研究目的
Investigating the effects of adding cesium (Cs) to Formamidium Lead Iodide (FAPbI3) perovskite on the structure, morphology, performance, and stability of hole-transport-free (HTF) mesoporous solar cells.
研究成果
The addition of 15% Cs to FAPbI3-based perovskite improved the photovoltaic performance and stability of HTF mesoporous solar cells. The process eliminated the non-photovoltaic yellow phase, reduced the annealing temperature, and achieved an average efficiency of 7.41% and a highest efficiency of 11.78%. The FA0.85Cs0.15PbI3 perovskite cells demonstrated superior thermal and moisture stability compared to FAPbI3 reference cells.
研究不足
The study highlights the technical constraints related to the one-step deposition method and mesoporous structure, which may lead to additional PbI2 in the structure. The stability and efficiency improvements are significant but may require further optimization for industrial applications.
1：Experimental Design and Method Selection:
The study involved the fabrication of FA1-xCsxPbI3 perovskite solar cells through a single-step deposition method based on Hole-transport material-free (HTF) with a mesoporous structure. The addition of Cs to FAPbI3 was investigated to control the phase stability and improve the photovoltaic performance.
2：Sample Selection and Data Sources:
Fluorine-doped tin oxide (FTO) glass was used as a substrate. The perovskite precursor solutions were prepared by dissolving FAI, CsI, and PbI2 in N, N-dimethylformamide (DMF)/dimethyl sulfoxide (DMSO).
3：List of Experimental Equipment and Materials:
X-ray diffraction system (PANalytical Company X’Pert PRO MPD), scanning electron microscopy (SEM) (TESCAN, Vega 3, Czech), ultraviolet-visible spectrophotometer (Ocean Optics model HR 4000), and a Keithley Model 2400 for current density and voltage measurements.
4：Experimental Procedures and Operational Workflow:
The perovskite precursor solution was coated on the substrate using a one-step antisolvent spin-coating method, followed by annealing. A gold layer was deposited as a back contact.
5：Data Analysis Methods:
The crystal structure was examined by XRD, morphology by SEM, absorption spectra by UV-Vis spectrophotometer, and photovoltaic parameters were measured under AM1.5 simulated irradiation.
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