The Experts below are selected from a list of 96729 Experts worldwide ranked by ideXlab platform
Yongfang Li - One of the best experts on this subject based on the ideXlab platform.
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reconfiguration of interfacial energy band structure for high performance inverted structure perovskite solar cells
Nature Communications, 2019Co-Authors: Moyao Zhang, Yaowen Li, Yongfang Li, Liwei Chen, Yu Zhan, Qi Chen, Jin Yang, Cheng WangAbstract:Charged defects at the Surface of the organic–inorganic perovskite active layer are detrimental to solar cells due to exacerbated charge carrier recombination. Here we show that Charged Surface defects can be benign after passivation and further exploited for reconfiguration of interfacial energy band structure. Based on the electrostatic interaction between oppositely Charged ions, Lewis-acid-featured fullerene skeleton after iodide ionization (PCBB-3N-3I) not only efficiently passivates positively Charged Surface defects but also assembles on top of the perovskite active layer with preferred orientation. Consequently, PCBB-3N-3I with a strong molecular electric dipole forms a dipole interlayer to reconfigure interfacial energy band structure, leading to enhanced built-in potential and charge collection. As a result, inverted structure planar heterojunction perovskite solar cells exhibit the promising power conversion efficiency of 21.1% and robust ambient stability. This work opens up a new window to boost perovskite solar cells via rational exploitation of Charged defects beyond passivation. Charged Surface defects are expected to undermine the charge extraction in organic-inorganic perovskite solar cells. Here Zhang et al. design ionic fullerene derivatives to not only passivate the Charged defects, but also optimize the interfacial energy due to aligned orientation of the fullerenes.
Liwei Chen - One of the best experts on this subject based on the ideXlab platform.
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reconfiguration of interfacial energy band structure for high performance inverted structure perovskite solar cells
Nature Communications, 2019Co-Authors: Moyao Zhang, Yaowen Li, Yongfang Li, Liwei Chen, Yu Zhan, Qi Chen, Jin Yang, Cheng WangAbstract:Charged defects at the Surface of the organic–inorganic perovskite active layer are detrimental to solar cells due to exacerbated charge carrier recombination. Here we show that Charged Surface defects can be benign after passivation and further exploited for reconfiguration of interfacial energy band structure. Based on the electrostatic interaction between oppositely Charged ions, Lewis-acid-featured fullerene skeleton after iodide ionization (PCBB-3N-3I) not only efficiently passivates positively Charged Surface defects but also assembles on top of the perovskite active layer with preferred orientation. Consequently, PCBB-3N-3I with a strong molecular electric dipole forms a dipole interlayer to reconfigure interfacial energy band structure, leading to enhanced built-in potential and charge collection. As a result, inverted structure planar heterojunction perovskite solar cells exhibit the promising power conversion efficiency of 21.1% and robust ambient stability. This work opens up a new window to boost perovskite solar cells via rational exploitation of Charged defects beyond passivation. Charged Surface defects are expected to undermine the charge extraction in organic-inorganic perovskite solar cells. Here Zhang et al. design ionic fullerene derivatives to not only passivate the Charged defects, but also optimize the interfacial energy due to aligned orientation of the fullerenes.
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reconfiguration of interfacial energy band structure for high performance inverted structure perovskite solar cells
Nature Communications, 2019Co-Authors: Moyao Zhang, Yu Zhan, Qi Chen, Jin Yang, Cheng Wang, Rongming Xue, Junqi Lai, Hongzhen Lin, Jianlin Yao, Liwei ChenAbstract:Charged defects at the Surface of the organic-inorganic perovskite active layer are detrimental to solar cells due to exacerbated charge carrier recombination. Here we show that Charged Surface defects can be benign after passivation and further exploited for reconfiguration of interfacial energy band structure. Based on the electrostatic interaction between oppositely Charged ions, Lewis-acid-featured fullerene skeleton after iodide ionization (PCBB-3N-3I) not only efficiently passivates positively Charged Surface defects but also assembles on top of the perovskite active layer with preferred orientation. Consequently, PCBB-3N-3I with a strong molecular electric dipole forms a dipole interlayer to reconfigure interfacial energy band structure, leading to enhanced built-in potential and charge collection. As a result, inverted structure planar heterojunction perovskite solar cells exhibit the promising power conversion efficiency of 21.1% and robust ambient stability. This work opens up a new window to boost perovskite solar cells via rational exploitation of Charged defects beyond passivation.
