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Eulitha & DNP Reveal Photonic Crystal Patterning On 4 Inch Wafers

Using Eulitha’s PHABLE technology and photomasks made by DNP, the firms say they have passed a major milestone. This innovation will be of use in the high brightness LED industry which is moving from 2” to 4

Eulitha AG of Switzerland and Japanese firm Dai Nippon Printing (DNP) have successfully patterned  4" wafers with Eulitha's proprietary PHABLE technology. Photonic crystal patterns with a 600 nm period and hexagonal symmetry were created uniformly over 4" wafers.   PHABLE is a novel mask based photolithography technology that hopes to revolutionise production of photonic structures such as photonic crystals, diffraction gratings and anti-reflection surfaces. High-throughput fabrication of such patterns over large areas is required for fabrication of high performance future devices in fields including LEDs, solar cells and flat-screen displays. PHABLE technology involves a mask being illuminated with a UV beam to form a high resolution image that has a very large depth of focus. Therefore substrates with non flat surfaces can be patterned easily. The high-resolution mask with the same 4-inch area as the final pattern was produced by DNP on a standard quartz/Cr plate. UV photolithography exposures were performed on a PHABLE-R lithography tool made by Eulitha.   Photonic crystal patterns consisting of circular holes on a 600-nm period hexagonal lattice were printed in a commercially available photoresist coated on silicon wafers. The produced patterns were highly uniform over the whole 4" area of the wafers. Demonstration of uniform patterning on 4" substrates is an important milestone as most targeted applications require patterning of large areas. For example, the high brightness LED industry is switching to 4" and 6" wafers from the traditional 2" base. Photonic crystal structures that enhance light extraction in LEDs or patterned sapphire substrates that improve performance of LEDs grown on them can be fabricated with the PHABLE technology. Similarly, substrates required for nanowire based LED or solar cell applications can be produced with this technology. Eulitha currently offers samples and wafer batch processing services to companies and researchers developing nanostructure-based products. It is also currently offering laboratory lithography tools for 2"to 4" wafers that are suitable for product development.

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