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- 摘要
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- 实验方案
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Use of Magnetic Fields for Surface Modification of PbI2 Layers to Increase the Performance of Hybrid Perovskite Solar Cells
摘要： Hybrid perovskite ?lms are prepared via two-step spin coating. The impact of magnetic ?elds during the spin coating of the PbI2 precursor solution is assessed with atomic force microscopy and scanning electron microscopy of the obtained layers. Deeper and narrower peak–valley–peak formations are obtained in PbI2 ?lms when the magnetic ?eld applied and the spinning direction result in a Lorentz force that pushes the [PbI6]4? ions towards the inner area of the substrate. This produces rougher and more porous PbI2 ?lms with an increased surface area that facilitates the in?ltration of the methylammonium iodide and chloride precursor solution, thereby enhancing the formation of perovskite. Increased cell performance and more repeatable results are obtained when the PbI2 ?lm is spin-coated under the in?uence of a negative magnetic ?eld. Opposite effects are obtained when the direction of the magnetic ?eld, and therefore the Lorentz force, is inverted. This demonstrates that a magnetic ?eld can be used to modify the surface morphology of spin-coated thin ?lms prepared from ionic precursor solutions.
关键词： solar cells,Hybrid perovskite,assisted deposition,magnetic field,Lorentz force
更新于2025-09-23 15:19:57
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Ultrastable Luminescent Hybrid Bromide Perovskite@MOF Nanocomposites for the Degradation of Organic Pollutants in Water
摘要： Hybrid bromide perovskites (HBPs) have emerged as promising candidate in optoelectronic applications, although instability of the materials under working conditions has retarded the progress towards commercialization. As a rational approach to address this core issue, we herein report the synthesis of a series of ultrastable composite materials, wherein HBP nanocrystals (NCs) have been stabilised within a well-known chemically stable metal-organic framework (MOF) viz. zeolitic imidazolate framework (ZIF-8) via pore-encapsulated solvent directed (PSD) approach. The composites maintain their structural integrity as well as photoluminescence (PL) properties upon dipping into a wide range of polar solvents including water (even in boiling conditions), prolonged exposure to UV irradiation and elevated temperature for longer period of time. Further on the basis of high stability, HBP@MOF composites have been demonstrated as heterogeneous photocatalyst to degrade toxic organic pollutants directly in water.
关键词： photocatalysis,porous coordination polymer,stability of hybrid perovskite,Hybrid bromide perovskite,nanocomposites,luminescence properties
更新于2025-09-19 17:15:36
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Ultrafast and broadband photodetectors based on a perovskite/organic bulk heterojunction for large-dynamic-range imaging
摘要： Organic-inorganic hybrid perovskite (OIHP) photodetectors that simultaneously achieve an ultrafast response and high sensitivity in the near-infrared (NIR) region are prerequisites for expanding current monitoring, imaging, and optical communication capabilities. Herein, we demonstrate photodetectors constructed by OIHP and an organic bulk heterojunction (BHJ) consisting of a low-bandgap nonfullerene and polymer, which achieve broadband response spectra up to 1 μm with a highest external quantum efficiency of approximately 54% at 850 nm, an ultrafast response speed of 5.6 ns and a linear dynamic range (LDR) of 191 dB. High sensitivity, ultrafast speed and a large LDR are preeminent prerequisites for the practical application of photodetectors. Encouragingly, due to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is achieved by employing the OIHP photodetectors. We believe that state-of-the-art OIHP photodetectors can accelerate the translation of solution-processed photodetector applications from the laboratory to the imaging market.
