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Fabrication and optimization of nanocube mixed halide perovskite films for solar cell application
摘要： In this article, we report the tailoring of nanostructured mixed halide perovskite MAPb(I1-xBrx)3 films with tunable band gap fabricated by anion exchange reaction. In this process, we used PbBr2 and methyl ammonium iodide (MAI) in order to fabricate mixed halide perovskite films. We have observed an uncommon shape transformation from nanocube-hollow tetraoids-nanocubes/plate. The underlying mechanism of shape transformation was discussed based on experimental results. The driving force for such shape transformation is combined effect of anion exchange reaction between I? and Br? at the solid/liquid interface of PbBr2 and MAI, and mechanical driving force exerted by the spin coating process. The shape transformation is highly reproducible, verified by two step process, dipping as well as spinning process. The best performing device using the nanostructured perovskite films in a device architecture FTO/TiO2/MAPb(I1-xBrx)3/Spiri-OMeTAD/Au shows a current density (Jsc,) of 23.58 mA/cm2, open circuit voltage (Voc) of 0.891 V and fill factor (FF) of 0.608, with a power conversion efficiency (η) of 12.79% in forward sweep. In reverse sweep, the device shows the Jsc (mA/cm2), Voc (V), FF, and η (%) are 23.852, 0.891, 0.716 and 15.237, respectively.
关键词： Nanostructured perovskite films,Anion exchange reaction,Shape transformation,Mixed halide perovskite films,Perovskite solar cell
更新于2025-09-19 17:13:59
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Enhancing Grain Growth for Efficient Solution-Processed (Cu,Ag) <sub/>2</sub> ZnSn(S,Se) <sub/>4</sub> Solar Cells Based on Acetate Precursor
摘要： Material crystallinity is the overriding factor in the determination of the photoelectric properties of absorber materials and the overall performance of photovoltaic device. Nevertheless, in Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic device the bilayer or tri-layer structure for the absorber have been broadly observed, which are generally harmful to the cell performance due to the probability of photogenerated carrier recombination at grain boundaries significantly increased. Herein, our experiment reveals that application of anions to a new family of (Cu,Ag)2ZnSn(S,Se)4 (CAZTSSe) materials leads to the increase of grain size and crystallinity. It is inspiring that by using acetate starting materials in precursor solution, a uniform, compact and pinhole-free CAZTS precursor film was obtained, and the smoothness of the films surpassed that of films fabricated from oxide route. More importantly, the crystallization of the CAZTSSe film has been considerably enhanced after selenization, large grains go through the entire absorber layer was successfully obtained. Additionally, it is observed that the Voc accompanied by excellent crystallinity improved significantly due to the pronouncedly reduced carrier recombination loss at grain boundaries. As a consequence, the power conversion efficiency (PCE) of the CAZTSSe photovoltaic device is successfully increased from 10.35% (oxide route) to 11.32% (acetate route). Importantly, our work attest to the feasibility of tuning the crystallization of the CZTSSe film by simple chemistry.
关键词： crystallization,CAZTSSe solar cell,recombination,anion,acetate starting material
更新于2025-09-19 17:13:59
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Selective fluorescence sensing of H <sub/>2</sub> PO <sub/>4</sub><sup>a??</sup> by the anion induced formation of self-assembled supramolecular polymers
摘要： The utilization of anions to induce the formation of self-assembled supramolecular polymers in solution is an undeveloped area of host–guest chemistry. We report in this manuscript a comparative study of two tripodal anion receptors by hydrogen or halogen bonding interactions to form self-assembled supramolecular structures induced by the presence of anions. DOSY NMR and DLS experiments provided evidence for the formation of supramolecular structures in solution in both halogen and hydrogen bond donors with H2PO4? anions. The nucleation and elongation constants obtained using the thermodynamic model indicate that the polymers grow following an isodesmic mechanism. Emission studies demonstrate that only the formation of the supramolecular polymer between the halogen bond donor receptor and H2PO4? anions results in the appearance of the excimer emission band.
关键词： halogen bonding,hydrogen bonding,DLS,anion receptors,DOSY NMR,excimer emission,supramolecular polymers
更新于2025-09-19 17:13:59
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Dual Naked-Eye Optical Sensor Based on Imidazolium Cation and Napthalamide for Specific Detection of Fluoride
摘要： A novel naked eye fluorescence sensor (ANI) based on naphthalimide and imidazolium moieties for fluoride detection has been designed and synthesized by multiple step synthesis. The fluorescence response of ANI sensor was significantly quenched in the presence of fluoride ion upon the interaction between an acidic amide proton and acidic C2 proton (-C(2)H-) of imidazolium compound. The binding behavior of ANI and F? ion was extensively explored by using NMR titration. Comparison of binding ability of ANI and AN sensors addressed the dominant electrostatic and hydrogen bonding interaction with F? ion. Consequently, ANI sensor highlights a strong binding with F? ions with a high selectivity over AN. Interestingly, ANI demonstrated a naked-eye response with colorimetric and fluorometric assay.
