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Preparation of high quality perovskite thin film in ambient air using ethylacetate as anti-solvent
摘要： Methylamine lead iodide (CH3NH3PbI3) perovskite thin film solar cell has attracted much attention due to its low cost and high photoelectric conversion efficiency. Preparation of high quality perovskite thin film is the key to obtain high conversion efficiency of solar cells. Here, the pinhole-free CH3NH3PbI3 layer with high coverage and smooth surface is prepared by the one-step solution method in air with ethylacetate as anti-solvent on an electron transport hybrid layer of TiO2 nanoparticles coated porous carbon. The effect of ethylacetate as anti-solvent on the quality of perovskite thin film is studied in detail by comparing with chlorobenzene and ethylether. The high saturation and humidity resistance of ethylacetate in air control the nucleation and growing kinetics of perovskite crystals during the spin coating process, which facilitates the formation of uniform pinhole-free perovskite thin films. The perovskite solar cell based on the prepared high quality thin film achieves the highest conversion efficiency of 17.41% in ambient air with a relative humidity of 35%, which is superior to the perovskite thin films prepared with chlorobenzene and ethylether (conversion efficiency of 10.80% and 10.20%). The higher light-to-electric conversion efficiency is due to high coverage of the pinhole-free perovskite thin film and good contact with the electron transport layer and the hole transport layer.
关键词： Anti-solvent,Perovskite solar cell,Uniform perovskite thin film,Ethylacetate
更新于2025-11-14 17:03:37
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Controlled crystallinity and morphologies of 2D Ruddlesden-Popper perovskite films grown without anti-solvent for solar cells
摘要： Two-dimensional (2D) Ruddlesden-Popper (RP) perovskite films have attracted considerable attention for the environmentally stable perovskite solar cells. However, there is a big space for improving the film crystallinity and its crystallographic orientation to enhance the efficiency of solar cells. In addition, the assistance of anti-solvent is commonly used to obtain a better crystallinity and orientation of 2D RP perovskite films. Nevertheless, the anti-solvent method produces a lot of volatile organic compounds toxic to human health and is challenging to control. Here, we prepared 2D RP perovskite (PEA)2(MA)4Pb5I16 (n = 5) films with the assistance of methylammonium chloride (MACl) additive via a simple one-step deposition method by avoiding anti-solvent treatment. The MACl additive is believed to induce the formation of an intermediate phase composed of perovskite crystals without annealing, which directly promotes the vertical alignment of 2D RP perovskite films on the substrate. The 2D RP films deposited on the mesoporous TiO2 electron transport layer showed high crystallinity and preferential vertical crystallographic orientation. The resulting devices exhibited a power conversion efficiency of 9.7%, much higher than that of the devices prepared without MACl (0.66%).
关键词： High efficiency,High crystallinity and preferential vertical orientation,Two-dimensional perovskite solar cells,No anti-solvent treatment,MACl additive
更新于2025-09-23 15:21:01
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Performance data of CH3NH3PbI3 Inverted Planar Perovskite Solar Cells via Ammonium Halide Additives
摘要： The data provided in this data set is the study of organic-inorganic hybrid perovskite solar cells fabricated through incorporating the small amounts of ammonium halide NH4X (X=F, Cl, Br, I) additives into a CH3NH3PbI3 (MAPbI3) perovskite solution and is published as “High-Performance CH3NH3PbI3 Inverted Planar Perovskite Solar Cells via Ammonium Halide Additives”, available in Journal of Industrial and Engineering Chemistry [1]. A compact and uniform perovskite absorber layer with large perovskite crystalline grains, is realized by simply incorporating small amounts of additives into precursor solutions, and utilizing the anti-solvent engineering technique to control the nucleation and growth of perovskite crystal, turning out the enhanced device efficiency (NH4F: 14.88 ± 0.33 %, NH4Cl: 16.63 ± 0.21 %, NH4Br: 16.64 ± 0.35 %, and NH4I: 17.28 ± 0.15 %) compared to that of a reference MAPbI3 device (Ref.: 12.95 ± 0.48 %). In addition, this simple technique of ammonium halide addition to precursor solutions increase the device reproducibility as well as long term stability.
