Contact photolithography using a carbon-black embedded soft photomask and ultraviolet light emitting diodes with application on patterned sapphire substrates

Heng Hsieh, Chun Ying Wu, Yung-Chun Lee

Research output: Contribution to journalArticle

Abstract

This paper presents a contact photolithography method for large-area ultraviolet (UV) patterning using a soft polydimethylsiloxane (PDMS) photomask and a planar light source consisting of arrayed light-emitting diodes (LEDs). With simple design and construction, the UV light source can achieve uniformly distributed UV light intensity over an area of 4′ in diameter but its divergent angle is 15°. To overcome this large divergent angle, a PDMS soft mold embedded with carbon-black inserts as the UV light blocking materials is applied. It is demonstrated that, when increasing the aspect ratio of the carbon-black inserts, one can achieve excellent UV patterning results. Both experimental data and simulation results are presented. This contact photolithography system has been successfully used for manufacturing patterned sapphire substrates (PSSs) in LED industry. The advantages and potential applications of the proposed method will be addresses.

Original languageEnglish
Pages (from-to)8620-8631
Number of pages12
JournalOptics Express
Volume24
Issue number8
DOIs
Publication statusPublished - 2016 Apr 18

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photomasks
photolithography
ultraviolet radiation
sapphire
light emitting diodes
inserts
carbon
light sources
luminous intensity
aspect ratio
manufacturing
industries
simulation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "This paper presents a contact photolithography method for large-area ultraviolet (UV) patterning using a soft polydimethylsiloxane (PDMS) photomask and a planar light source consisting of arrayed light-emitting diodes (LEDs). With simple design and construction, the UV light source can achieve uniformly distributed UV light intensity over an area of 4′ in diameter but its divergent angle is 15°. To overcome this large divergent angle, a PDMS soft mold embedded with carbon-black inserts as the UV light blocking materials is applied. It is demonstrated that, when increasing the aspect ratio of the carbon-black inserts, one can achieve excellent UV patterning results. Both experimental data and simulation results are presented. This contact photolithography system has been successfully used for manufacturing patterned sapphire substrates (PSSs) in LED industry. The advantages and potential applications of the proposed method will be addresses.",
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Contact photolithography using a carbon-black embedded soft photomask and ultraviolet light emitting diodes with application on patterned sapphire substrates. / Hsieh, Heng; Wu, Chun Ying; Lee, Yung-Chun.

In: Optics Express, Vol. 24, No. 8, 18.04.2016, p. 8620-8631.

Research output: Contribution to journalArticle

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