研究目的
To investigate the role of a filmy poly methyl methacrylate (PMMA) layer in passivating interfacial and intergranular defects in perovskite solar cells, thereby improving their performance and stability.
研究成果
The introduction of a PMMA passivation layer at the Perovskite/Spiro-OMeTAD interface effectively reduces defect-induced recombination, leading to improved open-circuit voltage and power conversion efficiency in perovskite solar cells. The PMMA layer also enhances the devices' stability against moisture and oxygen, maintaining 95% of initial efficiency after one month under ambient conditions. This passivation strategy presents a simple and cost-effective method to advance the commercialization of perovskite solar cells.
研究不足
The study is limited by the insulating nature and high resistivity of PMMA at higher concentrations, which can reduce photovoltaic parameters. Additionally, the long-term stability under varying environmental conditions beyond 60% relative humidity was not explored.
1：Experimental Design and Method Selection:
The study involved the fabrication of planar-structure perovskite solar cells with a PMMA layer introduced at the Perovskite/Spiro-OMeTAD interface to passivate defects.
2：Sample Selection and Data Sources:
Perovskite films with various molecular weights and concentrations of PMMA were prepared and characterized.
3：List of Experimental Equipment and Materials:
Equipment included a field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), UV-Vis spectrometer, and femtosecond transient absorption (fs-TA) system. Materials included PMMA, Spiro-OMeTAD, and perovskite precursors.
4：Experimental Procedures and Operational Workflow:
The PMMA layer was spin-coated onto the perovskite film, followed by the deposition of Spiro-OMeTAD and gold electrodes. The devices were then characterized for performance and stability.
5：Data Analysis Methods:
Data were analyzed using Mott-Schottky measurements, electrochemical impedance spectroscopy (EIS), and transient absorption spectroscopy to understand the passivation effects and charge transport properties.
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