研究目的
Investigating the effects of organic ligands like FA and MA on charge separation at the interface between electron transport layers and perovskites in Sn-based perovskite solar cells.
研究成果
The study demonstrated that the increase of FA content in MASnI3 perovskite can improve crystallinity, red-shifted optical band, and modify the local band structure. The best cell performance was obtained at FA : MA = 3 : 1 with a PCE of 5.37%. The findings provide insights into the effect of organic cation on the charge distribution mechanisms of mesoporous perovskite films.
研究不足
The efficiency of the perovskite solar cells obtained in this work is not high compared with those reported in the literature. The study focuses on the effects of organic cations but does not explore other potential optimizations.
1：Experimental Design and Method Selection:
The study involved the fabrication of FAxMA1?xSnI3 perovskite solar cells with varying ratios of FA to MA. The electronic structure and built-in potentials were analyzed using TiO2 mesoporous layers. Local probe techniques such as potential and current mapping were employed to examine charge transport.
2：Sample Selection and Data Sources:
Fluorine-doped tin oxide-coated glass substrates were used. The perovskite films were prepared using a one-step solution process with mixed DMF:DMSO solvent.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM, JEOL, JSM-6700F), ultraviolet-visible (UV-VIS) absorption spectrometer (Lambda 750, PerkinElmer), and Kelvin probe force microscopy (KPFM). Materials included MAI, SnI2, SnF2, and TiO2 paste (Dyesol, DSL 18NRT).
4：Experimental Procedures and Operational Workflow:
The substrate was cleaned and treated with TiO2 blocking layer and mesoporous TiO2 film. Perovskite solution was spin-coated and annealed. HTL and Au electrode were deposited.
5：Data Analysis Methods:
Data were analyzed using PL quenching efficiency, TRPL measurements, and SPV spectroscopy.
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