研究目的
To synthesize single phase electrospun Cs2SnIxCl6-x double perovskites with varying halide content (I, Cl or mixed I/Cl) as active materials for potential application in perovskite solar cells (PSCs) and to investigate the in-situ formation of graphene oxide (GO) during the annealing process for enhancing the optical properties and thermal stability of the fabricated perovskites.
研究成果
The study successfully demonstrated the fabrication of single-phase electrospun Cs2SnIxCl6-x double perovskites with varying halide content. The in-situ formation of GO during the annealing process significantly enhanced the optical properties and thermal stability of the perovskites. The mixed halide perovskites showed improved optical properties and higher PL intensity compared to pure halide counterparts. The presence of GO also decreased the band gap energy of the perovskites, making them promising candidates for photovoltaic and optoelectronic applications.
研究不足
The study focuses on the synthesis and characterization of Cs2SnIxCl6-x double perovskites and the in-situ formation of GO. The practical application in solar cells and other optoelectronic devices is potential and requires further investigation.
1：Experimental Design and Method Selection:
The sol for electrospinning was prepared on a magnetic stirrer until the chemicals used were fully dissolved in DMF. The sol was then loaded in a 6 ml syringe. A conventional electrospinning setup (MECC Nanon-01A, Japan) was used for the electrospinning of the sol. The working distance was adjusted to 13 cm at a fixed feed rate of
2：3 ml/h, while the working voltage was altered based on the halide ratio and type. The samples were collected on aluminum foil in the temperature range of 25o-32o. The resulting nanofibers were annealed under nitrogen gas at 500 oC for 2 hours at 1oC/min. Sample Selection and Data Sources:
Cs2SnIxCl6-x perovskites were synthesized by varying the halide and its stoichiometry with different ratios of I ― /Cl ― in three different classes of materials.
3：List of Experimental Equipment and Materials:
Chemicals used include cesium iodide (CsI), cesium chloride (CsCl), stannous chloride (SnCl2), dimethylformamide (DMF), and Polyvinylpyrrolidone (PVP, Mw ≈ 1, 300,000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The sol for electrospinning was prepared by dissolving CsI/CsCl along with SnCl4/SnI4 in DMF. PVP was added to the solution to provide the required viscosity for electrospinning. The electrospinning process was carried out under optimized conditions for each compound.
5：Data Analysis Methods:
The fabricated perovskites were characterized using FESEM, HRTEM, XRD, XPS, Raman spectroscopy, TGA, UV-Vis absorbance, and photoluminescence (PL) spectra.
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