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Issue 8, 2008
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Maskless photolithography using UV LEDs

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A UV light emitting diode (LED) with a maximum output of 372 nm was collimated using a pinhole and a small plastic tube and focused using a microscope objective onto a substrate for direct lithographic patterning of the photoresist. Movement of the substrate with a motorised linear stage (syringe pump) allowed lines in SU-8 to be pattered with a width down to 35 μm at a linear velocity of 80 μm s−1, while in the dry film resist Ordyl SY 330, features as narrow as 17 μm were made at a linear velocity of 245 μm s−1. At this linear velocity, a 75 mm long feature could be patterned in 5 min. Functional microfluidic devices were made by casting PDMS on a master made by LED lithography. The results show that UV LEDs are a suitable light source for direct writing lithography, offering a budget friendly, and high resolution alternative for rapid prototyping of features smaller than 20 μm.

Graphical abstract: Maskless photolithography using UV LEDs

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Article information

11 Jan 2008
12 May 2008
First published
23 Jun 2008

Lab Chip, 2008,8, 1402-1404
Article type
Technical Note

Maskless photolithography using UV LEDs

R. M. Guijt and M. C. Breadmore, Lab Chip, 2008, 8, 1402
DOI: 10.1039/B800465J

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