研究目的
To develop a method for preparing high-quality and phase-pure α-FAPbI3 perovskite layers for photovoltaic applications, overcoming the challenge of its easy transformation into a nondesirable δ-FAPbI3 phase.
研究成果
The template-assisted approach enables the preparation of high-quality and phase-pure α-FAPbI3 perovskite layers, demonstrating a power conversion efficiency of 21.24% with great stability under thermal ageing and light soaking. This method provides an effective protocol for fabricating efficient and stable inorganic–organic hybrid heterojunction solar cells.
研究不足
The study focuses on the fabrication of pure α-FAPbI3 perovskite layers and their photovoltaic performance, but does not extensively explore the scalability of the method or its applicability under different environmental conditions.
1：Experimental Design and Method Selection
A template-assisted perovskite structure (MAPbI3-FAI-PbI2-DMSO) was used to avoid and suppress the formation of δ-FAPbI3 phases. The perovskite structure was formed via postdeposition involving the treatment of colloidal MAI-PbI2-DMSO film with FAI before annealing.
2：Sample Selection and Data Sources
Perovskite precursor solution (MAI:PbI2 = 1:1) was spin-coated on mesoporous TiO2/FTO substrate. FAI/isopropanol (IPA) solution was dripped onto the spinning unannealed colloidal film.
3：List of Experimental Equipment and Materials
In situ X-ray diffraction, photoluminescence mapping, Kelvin probe force microscopy, mesoporous TiO2/FTO substrate, FAI/IPA solution.
4：Experimental Procedures and Operational Workflow
The sample was annealed at the initial temperature of 100 °C, transforming the color to dark brown, and the final film turned completely black after the second stage of annealing at 140 °C for an hour.
5：Data Analysis Methods
In situ X-ray diffraction patterns at various temperatures in vacuum were analyzed to confirm the absence of δ-FAPbI3 phase. Photoluminescence mapping and Kelvin probe force microscopy were used to assess film quality and uniformity.
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