研究目的
Investigating the use of gallic acid (GA) as an antioxidant additive to improve the stability and efficiency of tin-based perovskite solar cells (PSCs).
研究成果
The introduction of GA as a coadditive with SnCl2 in FASnI3 perovskite films significantly improves the air stability and efficiency of tin-based PSCs. The SnCl2–GA complex protects the perovskite grains from oxidation and enhances electron transfer, leading to devices that maintain ~80% of their initial efficiency after 1000 hours in ambient air. This work provides a promising approach for developing stable and efficient lead-free perovskite solar cells.
研究不足
The study focuses on the stability and efficiency improvements of tin-based PSCs with GA additive but does not extensively explore the long-term stability under varying environmental conditions beyond 1000 hours or the scalability of the fabrication process.
1：Experimental Design and Method Selection:
The study employed a coadditive engineering approach by introducing GA together with SnCl2 into FASnI3 perovskite films. The methodology included the preparation of perovskite films via a one-step spin coating method and characterization through various techniques to assess the films' properties and device performance.
2：Sample Selection and Data Sources:
FASnI3 perovskite films were prepared with different additive compositions (without additives, with SnCl2, and with SnCl2 and GA). The films were characterized using SEM, FTIR, XRD, STEM, EELS, XPS, UV-vis absorption spectra, and photovoltaic performance measurements.
3：List of Experimental Equipment and Materials:
Equipment included SEM, FTIR, XRD, STEM, EELS, XPS, UV-vis spectrophotometer, and photovoltaic measurement setup. Materials included FASnI3, SnCl2, GA, DMF, DMSO, ITO, NiOx, PCBM, BCP, and Ag.
4：Experimental Procedures and Operational Workflow:
The perovskite films were fabricated via spin coating from precursor solutions with varying compositions of SnCl2 and GA, followed by thermal annealing. The films were then characterized, and devices were fabricated and tested for photovoltaic performance and stability.
5：Data Analysis Methods:
Data analysis included fitting TRPL decay curves with a biexponential equation, calculating trap densities from SCLC measurements, and analyzing EIS data to determine recombination resistance.
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