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Proceedings Paper

Replicated microstructures with optical functions in solar and display applications
Author(s): Andreas Gombert; Benedikt Blasi; Christopher Buehler; Peter Nitz; Joerg Mick; Wolfgang Hossfeld; Michael Niggemann
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Paper Abstract

By surface-relief structures optical functions like anti-reflection, light trapping or light distribution and re-direction can be realized. New applications in solar energy systems and in displays require structures with sub-micron features which are homogeneously distributed over large areas. This paper addresses the design and the whole experimental process chain from the micro structure origination on large areas to the replication and the system integration in the specific application. Topics are antireflective surfaces for solar systems and displays, light trapping in polymer solar cells, sun protection systems for facades and diffusers for projection displays and in glazing. For the micro structure origination we investigated the suitability of holographic recording in photoresist by using a large scale interferometer. An argon ion laser was used as a coherent light source at a wavelength of 364nm. With the interferometer set-up periodic and stochastic interference patterns were recorded in positive photoresist. In the case of periodic structures, grating periods between 200nm and 20µm have been realized. By carefully modeling resulting resist profiles it was possible to originate even prismatic surface-relief profiles. Structures with good homogeneity were originated on areas of up to 4800 cm2 by optimizing the interferometer set-up and the photoresist processing.

Paper Details

Date Published: 29 December 2003
PDF: 14 pages
Proc. SPIE 5184, Physics, Theory, and Applications of Periodic Structures in Optics II, (29 December 2003); doi: 10.1117/12.504588
Show Author Affiliations
Andreas Gombert, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Benedikt Blasi, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Christopher Buehler, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Peter Nitz, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Joerg Mick, Albert-Ludwigs-Univ. Freiburg (Germany)
Wolfgang Hossfeld, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)
Michael Niggemann, Fraunhofer-Institut fuer Solare Energiesysteme (Germany)

Published in SPIE Proceedings Vol. 5184:
Physics, Theory, and Applications of Periodic Structures in Optics II
Philippe Lalanne, Editor(s)

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