研究目的
Investigating the effects of 2-aminoterephthalic acid as a cross-linking agent on the defect passivation of grain boundaries in perovskite solar cells to enhance efficiency and stability.
研究成果
The use of 2-aminoterephthalic acid as a cross-linking agent successfully passivated defects at the grain boundaries, enlarged the perovskite grain size, and improved the hydrophobicity of perovskite films. This led to a significant improvement in the power conversion efficiency (PCE) of the solar cells to 21.09% and enhanced stability. The strategy presents a promising approach for designing efficient and stable perovskite solar cells.
研究不足
The study focuses on the passivation of defects at grain boundaries but does not address defects within the bulk of the perovskite grains. The optimal concentration of the cross-linking agent is critical, as higher concentrations can deteriorate the crystallinity of the perovskite.
1：Experimental Design and Method Selection:
A post-treatment procedure was applied using 2-aminoterephthalic acid on perovskite films to passivate defects at grain boundaries. The process involved spin-coating the agent on MAPbI3 films followed by annealing.
2：Sample Selection and Data Sources:
MAPbI3 films were produced using a two-step deposition method. The cross-linking agent was applied at concentrations of 0, 0.2, 0.5, and 1 mg mL-
3：2, 5, and 1 mg mL-List of Experimental Equipment and Materials:
1. 3. List of Experimental Equipment and Materials: Scanning electron microscope (SEM), atomic force microscopy (AFM), conductive atomic force microscopy (C-AFM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), steady-state photoluminescence (PL) spectra, time-resolved photoluminescence (TRPL) spectroscopy, UV-vis absorption spectra.
4：Experimental Procedures and Operational Workflow:
The cross-linking agent was spin-coated on MAPbI3 films and annealed at 150 °C for 5 min. The films were then characterized using SEM, AFM, C-AFM, FTIR, XPS, XRD, PL, TRPL, and UV-vis absorption measurements.
5：Data Analysis Methods:
The data were analyzed to evaluate the morphology, crystallinity, defect passivation, and photovoltaic performance of the treated perovskite films.
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Scanning electron microscope
Used to investigate the effect of the cross-linking agent on the surface morphology of perovskite films.
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Atomic force microscopy
Used to measure the surface roughness of perovskite films.
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Conductive atomic force microscopy
Used to measure the current distribution over the surface of perovskite films.
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Fourier transform infrared spectroscopy
Used to analyze the interaction between the cross-linking agent and the CH3NH3PbI3 crystal.
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X-ray photoelectron spectroscopy
Used to analyze the interaction between the cross-linking agent and the CH3NH3PbI3 crystal.
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X-ray diffraction
Used to analyze the crystallinity of perovskite films.
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Steady-state photoluminescence spectra
Used to evaluate the quality of perovskite films.
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Time-resolved photoluminescence spectroscopy
Used to evaluate the quality of perovskite films.
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UV-vis absorption spectra
Used to evaluate the effect of the cross-linking agent on the absorption of perovskite.
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