Ales Iglic - One of the best experts on this subject based on the ideXlab platform.
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asymmetric size of ions and orientational ordering of water dipoles in electric double layer model an analytical mean field approach
Electrochimica Acta, 2015Co-Authors: Ekaterina Gongadze, Ales IglicAbstract:Abstract Electric double layer is theoretically described within the mean-field approach by taking into account the orientational ordering of water dipoles and asymmetric size of cations and anions. Analytical expressions for the spatial distribution of ions and water dipoles are derived. The effect of asymmetric ionic size on accumulation of counterions and partial depletion of water molecules near the Charged Surface, on spatial dependence of relative permittivity and on differential capacitance of electric double layer are presented.
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decrease of permittivity of an electrolyte solution near a Charged Surface due to saturation and excluded volume effects
Bioelectrochemistry, 2012Co-Authors: Ekaterina Gongadze, Ales IglicAbstract:The dipole moment of a water molecule in liquid water differs from that of an isolated one because each molecule is further polarized by the electric field of its neighbours. In this work a formula for the spatial dependence of the relative permittivity of an electrolyte near a highly Charged Surface is obtained in which the mutual influence of the water molecules is taken into account by means of the cavity field. The orientational ordering of water dipoles is considered in the saturation regime. It is predicted that the relative permittivity of an electrolyte solution near the highly Charged Surface (i.e. in saturation regime) may be substantially decreased due to orientational ordering of water (saturation effect) and depletion of water molecules (excluded volume effect) due to accumulation of counterions.
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langevin poisson boltzmann equation point like ions and water dipoles near a Charged Surface
General Physiology and Biophysics, 2011Co-Authors: Ekaterina Gongadze, Van Rienen U, Ales IglicAbstract:: Water ordering near a Charged membrane Surface is important for many biological processes such as binding of ligands to a membrane or transport of ions across it. In this work, the mean-field Poisson-Boltzmann theory for point-like ions, describing an electrolyte solution in contact with a planar Charged Surface, is modified by including the orientational ordering of water. Water molecules are considered as Langevin dipoles, while the number density of water is assumed to be constant everywhere in the electrolyte solution. It is shown that the dielectric permittivity of an electrolyte close to a Charged Surface is decreased due to the increased orientational ordering of water dipoles. The dielectric permittivity close to the Charged Surface is additionally decreased due to the finite size of ions and dipoles.
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excluded volume effect and orientational ordering near Charged Surface in solution of ions and langevin dipoles
Bioelectrochemistry, 2010Co-Authors: Ales Iglic, Ekaterina Gongadze, Klemen BohincAbstract:Abstract The influence of a finite volume of ions and orientational ordering of water Langevin dipoles on the dielectric permittivity profile in the vicinity of Charged Surface is studied theoretically via a numerical solution of the modified Poisson–Boltzmann equation. It is shown that the dielectric permittivity profile close to the Charged Surface is mainly determined by two mechanisms; specifically, the depletion of dipoles at the Charged Surface due to accumulated counterions and the increased orientational ordering of the water dipoles.
Moyao Zhang - One of the best experts on this subject based on the ideXlab platform.
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reconfiguration of interfacial energy band structure for high performance inverted structure perovskite solar cells
Nature Communications, 2019Co-Authors: Moyao Zhang, Yaowen Li, Yongfang Li, Liwei Chen, Yu Zhan, Qi Chen, Jin Yang, Cheng WangAbstract:Charged defects at the Surface of the organic–inorganic perovskite active layer are detrimental to solar cells due to exacerbated charge carrier recombination. Here we show that Charged Surface defects can be benign after passivation and further exploited for reconfiguration of interfacial energy band structure. Based on the electrostatic interaction between oppositely Charged ions, Lewis-acid-featured fullerene skeleton after iodide ionization (PCBB-3N-3I) not only efficiently passivates positively Charged Surface defects but also assembles on top of the perovskite active layer with preferred orientation. Consequently, PCBB-3N-3I with a strong molecular electric dipole forms a dipole interlayer to reconfigure interfacial energy band structure, leading to enhanced built-in potential and charge collection. As a result, inverted structure planar heterojunction perovskite solar cells exhibit the promising power conversion efficiency of 21.1% and robust ambient stability. This work opens up a new window to boost perovskite solar cells via rational exploitation of Charged defects beyond passivation. Charged Surface defects are expected to undermine the charge extraction in organic-inorganic perovskite solar cells. Here Zhang et al. design ionic fullerene derivatives to not only passivate the Charged defects, but also optimize the interfacial energy due to aligned orientation of the fullerenes.
