研究目的
Investigating the effect of inserting a bathocuproine (BCP) buffer layer at the grating-structured cathode–organic-layer interface in bulk-heterojunction solar cells to enhance power-conversion efficiency.
研究成果
The grating-type BHJ PV cell with a 5-nm-thick BCP layer achieved a maximum power-conversion efficiency of 3.51%. The performance improvement was attributed to the wall side contact, which provided a lower-barrier path for electrons through the thinner BCP layer. This approach effectively combined the functions of the BCP buffer layer without increasing the series resistance.
研究不足
The study's limitations include the rough estimation of the BCP layer's thickness at the wall side and the potential for void formation at the wall side interface during the Al deposition process, which could affect the series resistance and device performance.
1：Experimental Design and Method Selection:
The study involved designing and fabricating a grating-structured interface for a P3HT:PCBM-based BHJ PV cell to achieve a desirable thickness distribution of the BCP buffer layer. A commercially available DVD-R substrate was used as a master mold for the grating-structure. The grating-structured surface was produced using a PDMS secondary mold and spin cast molding technique.
2：Sample Selection and Data Sources:
The materials used included P3HT, PCBM, BCP, and a PEDOT:PSS solution. The substrates were ITO-coated glass plates.
3：List of Experimental Equipment and Materials:
Equipment included a spin-coater (MS-A100, Mikasa), atomic force microscopy (AFM) (SPA400 with an SPI4000 controller, Seiko Instruments), and a vacuum chamber for thermal evaporation.
4：Experimental Procedures and Operational Workflow:
The grating-structured surface was fabricated by spin cast molding using a PDMS mold stamp. The BCP and Al layers were deposited using thermal evaporation. The surface morphologies were observed using AFM.
5：Data Analysis Methods:
The photovoltaic parameters (Jsc, Voc, FF, ηp) of the BHJ PV cells were analyzed to evaluate the effect of the BCP buffer layer.
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