研究目的
To stabilize the desired α-FAPbI3 perovskite phase by protecting it with a two-dimensional (2D) IBA2FAPb2I7 overlayer, formed via stepwise annealing, and to achieve high power conversion efficiency (PCE) and excellent operational stability in perovskite solar cells (PSCs).
研究成果
The study successfully stabilized the α-FAPbI3 perovskite phase using a stepwise annealing method and a molecularly tailored IBA2FAPb2I7 overlayer, achieving a PCE of close to 23% and excellent operational stability under severe combined heat and light stress. This approach provides an efficient and cost-effective way to stabilize and improve the operational stability of FAPbI3-based perovskite solar cells, paving the way for their industrialization.
研究不足
The study focuses on the stabilization of α-FAPbI3 phase and the improvement of PCE and operational stability in PSCs, but the long-term stability under various environmental conditions beyond the tested scenarios (e.g., humidity, UV exposure) is not fully explored.
1：Experimental Design and Method Selection:
The study employed a stepwise annealing method to form films of pure α-FAPbI3 and introduced iso-butylammonium iodide (IBAI) to form a 2D-protective layer on top of the 3D α-FAPbI3 phase.
2：Sample Selection and Data Sources:
FAPbI3 perovskite films were treated with methylammonium chloride (MACl) as a crystallization aid.
3：List of Experimental Equipment and Materials:
Grazing incidence wide angle synchrotron X-Ray diffraction (GIWAX), absorption and photoluminescence analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), grazing incidence wide-angle X-ray scattering (GIWAXS), X-ray reflectivity (XRR), time-resolved photoluminescence (TRPL).
4：Experimental Procedures and Operational Workflow:
The treatment involved spin-coating a 30 mM solution of IBAI in isopropanol on the surface of as-prepared FAPbI3 perovskite films followed by annealing at 110 °C for 10 min.
5：Data Analysis Methods:
Numerical simulations were applied to analyze the different decay kinetics from TRPL measurements.
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