关键词： perovskite grain size,inverted planar structure,CH3NH3PbI3 perovskite,ammonium halide additives,anti-solvent engineering
更新于2025-09-16 10:30:52
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Nucleation-controlled growth of superior long oriented CsPbBr <sub/>3</sub> microrod single crystals for high detectivity photodetectors
摘要： There has been great interest in the use of cesium lead bromide (CsPbBr3), which is one of the most important members of the all-inorganic perovskite family, due to its superior optoelectronic performance and higher stability. Recently, it has been demonstrated that it is advantageous to use CsPbBr3 microrods and nanowires in photodetectors because of their higher crystallinity, low amount of defects, and easy control of carrier transport along a specific direction as compared to their counterparts of single crystals and thin films. However, there is a shortage of adequate investigations that describe how to control the growth of CsPbBr3 microrods and nanowires so that they retain the optoelectronic performance of single CsPbBr3 microrods. Therefore, we are reporting how to control the growth of orientated dispersive super-long CsPbBr3 microrod single crystals (CsPbBr3 MSCs) via a simple anti-solvent method. The crucial factor in controlling the growth of dispersive super-long CsPbBr3 MSCs is the regulation of the rapid nucleation rate and slowing of the growth rate via controlling the di?usion velocity of anti-solvent methanol. We also reveal the growth mechanism of CsPbBr3 MSCs as layer-by-layer growth that originates from the 2D nucleus. The CsPbBr3 MSCs are revealed grew in the direction of [010], with the (101) facet exposed. Moreover, photodetectors based on one CsPbBr3 MSC were fabricated, and the detectivity (D) and the on/o? ratio were as high as 3.67 (cid:2) 1012 Jones and 988, respectively, suggesting a very strong optoelectronic response as photodetectors. The mechanism that the Cs ions and Cs vacancies use to move to negative and positive electrodes along the channels constructed by [PbBr6]4(cid:3) in the [010] direction of the CsPbBr3 MSC (101) facet was revealed, after activation by the applied electrical field, which is beneficial to enhance the optoelectronic response but does not reduce the device stability.
关键词： anti-solvent method,optoelectronic performance,microrod single crystals,photodetectors,CsPbBr3
更新于2025-09-16 10:30:52
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The humidity-insensitive fabrication of efficient CsPbI <sub/>3</sub> solar cells in ambient air
摘要： Recently, CsPbI3 perovskite solar cells (PSCs) have shown a breakthrough in photovoltaic performance due to their constantly improving power conversion efficiencies (PCEs) because of their admirable photoelectric properties and enhanced thermal stability. However, most fabrication processes take place inside a nitrogen glove box because CsPbI3 is notoriously sensitive to moisture. These tedious and rigorous operational conditions restrict CsPbI3 PSCs' commercialization. In our research, in order to solve the awkward situation of fabricating CsPbI3 PSCs without ambient moisture, we successfully developed an easy, one-step anti-solvent hot substrate (Anti-hot) spin-coating method to fabricate CsPbI3 film. Pre-heating the substrate could change the saturated vapor pressure of the mixed solvents and accelerate the precursor concentrations up to the supersaturation limit. Meanwhile, the anti-solvent method could induce heterogeneous nucleation. As a result, we could efficaciously control nucleation generation and grain growth under ambient moisture conditions and resist erosion and damage by molecular water. Finally, uniform and compact CsPbI3 film could be achieved and the corresponding PSCs reached up to 15.91% in a high humidity environment (RH, ≥50%). We hope that our exploration can provide a synthetic approach for producing high-quality CsPbI3 film for PSCs under ambient conditions.
关键词： anti-solvent hot substrate spin-coating,CsPbI3,perovskite solar cells,humidity-insensitive,ambient air
更新于2025-09-16 10:30:52
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Efficient Anti-solvent-free Spin-Coated and Printed Sn-Perovskite Solar Cells with Crystal-Based Precursor Solutions
摘要： The existence of a mass oxidation of Sn2+ that takes place mainly during preparation of precursor solutions and fabrication of films creates a lead-free solar cell of low open-circuit voltage, which leads to low PCE. To reduce the oxidation process, we employed an innovative crystal fabrication method with anti-solvent-free recrystallization technology. As a result, to the best of our knowledge, both spin-coated and printed lead-free solar cells based on FASnI3 achieved the highest 3D-based PCE to date.
关键词： FASnI3,anti-solvent-free method,lead-free solar cells,PCE,single crystals
更新于2025-09-11 14:15:04