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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 21897–21911

A flatbed scanner for large-area thickness determination of ultra-thin layers in printed electronics

Nils Bornemann and Edgar Dörsam  »View Author Affiliations

Optics Express, Vol. 21, Issue 19, pp. 21897-21911 (2013)

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Enabling solution-based printing techniques for sub-100 nm thin semiconductors for the application in large-area organic electronics is a challenging task. In order to optimize the process parameters, the layers have to be characterized on a large lateral scale while determining the nanometer thickness at the same time. We present a lateral and vertical resolving measurement method for large-area, semi-transparent thin films based on optical interference effects. We analyzed the RGB color images of up to 150 mm square-sized thin film samples obtained by a modified commercial flatbed scanner. Utilizing and comparing theoretical and measured color contrast values, we determined most probable thickness values of the imaged sample area pixel by pixel. Within specific boundary conditions, we found very good agreement between the presented imaging color reflectometry and reference methods. Due to its simple setup, our method is suitable to be implemented as part of a color vision inspection system in in-line printing and coating processes.

© 2013 OSA

OCIS Codes
(100.0100) Image processing : Image processing
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(160.6000) Materials : Semiconductor materials
(310.6860) Thin films : Thin films, optical properties
(330.1720) Vision, color, and visual optics : Color vision

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: July 18, 2013
Revised Manuscript: August 27, 2013
Manuscript Accepted: August 27, 2013
Published: September 10, 2013

Nils Bornemann and Edgar Dörsam, "A flatbed scanner for large-area thickness determination of ultra-thin layers in printed electronics," Opt. Express 21, 21897-21911 (2013)

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