The Experts below are selected from a list of 12744 Experts worldwide ranked by ideXlab platform
Yasin Ramazan Basaran - One of the best experts on this subject based on the ideXlab platform.
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avicenna on the soul s power to Manipulate Material objects
Eskiyeni, 2015Co-Authors: Yasin Ramazan BasaranAbstract:In his article on the foundations of Ficino’s ideas on magic , James Hankins observes that, where Ficino justifies non-Material causation in the universe, he is heavily indebted to Avicenna. As Hankins also points out, this Avicennan idea clearly violates the Aristotelian maxim that ‘physical causation requires contact’. Because Avicenna holds the view that the soul is neither a physical entity nor simply the form of body, Avicenna’s consent to the soul to Manipulate Material objects means assignment of the soul to perform actions upon physical nature. According to Hankins, this consent resorts to a vertical connectivity between physical objects and the human soul. However, we do not see in Hankins’s argument how this connection can occur according to Avicenna and on what grounds Avicenna lets the soul cause changes on Material objects.
Park, So Min - One of the best experts on this subject based on the ideXlab platform.
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EFFECTS OF HOLE TRANSPORTING LAYERS AND SURFACE LIGANDS ON INTERFACE ENERGETICS AND PHOTOVOLTAIC PERFORMANCE OF METHYLAMMONIUM LEAD IODIDE PEROVSKITES
UKnowledge, 2020Co-Authors: Park, So MinAbstract:Organic metal halide perovskites are promising Materials for various optoelectronic device applications such as light emitting diodes (LED) and photovoltaic (PV) cells. Perovskite solar cells (PSCs) have shown dramatic increases in power conversion efficiency over the previous ten years, far exceeding the rate of improvement of all other PV technologies. PSCs have attracted significant attention due to their strong absorbance throughout the visible region, high charge carrier mobilities, color tunability, and ability to make ultralight weight devices. However, organic metal halide perovskites still face several challenges. For example, their environmental stability issue must be overcome to enable widespread commercialization. Meeting this challenge involves Material and interface development and optimization throughout the whole PV device stack. Fundamental understanding of the optical properties, electrical properties, interfacial energetics, and device physics is key to overcome current challenges with PSCs. In this dissertation, we report a new family of triarylaminoethynyl silane molecules as hole transport layers (HTLs), which are in part used to investigate how the PV performance depends on the ionization energy (IE) of the HTL and provide a new and versatile HTL Material platform. We find that triarylaminoethynyl silane HTLs show comparable PV performance to the state-of-the art HTLs and demonstrate that different processing conditions can influence the IE of methylammonium lead iodide (MAPbI3). Surface ligand treatment provides a promising approach to passivate defect states and improve the photoluminescence quantum yield (PLQY), charge-carrier mobilities, Material and device stability, and performance of PSCs. Numerous surface treatments have been applied to perovskite films and shown to passivate defect states and improve the PLQY and performance of PSCs, but it is not clear which surface ligands bind to the surface and to what extent. As surface ligands have the potential to passivate defect states, alter interface energetics, and Manipulate Material and device stability, it is important to understand how different functional groups interact with the surfaces of perovskite films. We investigate a series of ligand binding groups and systematically probe the stability of the bound surface ligands, how they influence energetics, PLQYs, film stability, and PV device performance. We further explore ligand penetration and whether surface ligands prefer to remain on the surface or penetrate into the perovskite. Three variations of tail groups including aryl groups with varying extents of fluorination, bulky groups of varying size, and linear alkyl groups of varying length are examined to probe ligand penetration and the impact on Material stability
Jian Shi - One of the best experts on this subject based on the ideXlab platform.
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nontrivial strength of van der waals epitaxial interaction in soft perovskites
Physical Review Materials, 2018Co-Authors: Yiping Wang, Lei Gao, Y B Yang, Yu Xiang, Zhizhong Chen, Yongqi Dong, Hua Zhou, Zhonghou Cai, G C Wang, Jian ShiAbstract:The van der Waals (vdW) bond is traditionally believed to be orders of magnitude lower than the typical chemical bond (i.e., ionic, metallic, or covalent), and hence the effects caused by a vdW interface are thought to be trivial. In this paper, by investigating the vdW epitaxial growth of a mechanically soft perovskite on the vdW substrate, we obtained the solid proof of strong non-negligible vdW interaction. The experimental results illustrate the formation of cracks and holes for the relaxation of the vdW strain as well as a lattice-constant-dependent epitaxial angle evolution and a pronounced band-structure change. The first-principles calculations indicate that the contribution of the vdW interaction energy at the epitaxial interface reaches up to more than a quarter of the overall interaction energy far exceeding the traditionally recognized vdW bonding strength. Both the experimental and the theoretical work show that given the appropriate Material system, the vdW interaction could be strong enough to significantly Manipulate Material properties.
Yiping Wang - One of the best experts on this subject based on the ideXlab platform.
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nontrivial strength of van der waals epitaxial interaction in soft perovskites
Physical Review Materials, 2018Co-Authors: Yiping Wang, Lei Gao, Y B Yang, Yu Xiang, Zhizhong Chen, Yongqi Dong, Hua Zhou, Zhonghou Cai, G C Wang, Jian ShiAbstract:The van der Waals (vdW) bond is traditionally believed to be orders of magnitude lower than the typical chemical bond (i.e., ionic, metallic, or covalent), and hence the effects caused by a vdW interface are thought to be trivial. In this paper, by investigating the vdW epitaxial growth of a mechanically soft perovskite on the vdW substrate, we obtained the solid proof of strong non-negligible vdW interaction. The experimental results illustrate the formation of cracks and holes for the relaxation of the vdW strain as well as a lattice-constant-dependent epitaxial angle evolution and a pronounced band-structure change. The first-principles calculations indicate that the contribution of the vdW interaction energy at the epitaxial interface reaches up to more than a quarter of the overall interaction energy far exceeding the traditionally recognized vdW bonding strength. Both the experimental and the theoretical work show that given the appropriate Material system, the vdW interaction could be strong enough to significantly Manipulate Material properties.
Zhonghou Cai - One of the best experts on this subject based on the ideXlab platform.
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nontrivial strength of van der waals epitaxial interaction in soft perovskites
Physical Review Materials, 2018Co-Authors: Yiping Wang, Lei Gao, Y B Yang, Yu Xiang, Zhizhong Chen, Yongqi Dong, Hua Zhou, Zhonghou Cai, G C Wang, Jian ShiAbstract:The van der Waals (vdW) bond is traditionally believed to be orders of magnitude lower than the typical chemical bond (i.e., ionic, metallic, or covalent), and hence the effects caused by a vdW interface are thought to be trivial. In this paper, by investigating the vdW epitaxial growth of a mechanically soft perovskite on the vdW substrate, we obtained the solid proof of strong non-negligible vdW interaction. The experimental results illustrate the formation of cracks and holes for the relaxation of the vdW strain as well as a lattice-constant-dependent epitaxial angle evolution and a pronounced band-structure change. The first-principles calculations indicate that the contribution of the vdW interaction energy at the epitaxial interface reaches up to more than a quarter of the overall interaction energy far exceeding the traditionally recognized vdW bonding strength. Both the experimental and the theoretical work show that given the appropriate Material system, the vdW interaction could be strong enough to significantly Manipulate Material properties.