研究目的
Investigating the morphology tuning of ZnO/P3HT/P3HT-b-PEO hybrid films deposited via spray or spin coating to improve the interface area for exciton separation in hybrid bulk heterojunction solar cells.
研究成果
Spin coated films exhibit smaller and less diverse domain sizes, beneficial for exciton separation in HBSCs. Spray coated films can achieve similar small domains with optimized ZnO ratios, making them suitable for large-scale production. Both deposition methods and composition play crucial roles in morphology tuning for improved solar cell performance.
研究不足
The study is limited to specific deposition methods (spray and spin coating) and material compositions. The surface roughness of sprayed films is higher, which may affect applications. The experiments are conducted under controlled laboratory conditions, and scalability to industrial levels may require further optimization.
1:Experimental Design and Method Selection:
The study compares spray and spin coating deposition methods for fabricating hybrid films. A one-pot sol-gel synthesis method is used, where zinc precursor is incorporated into PEO blocks of the diblock copolymer to reduce aggregation. Morphology is investigated using SEM and TOF-GISANS.
2:Sample Selection and Data Sources:
Hybrid films are prepared with varying weight ratios of ZnO, P3HT, and P3HT-b-PEO. Silicon substrates are used for deposition.
3:List of Experimental Equipment and Materials:
Materials include P3HT-b-PEO, zinc acetate, DCB, DMSO, MEA. Equipment includes an airbrush gun for spray coating, spin coater, SEM (Zeiss Gemini Ultra Plus), TOF-GISANS instrument (REFSANS at FRM II), optical microscope (Axiolab A), and stylus profiler (Bruker DektakXT).
4:Experimental Procedures and Operational Workflow:
Polymers are dissolved in solvent mixture, zinc precursor is added, stirred at 80°C, then deposited via spray or spin coating. Films are annealed at 80°C. Characterization involves SEM, TOF-GISANS, and OM.
5:Data Analysis Methods:
TOF-GISANS data are analyzed using vertical and horizontal line cuts, fitted with models based on DWBA and LMA to extract domain sizes and structures.
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SEM
Gemini Ultra Plus
Zeiss
Used for scanning electron microscopy to investigate surface morphology.
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optical microscope
Axiolab A
Carl Zeiss
Used for optical microscopy to observe surface features.
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stylus profiler
DektakXT
Bruker
Used to detect film thickness.
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airbrush gun
Grafo T3
Harder & Steenbeck GmbH & Co. KG
Used for spray coating deposition of hybrid films.
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TOF-GISANS instrument
REFSANS
Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II)
Used for time-of-flight grazing-incidence small-angle neutron scattering to probe inner film structures.
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