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Organic Solar Cells

Organic Photovoltaic Devices

  Renewable energy has been an area of great interest for years, due to its long term availability in the advent of dwindling fossil fuel resources. In particular, solar energy has the greatest potential, as the energy originating from the Sun is theoretically limitless. Conventional silicon-based photovoltaics have yielded respectable power conversion efficiencies (PCE), but the cost of production of silicon solar cells limited the widespread use of such technologies.
   However, a possible alternative to these expensive silicon p-n junction cells is the organic photovoltaic (OPV) device. Its inherent lower cost coupled with its stability and reasonable efficiency makes it a strong candidate to compete with conventional silicon cells in terms of cost-effectiveness.
   In our laboratory, our research is focused on OPVs with both the normal-type architecture and the inverted-type architecture.
Normal-type solar cells
   The OPV using the normal-type architecture is an established technology. In our laboratory, we have the advantage of using novel small molecule electron donor materials such as porphyrins and acenes, or novel fullerene derivatives, to push PCEs to greater heights.
Inverted-type solar cells
   Compared to its normal-type counterpart, the inverted OPV is a relatively new technology. The advantage of the inverted OPV is that it could maintain its high PCE over long periods of time even without encapsulation. In addition, the fabrication process could be conducted under ambient conditions, and is also compatible to all-solution processing. Other than the application of novel active materials, we are also involved in the development of electron collecting layers made from various metal oxides.


Organic Solar Cells (Large Area)

Our Solar Cell in National Museum of Emerging Science and Innovation (MIRAIKAN)