# 09 - Light management by disordered nano-structures for optoelectronic devices (LAMBDA)

**Source**: https://www.cs.tum.de/spp1839/projects/1st-period-2015-2018/09.html
**Parent**: https://www.cs.tum.de/spp1839/projects.html

The present proposal falls into the field of
light management for optoelectronic thin film devices using 2D planar
disordered nano-structures. The latter are designed to act as an
efficient scattering architecture whose main goal is to improve the
outcoupling properties of white organic light emitting diodes (WOLEDs),
and consequently to increase their power efficiency. The methodology
and structures developed here will also have direct implications for
the field of photovoltaics. Thus, it is planned to test the engineered
structures to ameliorate the light-trapping capabilities of amorphous
silicon thin-film solar cells, which possess a comparable spectral range
of operation as WOLEDs.As a prerequisite for any experimental
investigations, a mature fabrication route for the creation of photonic
structures with controllable disorder properties will be established
using a versatile, large area, wet-chemical technique based on lateral
phase separation. In order to optimize the structures produced, a novel
optical modeling method will be developed enabling the rigorous
calculation of the scattering by a large ensemble of cylindrical
scattering centers embedded in a thin film system with low computational
resources demands. It will also be used in combination with advanced
techniques of scanning near-field optical microscopy to provide further
insights into the physical mechanisms at play. The information derived
from those analyses will facilitate the integration of the scattering
layers into the two targeted devices, and their impact in terms of
efficiency increase will be measured.Within the scope of this
interdisciplinary experimental/ theoretical study, specific questions
related to light scattering by planar pseudo-disordered structures
inside thin films systems are addressed, and encompass the influence of
those layers on coherent multi-scattering phenomena, on the excitons
life time or on the extraction of surface plasmon polaritons.

## Contributors

- [Dr. Karsten Bittkau](http://www.fz-juelich.de/SharedDocs/Personen/IEK/IEK-5/EN/k.bittkau.html "Opens internal link in current window")
- [Dr.-Ing. Guillaume Gomard](https://www.lti.kit.edu/mitarbeiter_6559.php "Opens internal link in current window")

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