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reconfiguration of interfacial energy band structure for high performance inverted structure perovskite solar cells
Nature Communications, 2019Co-Authors: Moyao Zhang, Yu Zhan, Qi Chen, Jin Yang, Cheng Wang, Rongming Xue, Junqi Lai, Hongzhen Lin, Jianlin Yao, Liwei ChenAbstract:Charged defects at the Surface of the organic-inorganic perovskite active layer are detrimental to solar cells due to exacerbated charge carrier recombination. Here we show that Charged Surface defects can be benign after passivation and further exploited for reconfiguration of interfacial energy band structure. Based on the electrostatic interaction between oppositely Charged ions, Lewis-acid-featured fullerene skeleton after iodide ionization (PCBB-3N-3I) not only efficiently passivates positively Charged Surface defects but also assembles on top of the perovskite active layer with preferred orientation. Consequently, PCBB-3N-3I with a strong molecular electric dipole forms a dipole interlayer to reconfigure interfacial energy band structure, leading to enhanced built-in potential and charge collection. As a result, inverted structure planar heterojunction perovskite solar cells exhibit the promising power conversion efficiency of 21.1% and robust ambient stability. This work opens up a new window to boost perovskite solar cells via rational exploitation of Charged defects beyond passivation.
Jacob Klein - One of the best experts on this subject based on the ideXlab platform.
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selective adsorption of poly ethylene oxide onto a Charged Surface mediated by alkali metal ions
Langmuir, 2008Co-Authors: Liraz Chai, Nir Kampf, Ronit Goldberg, Jacob KleinAbstract:Using a Surface force balance, we have measured normal and shear interactions between mica Surfaces across pure water and across 0.1 M aqueous solutions of LiNO3, NaNO3, KNO3, and CsNO3, both prior to adding polymer and following addition of 1.5 × 10-4 w/w poly(ethylene oxide) (PEO, Mw = 170 kD) and overnight incubation. Our results reveal that while the PEO adsorbs strongly from the KNO3 and CsNO3 solutions, unexpectedly it does not adsorb at all from the LiNO3 and NaNO3 salt solutions. We attribute this to the different nature of the hydration layers about the alkali metal ions: these favor liganding to the negatively Charged mica Surface of the etheric −O− group on the ethylene oxide monomer for the case of the more weakly hydrated K+ and Cs+, but not for the case of Na+ or Li+ with their more strongly bound water. A simple model relating the electrostatic energy changes occurring upon such liganding to the experimentally measured hydration energies of the different alkali metal ions supports this att...
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selective adsorption of poly ethylene oxide onto a Charged Surface mediated by alkali metal ions
Langmuir, 2008Co-Authors: Liraz Chai, Nir Kampf, Ronit Goldberg, Jacob KleinAbstract:Using a Surface force balance, we have measured normal and shear interactions between mica Surfaces across pure water and across 0.1 M aqueous solutions of LiNO3, NaNO3, KNO3, and CsNO3, both prior to adding polymer and following addition of 1.5 × 10-4 w/w poly(ethylene oxide) (PEO, Mw = 170 kD) and overnight incubation. Our results reveal that while the PEO adsorbs strongly from the KNO3 and CsNO3 solutions, unexpectedly it does not adsorb at all from the LiNO3 and NaNO3 salt solutions. We attribute this to the different nature of the hydration layers about the alkali metal ions: these favor liganding to the negatively Charged mica Surface of the etheric −O− group on the ethylene oxide monomer for the case of the more weakly hydrated K+ and Cs+, but not for the case of Na+ or Li+ with their more strongly bound water. A simple model relating the electrostatic energy changes occurring upon such liganding to the experimentally measured hydration energies of the different alkali metal ions supports this att...