Case 12843

Organic Based Solar Cell with Patterned Exciton Blocking Layer

Keywords:

Photon processing structures, organic-based solar cells, nanopatterned substrates, exciton blocking layer

Applications:

Organic solar cells, sensors, photon-emission devices, portable “off-grid” power generation sources

Problem:
  • Limit on the efficiencies of the conventional planar bilayer structure of organic-based solar cells
  • Poor coverage over the solar spectrum

Technology:

Organic semiconducting layers are configured with certain nanosized features to enhance solar radiation absorption while maintaining the thickness of the layers within the order of one exciton diffusion length. The p-type and n-type semiconductors can be configured to form single p-n junctions, multiple separate junctions, or bulk heterojunctions. Nanofeatures can also be used on an exciton blocking layer surface formed from organic polymers. The photon processing device includes a conducting substrate or a metal bus line to transport the generated current. The substrate is transparent to certain wavelengths of the solar radiation and may include a textured surface with periodic nanosized features. The photo processing device may also have multiple n-p layers coupled to act as parallel p-n junctions. The device can be fabricated using nanoimprint and thermal evaporation techniques on flexible substrates.

Advantages:
  • Improvement in conversion efficiency by a factor of 2 or more
  • Enhancement in electronic transport characteristics
  • Ease of fabrication

Inventors:

Intellectual Property:

U.S. Patent Application Number 12/566278, filed on September 24, 2009

Publications:

N/A

Last revised: November 8, 2010

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