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The University of Southampton
University of Southampton Malaysia

Research project: Thin Film Transparent Graphene Electrode for Organic Solar Cell (OSC)

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Silicon based solar cell technology has been established as the main source in PV solar cells. The solar cell efficiencies vary from 8 to 29%. Though the silicon based efficiency is high, use of silicon technology has major drawbacks; with high production costs and suffers a decrease in performance under illumination, thereby limiting lifetime, durability and stability. Therefore new material such as 1D and 2D graphene has shown potential as the emerging technology for electrodes in organic solar cells.

The use of thin film technology in graphene is expected to revolutionize the manufacturing process by a reduction in cost as the layers become much thinner and less purification processes will be required. The organic solar cells (OSCs) fabricated using thin film graphene is expected to show a power conversion efficiency of more than 70% (1.18 to 3.98 %) indicating that graphene indium-free transparent electrode is a potential substitute for the conventional indium tin oxide (ITO) electrode for use in cost-efficient OSCs.

The need for electrically conducting transparent electrodes is rising steadily with the advent of LCD displays and touch screens and the high intrinsic electron mobility in graphene makes it promising candidates for replacing ITO for such applications. Current bottlenecks concern their availability and purity in sufficient quantities, and the formulation of inks for their deposition using solution-based techniques. The fabrication of electrodes and properties of thin film graphene electrodes will be the focus in this work for use in OSC applications.

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