研究目的
Investigating the use of graphene as an interfacial diffusion barrier between CuSCN and Au layers to enhance the stability of perovskite solar cells.
研究成果
Graphene served as an excellent conductive barrier for moisture, I? ion, and Au diffusion, significantly enhancing the stability of perovskite solar cells without compromising the maximum PCE. The study highlights the potential for further improvements in graphene transfer technology to achieve long-term stability with perfect monolayer graphene barriers.
研究不足
The imperfections during the graphene transfer process decreased the average PCE of multiple devices. The study suggests further improvement in the graphene transfer method to achieve perfect single-layer graphene barrier without compromising the average PCE.
1：Experimental Design and Method Selection:
The study employed atomically-thin impermeable graphene as an interfacial barrier. A new graphene transfer method was developed, and the position was optimized between the CuSCN and Au electrode considering the band alignment of cell components.
2：Sample Selection and Data Sources:
The study used perovskite solar cells with a structure of glass/FTO/TiO2/perovskite/CuSCN/GRP(n)/Au, where GRP(n) represents graphene layers (n = 1, 2, 3).
3：3).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included SEM (JEOL, JSM7600F), STEM (JEOL, JEM ARM 200F), GIXRD (Rigaku, D/MAX-2500/PC), and a digital source meter (Keithley 2400). Materials included graphene synthesized by CVD, CuSCN, and Au electrodes.
4：0). Materials included graphene synthesized by CVD, CuSCN, and Au electrodes.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The graphene transfer method involved using the meniscus of CuSCN precursor solution. The photovoltaic performance was measured under AM 1.5 one sun illumination.
5：5 one sun illumination.
Data Analysis Methods:
5. Data Analysis Methods: The study analyzed the photovoltaic performance, moisture stability, and ion migration using J-V characteristics, GIXRD, and STEM/EDX analysis.
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