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Improved Energy Transfer Efficiency for Organic Photovoltaic Cells

Technology #20120109

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Organic Photovoltaic CellsImprove Energy Transfer EfficiencyHeterojunction Organic Photovoltaic
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Researchers
Russell Holmes, PhD
Associate Professor, Chemical Engineering and Material Sciences
External Link (www.cems.umn.edu)
Managed By
Kevin Nickels
Technology Licensing Officer 612-625-7289

Simple, Low Cost Organic Photovoltaic Devices

An improved organic photovoltaic device increases the exciton diffusion lengths and efficiency of energy transfers.  These organic photovoltaic cells incorporate a dilute, electron donor layer, which permits control over the photoluminescence efficiency and a lifetime of the generated exciton.  The devices are compatible with high throughput, simple fabrication processes, and low cost materials, making them an ideal source for renewable energy.   This approach increases the diffusion length by developing a simple, planar heterojunction organic photovoltaic device that increases efficiency, improves stability, and reduces costs.

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This technology can be licensed as part of the Organic Photovoltaic Portfolio.

Organic Photovoltaic Cells with Improved Efficiency of Energy Transfer

This technique uses a new approach for engineering organic photovoltaic cells.  The devices described here do not depend on increasing the interface area for exciton dissociation, but instead attempt to solve the fundamental problem of short exciton diffusion length.  This method improves energy transfer efficiency by diluting electron donor in the host material and increasing the separation distance between donor molecules in the host.  Spatial separation of the donor molecules reduces the non-radiative decay rate and increases the diffusion length of excitons along the donor.  This leads to a 50% increase in device efficiency.

FEATURES OF ORGANIC PHOTOVOLTAICS

  • State of the art efficiency for organic photovoltaic cells-- method increases energy  transfer efficiency
  • Low cost--compatible with high throughput, simple fabrication processes and low cost materials
  • Simple planar heterojunction devices-- printed on low cost, flexible substrates