研究目的
Investigating the effect of poly(allylamine hydrochloride) (PAH) as an additive on the compactness and crystal quality of perovskite active layers for efficient photovoltaics.
研究成果
The application of PAH with low concentration significantly enhances the compactness of perovskite crystals, leading to improved charge transport efficiency and stability in humidity environments. The optimal doping concentration was found to be around 1.0 vol.%, achieving an average efficiency over 19%. This strategy also improves the long-term stability of perovskite solar cells in humidity conditions without encapsulation.
研究不足
The study is limited by the need to balance the compactness of perovskite crystals and the aggregation of PAH, which requires precise control of the doping concentration. Overdoping can lead to PAH aggregation, suppressing charge transfer and forming trap centers.
1：Experimental Design and Method Selection:
The study employed PAH as an additive to enhance the crystal quality of perovskite active layers. The volume fractions of PAH were tuned from
2：000% to 060% into MAPbI3 precursor. Sample Selection and Data Sources:
The MAPbI3 precursor contains methylammonium iodide (MAI) and lead (II) iodide (PbI2) in mole ratio 1:1, dissolved in N,N-dimethylformamide (DMF).
3：List of Experimental Equipment and Materials:
Instruments included a Hitachi spectrometer, fluorescence spectrometer (Edinburgh Photonics FLS980), field emission SEM (FE-SEM, Hitachi S4800), and Zahner electrochemical workstation.
4：Experimental Procedures and Operational Workflow:
The perovskite precursor solution was spin coated on ETL as an active layer, followed by annealing. The spiro-OMeTAD was spin coated onto the active layer as hole transport layer (HTL), and a gold counter electrode was deposited by thermal evaporation.
5：Data Analysis Methods:
The performance of perovskite solar cells was characterized under AM 1.5G condition, and the absorption measurement was measured by a spectrometer. Fluorescence and time-resolved photoluminescence (TR-PL) were characterized by the fluorescence spectrometer.
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