研究目的
Investigating the crystallization process of PbI2 as a precursor for methyl ammonium lead triodide (CH3NH3PbI3) photo-absorber layer to improve the efficiency of perovskite solar cells.
研究成果
The optimal re-crystallization time for PbI2 solution is 48 h, yielding the highest power conversion efficiency of 9.69% in perovskite solar cells. This improvement is attributed to better morphology and crystallinity of the perovskite layer.
研究不足
The study is limited to the optimization of PbI2 re-crystallization time and its effect on perovskite solar cell efficiency. Other factors affecting efficiency, such as moisture and solution purity, are not deeply explored.
1：Experimental Design and Method Selection:
The study employs a two-step spin-coating method for fabricating perovskite solar cells with an inverted structure. The PbI2 solution is pre-heated and left to re-crystallize at room temperature for varying times (0-60 h).
2：Sample Selection and Data Sources:
The perovskite solar cells are fabricated using FTO/PEDOT: PSS/CH3NH3PbI3/PCBM/Ag structure.
3：List of Experimental Equipment and Materials:
Includes PbI2, dimethylformamide (DMF), MAI (CH3NH3I), PCBM, chlorobenzene (CB), and various equipment for fabrication and characterization.
4：Experimental Procedures and Operational Workflow:
Detailed steps include substrate cleaning, layer deposition via spin-coating, annealing, and electrode evaporation.
5：Data Analysis Methods:
Characterization involves FE-SEM for morphology, XRD for crystallinity, UV-VIS for absorption, and J-V measurements for photovoltaic properties.
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