关键词： Organic-inorganic hybrid perovskite,ultrafast response,photodetectors,high-dynamic-range imaging,broadband response,near-infrared
更新于2025-09-19 17:13:59
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[IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Fabrication and Characterization of Organic-Inorganic Hybrid Perovskite CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> Based Metal-Semiconductor-Metal Photodetector
摘要： Organic-inorganic perovskite CH3NH3PbI3 is used for the fabrication of thin film photodetector, which is synthesized via the sol-gel chemical route. The prepared hybrid perovskite CH3NH3PbI3 thin film are characterized by X-ray diffraction (XRD), high resolution scanning electron microscope (HRSEM), photoluminescence. XRD result confirmed the formation of the tetragonal phase of CH3NH3PbI3 with crystallite size 15.7 nm. HRSEM image of hybrid perovskite CH3NH3PbI3 thin film confirmed the uniform distribution of particles and average particle size 30 nm. An efficient photoluminescence band is observed at 1.59 eV in hybrid perovskite CH3NH3PbI3 thin films at ambient temperature when excited with 405 nm wavelength light. Finally, the hybrid perovskite CH3NH3PbI3 thin film is investigated for electrical and optical response using fabricated metal-semiconductor-metal (MSM) photodetector.
关键词： Organic-inorganic hybrid perovskite,Responsivity,Metal-semiconductor-metal,Photodetector
更新于2025-09-19 17:13:59
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Ultralong CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> nanowires synthesized by a ligand-assisted reprecipitation strategy for high-performance photodetectors
摘要： Organic-inorganic hybrid perovskite nanowires with well-defined structures have attracted considerable attention for optoelectronic applications. Perovskite nanowires integrated into practical optoelectronic devices are often hindered by the poor crystalline quality. Herein, a ligand-assisted reprecipitation strategy (LARP) is employed to prepare ultralong and freestanding CH3NH3PbI3 nanowires in large-scale. Oleylamine is adopted as an inhibitor, which can create a passivation layer on the surface of CH3NH3PbI3, to slow down the crystallization rate of CH3NH3PbI3 nanowire. With the low crystallization rate, several millimeters long and high-quality CH3NH3PbI3 nanowires with smooth surfaces can be synthesized in a large scale. Photodetectors fabricated on oleylamine assistant synthesized CH3NH3PbI3 nanowires exhibit high detectivity, which is five times higher than that of none oleylamine assistant synthesized CH3NH3PbI3 nanowires photoanode.
关键词： Organic-inorganic hybrid perovskite,photodetectors,nanowires,ligand-assisted reprecipitation strategy,optoelectronic applications,oleylamine
更新于2025-09-19 17:13:59
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Atomic-level description of the CH3NH3PbI3perovskite solar cell absorber surface
摘要： Methylammonium lead halide CH3NH3PbI3 (MAPI)-based hybrid organic-inorganic perovskite has recently emerged as a promising solar photovoltaic absorber exhibiting an energy conversion efficiency higher than 20 %. An atomic-level description of a clean MAPI surface is a first step to understand its behavior when interfaced with oxides o molecules. Here, we perform classical molecular dynamics simulations of MAPI by using a MYP force field which was derived from ab initio calculations by Mattoni et al. The slab method is applied to model a thin film with two (001) PbI2-terminated surfaces. Temperature evolution of the structural properties are reported, analyzing in particular the changes of the orientations of the MA+cations at the surface and along the growth direction.
关键词： Molecular Dynamics,Solar cell,hybrid perovskite
更新于2025-09-16 10:30:52
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Rooma??Temperature Partial Conversion of ?±a??FAPbI <sub/>3</sub> Perovskite Phase via PbI <sub/>2</sub> Solvation Enables Higha??Performance Solar Cells
摘要： The two-step conversion process consisting of metal halide deposition followed by conversion to hybrid perovskite has been successfully applied toward producing high-quality solar cells of the archetypal MAPbI3 hybrid perovskite, but the conversion of other halide perovskites, such as the lower bandgap FAPbI3, is more challenging and tends to be hampered by the formation of hexagonal nonperovskite polymorph of FAPbI3, requiring Cs addition and/or extensive thermal annealing. Here, an efficient room-temperature conversion route of PbI2 into the α-FAPbI3 perovskite phase without the use of cesium is demonstrated. Using in situ grazing incidence wide-angle X-ray scattering (GIWAXS) and quartz crystal microbalance with dissipation (QCM-D), the conversion behaviors of the PbI2 precursor from its different states are compared. α-FAPbI3 forms spontaneously and efficiently at room temperature from P2 (ordered solvated polymorphs with DMF) without hexagonal phase formation and leads to complete conversion after thermal annealing. The average power conversion efficiency (PCE) of the fabricated solar cells is greatly improved from 16.0(±0.32)% (conversion from annealed PbI2) to 17.23(±0.28)% (from solvated PbI2) with a champion device PCE > 18% due to reduction of carrier recombination rate. This work provides new design rules toward the room-temperature phase transformation and processing of hybrid perovskite films based on FA+ cation without the need for Cs+ or mixed halide formulation.
