研究目的
To investigate the fabrication of indium tin oxide-free bulk heterojunction organic solar cells using inkjet-printed silver grids and PEDOT: PSS, focusing on optimizing the printing parameters for better performance.
研究成果
The research demonstrated that silver grids/PEDOT: PSS composite electrodes are a viable alternative to ITO in organic solar cells, with grids of 2 mm spacing showing the best performance due to a high figure of limit. The study highlights the importance of optimizing printing parameters and grid geometry for enhanced solar cell efficiency.
研究不足
The study did not perform embedding of the silver grids into the glass substrate, which could further improve the power conversion efficiency. The trade-off between sheet resistance and optical transmission limits the optimization of grid spacing and line width.
1：Experimental Design and Method Selection
The study involved inkjet printing of silver nanoparticle ink and PEDOT: PSS for fabricating ITO-free organic solar cells. The significant parameters for printing were identified as waveform parameters voltage and time, substrate temperature, drop spacing, and annealing temperature.
2：Sample Selection and Data Sources
Organic solar cells were fabricated over grids with three different line spacings (1mm, 2mm, and 3mm). The performance was evaluated based on the figure of limit, which is the ratio between optical transmission and sheet resistance.
3：List of Experimental Equipment and Materials
Silver ink with particle size 10 nm and silver concentration 25-60%, high conductivity grade PEDOT: PSS (1% wt. in H2O), P3HT and ICBA (1:1 weight ratio) in ortho dichlorobenzene, glass substrates, and encapsulation materials.
4：Experimental Procedures and Operational Workflow
Silver grids were inkjet printed with a 60 μm print head, annealed at 200?C for two hours. PEDOT: PSS was inkjet printed over the silver grids, annealed at 120?C. The photoactive layer was spin-coated, and devices were encapsulated. Characterization included IV characteristics, optical transmittance, and adhesion tests.
5：Data Analysis Methods
The figure of limit was calculated to evaluate the performance of the current collecting grid. Optical transmission and sheet resistance were measured to assess the trade-off between conductivity and transparency.
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