关键词： Fluorescence,Fluoride anion,Dual optical sensor,Anion recognition
更新于2025-09-16 10:30:52
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Positional Isomerism Controlled Electronic and Photochromic Properties of Naphthalene Diimide-Based Chlorozincate Hybrids
摘要： Two organic-inorganic hybrids, [3-H2DPNDI][ZnCl4]·0.5H2O (1) and [4-H2DPNDI][ZnCl4]·0.5H2O (2) (3-H2DPNDI2+ = protonated N, N-di(3-pyridyl)-1,4,5,8-naphthalene diimide, 4-H2DPNDI2+ = protonated N, N-di(4-pyridyl)-1,4,5,8-naphthalene diimide), have been designed and prepared. Compounds 1 and 2 are constructed from typical [ZnCl4]2- inorganic clusters and positional isomeric organic cations of [H2DPNDI]2+, which are assembled into different 3-D supramolecular networks via different anion-π interactions and hydrogen-bonding interactions. Photochromism of 1 and non-photochromism of 2 are attributable to the usage of positional isomers, which lead to the different spatial stack of [ZnCl4]2- donors and [H2DPNDI]2+ acceptors, suggesting delicate modulating effect of the distinct interfacial contacts on the intermolecular charge transfer/electron transfer and consequently photoresponsive behaviors.
关键词： organic-inorganic hybrids,positional isomerism,anion-π interactions,chlorozincate,photochromism,naphthalene diimide
更新于2025-09-16 10:30:52
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Pink all-inorganic halide perovskite nanocrystals with adjustable characteristics: Fully reversible cation exchange, improving the stability of dopant emission and light-emitting diode application
摘要： In this work, we proposed a straightforward and effective strategy for preparing pink all-inorganic halide perovskite nanocrystal (NC) phosphors for light-emitting diode (LED) application. The pink perovskite NCs with varying Mn contents could be easily and steadily obtained via postsynthetic ion exchange at room temperature. The dependence of the size and optical properties of pink NCs on dopant content was systematically investigated. The reversible anion exchange processes of pink perovskite NCs were conducted with halide salts containing or excluding Pb. The contrasting results suggested that the irreversibility of Mn-emission was mainly affected by the fully reversible cation exchange between Pb2+ and Mn2+. The pink NCs with better stability of dopant emission and high monodispersity were successfully developed by compounding with silica. A pink LED was further made by using the pink NCs/silica composites as pink phosphors on a 395 nm InGaN LED chip. This work provides a feasible strategy for the fabrication of pink LEDs, which may have great application prospects in the field of special lighting, like neon lights and plant growth lights.
关键词： light-emitting diodes,anion exchange,perovskite nanocrystals,stability,cation exchange
更新于2025-09-12 10:27:22
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An anion exchange membrane electrode assembled photoelectrochemical cell with a visible light responsive photoanode for simultaneously treating wastewater and generating electricity
摘要： In this work, an anion exchange membrane electrode assembled photoelectrochemical cell is designed for simultaneously degrading organics and generating electricity. The proposed photoelectrochemical cell is formed by assembling a visible light responsive photoanode and an air-breathing cathode with an anion exchange membrane. Benefited from the intrinsic property of the anion exchange membrane, the hydroxyl transport can be enhanced and the organics crossover can be reduced to improve the performance of the proposed photoelectrochemical cell. Experimental results show that increasing the electrolyte concentration and light intensity yields higher performance because of the more efficient capture and generation of photo-excited holes. Besides, the cell performance can also be enhanced with increasing ethanol concentration in the testing range, demonstrating the lowered ethanol crossover through the anion exchange membrane and mixed potential at the cathode. The obtained results are useful for not only the optimization of the photoelectrochemical cell design but also the promotion of its practical application.
