研究目的
To investigate the use of water as a green solvent for the fabrication of high-quality CsPbBr3 films for efficient solar cells, aiming to reduce solvent toxicity and update the understanding of water's role in perovskite solar cell research.
研究成果
The study successfully demonstrated the use of water as a green solvent for fabricating high-quality CsPbBr3 films, achieving a power conversion efficiency of 6.12% in solar cells. This approach reduces solvent toxicity and challenges the negative perception of water in perovskite solar cell fabrication, offering a simple, low-cost, and environmentally friendly method.
研究不足
The study focuses on CsPbBr3 films and their application in solar cells, which inherently have a wide bandgap (~2.3 eV) limiting their efficiency. The method's applicability to other perovskite materials and under varying environmental conditions was not explored.
1：Experimental Design and Method Selection:
A two-step spin-coating method was employed to prepare CsPbBr3 films using water as a solvent for CsBr due to its high solubility, while PbBr2 was dissolved in DMF due to its low solubility in water.
2：Sample Selection and Data Sources:
Fluorine-doped tin oxide (FTO) glass substrates were used, cleaned and coated with TiO2 layers before the perovskite film deposition.
3：List of Experimental Equipment and Materials:
FTO glass, TiO2 paste (Dyesol-18NRT, Dyesol), PbBr2, CsBr, DMF, water, and carbon for the back-electrode.
4：Experimental Procedures and Operational Workflow:
PbBr2 films were first deposited from DMF solution onto TiO2-coated FTO substrates, followed by spin-coating CsBr/H2O solution onto PbBr2 films and annealing to form CsPbBr3 films. Carbon back-electrodes were then screen-printed.
5：Data Analysis Methods:
The films were characterized by SEM, XRD, UV-Vis spectrophotometry, and PL spectroscopy. Solar cell performance was evaluated by J-V curves and IPCE measurements.
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