Light management

Light management

Diffraction effects at periodically structured boundary surfaces
© Fraunhofer IWS Dresden

Diffraction effects at periodically structured boundary surfaces

AFM-picture of DLIP structured TCO (left) and PET substrates with hexagonally aligned geometry and about 2 µm periodicity
© Fraunhofer IWS Dresden

AFM-picture of DLIP structured TCO (left) and PET substrates with hexagonally aligned geometry and about 2 µm periodicity

In collaboration with the IAPP at the TU Dresden, Fraunhofer IWS is researching the efficiency of organic, photonic elements (OPVs and OLEDs) in order to improve them through topographic micro and sub micrometer structures. For that purpose, DLIP is refined into a production technology which allows the fast and low-cost generation of periodic surface structures to control light in- and output.

Topographic microstructures can increase absorption or emission of elements due to diffraction effects and scattering of light. During the research an increase of efficiency of 37 % through hexagonally aligned micro structuring of PET-based OPVs was shown.

Based on these results an appropriate DLIP-system will be designed, which can be integrated into the production chain to fabricate organic solar cells or OLEDs and used for the processing of polymers and/or transparent, conductive oxides (TCO).