关键词： Membrane electrode assembly,Air-breathing cathode,Photoelectrochemical cell,Visible light response,Anion exchange membrane
更新于2025-09-12 10:27:22
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The role of cation and anion dopant incorporated into a ZnO electron transporting layer for polymer bulk heterojunction solar cells
摘要： Doping is a widely-implemented strategy for enhancing the inherent electronic properties of charge transport layers in photovoltaic devices. A facile solution-processed zinc oxide (ZnO) and various cation and anion-doped ZnO layers were synthesized via the sol–gel method and employed as electron transport layers (ETLs) for inverted polymer solar cells (PSCs). The results indicated that all PSCs with doped ZnO ETLs exhibited better photovoltaic performance compared with the PSCs with a pristine ZnO ETL. By exploring the role of various anion and cation dopants (three compounds with the same Al3+ cation: Al(acac)3, Al(NO3)3, AlCl3 and three compounds with the same Cl? anion: NH4Cl, MgCl2, AlCl3), we found that the work function changed to favor electronic extraction only when the Cl anion was involved. In addition, the conductivity of ZnO was enhanced more with the Al3+ cation. Therefore, in inverted solar cells, doping with Al3+ and Cl? delivered the best power conversion efficiency (PCE). The maximum PCE of 10.38% was achieved from the device with ZnO doped with Al+ and Cl?.
关键词： electron transport layers,Al3+ cation,polymer solar cells,doping,Cl? anion,photovoltaic performance,power conversion efficiency,sol–gel method,zinc oxide
更新于2025-09-12 10:27:22
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Anion exchange polymeric sorbent coupled to high‐performance liquid chromatography with <scp>UV</scp> diode array detection for the determination of ten <i>N</i> ‐nitrosamines in meat products: a validated approach
摘要： Among mechanisms and molecules presumably involved in the carcinogenicity induced by meat consumption, the N-nitrosamines (N-NAs) are a class of compounds characteristic of processed meats. In this work, an analytical method for the determination of 10 N-Nitrosamines (N-Nitrosomorpholine, N-Nitriosomethyethylamine, N-Nitrosopyrrolidine, N-Nitrosodiethylamine, N-Nitrosopiperidine, N-Nitrosodipropylamine, N-Nitrosomethylaniline, N-Nitrosodibutylamine, N-Nitrosodiphenylamine, N-Nitrosodibenzylamine) in fresh meats and meat products was developed, optimized and validated. The method is based on optimized sample purification by solid phase extraction (anion exchange polymeric sorbent) and separation/detection by high performance liquid chromatography coupled to UV diode array detection. The validation procedure allowed to ascertaining good analytical performances in terms of sensitivity, selectivity towards interfering compounds, accuracy and robustness. The values obtained for precision (range: 4.3% - 14.4%) and recovery percentages (range: 80.8% - 95.1%) were compared to reference values indicated in the Decision No. 657/2002/EC, resulting as compliant. The measurement uncertainty (lower than 14.6%) was satisfactory for each N-NA as well.
关键词： meat,food safety,solid phase extraction,validation,diode array detection,Nitrosamines,processed meats,HPLC,carcinogenic compounds,anion exchange sorbent
更新于2025-09-11 14:15:04
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Synthesis, structure, luminescence and electrochemical and antioxidant properties of anion‐controlled silver(I) complexes with 2,2′‐(1,4‐butanediyl)bis‐1,3‐benzoxazole
摘要： To explore the influence of various anions on the self‐assembly and properties of silver complexes, reactions of anions of silver salts with 2,2′‐(1,4‐butanediyl)bis‐1,3‐benzoxazole (BBO) afforded four complexes, formulated as [Ag2(BBO)2(p‐toluenesulfonate)2] (1), {[Ag(BBO)(picrate)]}∞ (2), {[Ag(BBO)1/2(o‐coumarate)]·DMF}∞ (3) and {[Ag2(BBO)3](PF6)2}∞ (4). These complexes were characterized using elemental analysis, infrared spectroscopy and single‐crystal X‐ray diffraction. The crystal analysis results show that under the influence of coordination modes and steric hindrance of anions, the complexes exhibited binuclear (1), one‐dimensional polymeric (2 and 3) and two‐dimensional polymeric (4) structures. Compared with the BBO ligand, only complex 1 has a new emission peak at 428 nm, which is attributed to ligand–metal charge transfer. The emission peaks of complexes 2–4 are similar to those of the BBO ligand, which can be due to π–π* and n–π* transitions. These results indicate that anions can modulate the structures and luminescent properties of silver complexes. Moreover, cyclic voltammograms of 1–4 indicated an irreversible Ag+/Ag couple with the order of reversibility being 2 > 1 > 4 > 3. In vitro antioxidant experiments showed that complex 3 has significant antioxidant activity against superoxide and hydroxyl radicals.
关键词： luminescence,anion regulation,electrochemical property,antioxidant,Ag(I) complex
更新于2025-09-11 14:15:04