关键词： FAPbI3,two-step conversion,high performance,hybrid perovskite solar cells,quartz-crystal microbalance,in situ grazing incidence wide angle x-ray scattering
更新于2025-09-16 10:30:52
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Synthesis and characterization of CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> and CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>(3-x)</sub> Cl <sub/>x</sub> perovskite solar cell materials
摘要： The emerging of perovskite solar cell has attracted many interests in the synthesis and characterization of hybrid perovskite materials related to methylammonium iodide (MAI) due to various promising properties. In this work, we found a faster way to synthesize hybrid perovskite CH3NH3PbI3 and CH3NH3PbI(3-x)Clx (x ? 0,1,2) powders from a different solvent in the preparation process of MAI precursor. In addition, it was found that Cl atoms cannot directly substitute for I in CH3NH3PbI(3-x)Clx powders, as characterized by XRD and XAS, with a solid-state method employed in the perovskite (ABX3) structure.
关键词： MAI,XANES,Hybrid perovskite solar cell
更新于2025-09-12 10:27:22
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Roles of spin-orbit coupling in tetragonal hybrid halide perovskite for photovoltaics light-absorber
摘要： Hybrid halide perovskite has been gain appropriate attraction because of their relatively high efficiency in most recently solid-state solar cell development. In this work, A first-principle calculation based on non-local van der Waals-corrected Density Functional Theory (vdW-DFT) is performed to investigate high accuracy atomic structures of a tetragonal structure methyl ammonium (CH3NH3) metal (Pb, Sn) halide (Br3, Cl3, I3). The calculated electronic structures were systematically studied using semi-local exchange-correlation functional (GGA-PBE), non-local functional (hybrid HSE06) and post-DFT approximation (GW). A relativistic effect in metal ion was taken into account by incorporating spin-orbit coupling (SOC) effect to obtain more accurate band gap properties of these materials. Our results shown that SOC corrected the electronic structures about 0.92 eV and 0.19 eV in case of lead ion and tin ion, respectively. The combination between GW approximation and spin-orbit coupling show a good agreement between DFT calculations and experimental studies. This computational scheme is necessary for high accuracy organic-inorganic solar cell design.
关键词： Spin-Orbit Coupling,Hybrid perovskite solar cell,Methyl ammonium metal halide,First-principle calculation
更新于2025-09-12 10:27:22
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Exploiting Bulk Photovoltaic Effect in a 2D Trilayered Hybrid Ferroelectric for Highly Sensitive Polarized Light Detection
摘要： Polarized light detection is attracting increasing attention for its wide applications ranging from optical switches to high-resolution photodetectors. Two-dimensional (2D) hybrid perovskite-type ferroelectrics combining inherent light polarization dependence of bulk photovoltaic effect (BPVE) with their excellent semiconducting performances present significant potential in this portfolio. Here, we first report the BPVE-driven highly sensitive polarized light detection in a 2D trilayered hybrid perovskite ferroelectric, (allyammonium)2(ethylammonium)2Pb3Br10 (1), which shows superior BPVE with a near-bandgap photovoltage of ~ 2.5 V and a high on/off switching ratio of current (~ 104). Notably, driven by the superior BPVE, 1 exhibits highly sensitive polarized light detection with a polarization ratio as high as ~15, which is far more beyond than those of structural anisotropy-based monocomponent devices. As far as we know, this is the first realization of BPVE-driven polarized light detection in hybrid perovskite ferroelectrics. This work opens a new avenue for the design of highly sensitive polarized light detection by exploiting the sinusoidal behavior of BPVE current in 2D multilayered hybrid perovskite ferroelectrics.
关键词： Ferroelectric photovoltaic,Two-dimensional hybrid perovskite,Polarization-sensitive photodetection,Bulk photovoltaic effect,Ferroelectric material
更新于2025-09-12 10:27:22