy light absorption and fluorescence, non-covalent interactions, and formation of tertiary structures via self-assembly.[1] These characteristics allow CPEs to be considered for use in various optoelectronic applications,...

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Rok 2012
Rok 2011
  • Highly linear self-assembled porphyrin wires
    Publikacja
    • M. Koepf
    • J. Conradt
    • J. Szmytkowski
    • J. A. Wytko
    • L. Allouche
    • H. Kalt
    • T. S. Balaban
    • J. Weiss

    - INORGANIC CHEMISTRY - Rok 2011

    An efficient noncovalent assembly process involving high geometrical control was applied to a linear bis(imidazolyl zinc porphyrin) 7Zn, bearing C18 substitutents, to generate linear multiporphyrin wires. The association process is based on imidazole recognition within the cavity of the phenanthroline-strapped zinc porphyrin. In chlorinated solvents, discrete soluble oligomers were obtained after (7Zn)n was end-capped with a terminal...

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  • On the tendency of temperature and electric field dependences of interface recombination in P3HT:PCBM organic bulk heterojunction solar cells

    We demonstrate theoretical explanation of the temperature and electric field dependences of recombination coefficients in an organic P3HT:PCBM bulk heterojunction solar cell. Based onthe model of interface recombination, two analytical formulas describing the relative ratio of the interface (γI ) to the Langevin (γL) recombination coefficients have been derived. Our analysis indicates that the sign of parameters φT and φF determines...

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  • Photophysics and Halide Quenching of Soret-excited ZnTPPS4- in Aqueous Media
    Publikacja
    • J. Szmytkowski
    • S. M. Brunet
    • U. Tripathy
    • J. A. O'Brien
    • M. F. Paige
    • R. P. Steer

    - CHEMICAL PHYSICS LETTERS - Rok 2011

    Steady state S2-S0 and S1-S0 absorption and emission spectra and picosecond S2 decay and S1 fluorescence rise times have been measured for the model porphyrin ZnTPPS4− in water and in aqueous iodide solutions of constant ionic strength. The dynamics of S1 quenching by iodide are well-modeled by a Stern-Volmer mechanism yielding kQ = 1.75 × 109 M−1 s−1. The S2 state is quenched on a ps time scale by a static electron-transfer mechanism...

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  • Photophysics of Untethered ZnTPP-Fullerene Complexes in Solution
    Publikacja
    • S. K. Sugunan
    • B. Robotham
    • R. P. Sloan
    • J. Szmytkowski
    • K. P. Ghiggino
    • M. F. Paige
    • R. P. Steer

    - JOURNAL OF PHYSICAL CHEMISTRY A - Rok 2011

    The spectroscopy and dynamic behavior of the self-assembled, Soret-excited zinc tetraphenylporphyrin (ZnTPP) plus fullerene (C60) model system in solution has been examined using steady state fluorescence quenching, nanosecond time-correlated single photon counting, picosecond fluorescence upconversion, and picosecond transient absorption methods. Evidence of ground state complexation is presented. Steady-state quenching of the...

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  • Self-assemblies of novel magnesium porphyrins mimicking natural chlorosomal bacteriochlorophylls
    Publikacja
    • J. Szmytkowski
    • J. Conradt
    • H. Kuhn
    • C. M. Reddy
    • M. C. Balaban
    • T. S. Balaban
    • H. Kalt

    - Journal of Physical Chemistry C - Rok 2011

    Self-assembling porphyrins are promising materials to mimic natural bacteriochlorophylls c, d, or e encountered in the chlorosomes of photosynthetic bacteria. We have studied four novel magnesium porphyrins mimicking this chlorosomal antenna system. In contrast to previous articles reporting synthetic Zn-porphyrins, our studies focus on porphyrins with Mg as the central atom, which mimic more closely the natural bacteriochlorophylls....

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Rok 2010
Rok 2009
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Rok 2005
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Rok 2002

wyświetlono 2520 razy