研究目的
Investigating the effects of cobalt-doped NiOx nanoparticles as hole-transporting materials on the performance of inverted planar perovskite solar cells.
研究成果
Cobalt doping of NiOx nanoparticles at 0.75 mol% significantly improves the performance of inverted planar perovskite solar cells by enhancing perovskite morphology and reducing bulk defects, despite increasing interfacial recombination. This doping level represents an optimal balance for achieving high efficiency with low-temperature processing.
研究不足
The study is limited by the specific range of Co doping concentrations tested and the focus on low-temperature synthesis processes. The impact of higher doping levels or different synthesis temperatures was not explored.
1：Experimental Design and Method Selection
The study synthesized cobalt-doped NiOx nanoparticles with varying Co concentrations (0.75, 1, 1.25, 2.5, and 5 mol%) using a chemical co-precipitation method. The nanoparticles were characterized and used as HTMs in inverted planar perovskite solar cells.
2：Sample Selection and Data Sources
Samples included perovskite solar cells fabricated with NiOx and Co-doped NiOx HTMs. Data were collected on their structural, optical, and electrical properties.
3：List of Experimental Equipment and Materials
Materials included Ni(NO3)2·6H2O, CoCl2·6H2O, PbI2, MAI, and various solvents. Equipment included FEG-SEM JEOL 3100F, XRD D8 Advance, TEM JEOL 2100, AFM CSI-Nano Observer, and a Keithley 2612 source meter.
4：Experimental Procedures and Operational Workflow
The synthesis involved dissolving nickel nitrate in water, adding NaOH, and then CoCl2·6H2O for doping. The mixture was stirred, centrifuged, dried, and calcined. Solar cells were fabricated by spin-coating HTMs and perovskite layers, followed by annealing and electrode deposition.
5：Data Analysis Methods
Data analysis included XRD for crystallinity, SEM and TEM for morphology, AFM for surface roughness, and electrical measurements for device performance.
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