研究目的
Investigating the effect of white light illumination on reducing defects in perovskite solar cells during synthesis to improve their efficiency and stability.
研究成果
White light illumination during the synthesis of perovskite solar cells forces more iodine into the film bulk, leading to improved iodine homogenization and defect annihilation. This results in devices with improved efficiency and light stability. The study suggests the possibility of kinetically controlling the synthesis of perovskite using low-intensity white illumination.
研究不足
The study focuses exclusively on dry processes, and the photo dynamics in wet processes, which are perplexed by solvent evaporation, demand further examinations. The exact mechanisms of light-induced curing of defects in perovskite are still unclear.
1：Experimental Design and Method Selection:
The study used sequential vapor deposition of perovskite with various kinds of lights (blue, green, red, and white) to assist the synthesis. The irradiances were adjusted to an optimum 2 mW/cm2 using filters.
2：Sample Selection and Data Sources:
Perovskite films were synthesized under different light conditions, and their properties were characterized using X-ray diffraction (XRD), photographs, UV-vis spectra, in-situ electric resistance measurements, Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), and X-ray photoelectron spectroscopy (XPS).
3：List of Experimental Equipment and Materials:
Equipment included lasers and LEDs for illumination, filters for adjusting irradiance, and characterization tools like XRD, ToF-SIMS, XPS, and DLTS.
4：Experimental Procedures and Operational Workflow:
The synthesis involved pre-sprayed MAI evaporated onto a lead halide film under illumination, followed by annealing. The process was monitored using in-situ resistance measurements.
5：Data Analysis Methods:
Data were analyzed using statistical techniques and software tools for XRD, ToF-SIMS, XPS, and DLTS measurements to assess film properties and defect concentrations.
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