研究目的
To replace toxic solvents used in the fabrication of perovskite solar cells with green solvents for ecological environment safety and the health of operators, and to prepare high-quality CsPbBr3 films using all green solvents based on a two-step spin-coating method.
研究成果
High-quality CsPbBr3 films were successfully prepared using all green solvents through a two-step spin-coating method, achieving a power conversion efficiency of 8.11%. This work provides an environment-friendly and safe fabrication approach for the industry large-scale production of perovskite solar cells.
研究不足
The study focuses on CsPbBr3-based solar cells and the use of green solvents, which may not be directly applicable to other types of perovskite solar cells or different solvent systems. The performance of the solar cells might be limited by the presence of Cs4PbBr6 phase in the CsPbBr3 films.
1：Experimental Design and Method Selection:
A two-step spin-coating method was employed to prepare CsPbBr3 films using green solvents. The first step involved preparing PbBr2 solutions using a green solvent system of polyethylene glycol (PEG) with γ-butyrolactone, matching the Hansen solubility parameters (HSPs) between PbBr2 and the mixed solvent system. The second step used green water to dissolve CsBr for preparing a high concentration CsBr/H2O solution.
2：Sample Selection and Data Sources:
PbBr2 and CsBr were used as precursors. The solvents included PEG, γ-butyrolactone, and water.
3：List of Experimental Equipment and Materials:
Field-emission SEM (NoVaTM Nano SEM 430), XRD (PANalytical X’Pert 3 Powder), UV–vis spectrophotometer (UV-2550), FTIR spectroscopy (VERTEX 70v), and a SVM 3000 Stabinger Viscometer for viscosity measurements.
4：Experimental Procedures and Operational Workflow:
PbBr2 was dissolved in a mixture of PEG and γ-butyrolactone, spin-coated, and treated with acetic acid. CsBr/H2O solution was then spin-coated onto the PbBr2·(PEG) films, followed by annealing.
5：Data Analysis Methods:
The films were characterized by SEM, XRD, UV–vis, and FTIR. The photovoltaic performance was measured using a Keithley 2400 under AM 1.5G simulated solar illumination.
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