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Metal contact printing photolithography for fabricating sub-micrometer patterned sapphire substrates in light-emitting diodes | IEEE Conference Publication | IEEE Xplore

Metal contact printing photolithography for fabricating sub-micrometer patterned sapphire substrates in light-emitting diodes


Abstract:

This paper reports a novel process which is combine the contact metal transfer method and traditional photolithography process for fabricate nano-scale pattern sapphire s...Show More

Abstract:

This paper reports a novel process which is combine the contact metal transfer method and traditional photolithography process for fabricate nano-scale pattern sapphire substrate (NPSS) used in high brightness light emitting diodes (LEDs). The novel process can directly transfer a metal pattern onto the PR layer which above the sapphire substrate, the transferred metal pattern can as a perfect photo-mask for subsequent photolithography process. In this work, the high aspect ratio PR structures with the aspect ratio of 5 and line width of 500 nm are created by this novel process. Furthermore, the PR structure can as a etching mask for inductively coupled plasma (ICP) etching on the sapphire substrate. During the ICP etching, we successfully to obtain the NPSS with a perfect cone shape. Experiments have been demonstrate the feasibility of using this new approach for obtaining sub-micrometer surface structures on the complete surface area of a 2 inch and 4 inch sapphire substrates.
Date of Conference: 05-08 March 2012
Date Added to IEEE Xplore: 10 May 2012
ISBN Information:
Conference Location: Kyoto, Japan

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