Optoelectronics lab course at CAU

Optoelectronics lab course at CAU

In the course of the bi-annual optoelectronics internship, master students had the possibility to independently design, produce and measure organic solar cells (OPV) and organic light-emitting diodes in the 2017 summer semester. This time, the students visited the premises of the Mads Clausen Institute at SDU within one day of the test and were thus able to get to know the Danish university and its methods for OPV characterization and to study their self-built solar cells. This measuring day will now be firmly integrated into the syllabus, thus promoting the cross-border exchange of competences.

More information about the lab course on CAU’s homepage.

Organic optoelectronics in fluorescence measurement technology

OLED-OPV sensor

OLED-OPV sensorScientists from Kiel University (CAU) have investigated the possibility of using organic optoelectronics in the field of measurement technology. The goal is to integrate OLEDs and OPVs on a chip for the development of future lab-on-chip system for fluorescence detection. In a first proof-of-principle experiment, organic light-emitting diodes and organic solar cells in various designs were realized on a substrate in the clean room of the Kieler Nanolabor and initial fluorescence measurements were carried out. These results were presented in a lecture at the XXXI. Messtechnisches Symposium des Arbeitskreises der Hochschullehrer für Messtechnik (S. Jahns, J. Balke, A.F. Iwers, M. Gerken: Organic optoelectronics for lab-on-chip fluorescence detection, Proceedings AHMT 2017).

Simulation model shows influence of grid structure on emission characteristics of OLEDs

By introducing nano- and microstructures into organic solar cells (OPV) and organic light-emitting diodes (OLED), CAU scientists want to specifically influence the properties of the components. For this purpose, a simulation model was implemented with which the influence of grid structures on the emission characteristic of an OLED can be investigated. In a first study it was investigated both theoretically and experimentally, how the structures of the grid, absorption effects within the nanostructured OLED and the layer thickness of the cathode affect the light extraction. The results were presented in an abstract at the conference International Conference on Electromagnetics in Advanced Applications 2017 (H. Lüder, M. Bremer, M. Gerken, Simulation of nanostructured emission layers for tailoring the angular radiation pattern of OLEDs, Proceedings ICEAA 2017).

Inline print of silver thinfilm coatings

During the RollFlex project, Stensborg A / S has developed a new printing technology that makes it possible to make ultra-thin silver film coatings on different materials, such as, e.g., plastic film and glass. The thickness of these silver coatings is assumed to be about 25 nm. The process is particularly interesting for RollFlex for the R2R production of solar cells and OLEDs developed in the project because it can be used in different ways to improve the performance of the manufactured components. Thus, for example, optical diffraction gratings made with the R2R process significantly improve the light efficiency of the components due to the conformal silver coating applied in the printing process to this type of nano-surface relief structures. Similarly, with the new technology, it is possible to print circuit board tracks in different patterns. Both stages of the process are necessary for the production of solar cells and LEDs in the project.

In summary, the technology offers the following:

  • Print-to-roll and scroll-to-plate printing
  • Quick and flexible development of component prototypes
  • Scalable production from single pieces to volume production
  • Simple modification of printed metal patterns in volume production

In the case of print of electrically conductive layers, the printer system requires only a bitmap input file. The thin silver film has a resistivity of about 7.55 · 10ˆ-8Ωm.

The technology will be implemented on the industrial NIL platform, which Stensborg A/S has developed and sells under the name HoloPrint ©

Kiel University live 2017: RollFlex at the Kieler Woche

On 21 to 22 June, the team from Kiel University was present at the Kieler Woche 2017 in the course of Kieler Uni live and presented research results and technologies from the project by showing media and show-and-tell objects. At a measuring stand, younger and older visitors had the possibility to test the function of small solar cells. Furthermore, they could have a closer look at OLEDs and flexible solar cells in different designs, a model for a roll-to-roll print facility, as well as nano- and microstructured foils.

The visitors’ showed a strong interest in the idea and the technology of the project. Overall tenor: Yes, also here in Northern Germany and Southern Denmark we can do high-tech research!
















RollFlex for girls at Girls’ Day

RollFlex for girls at Girls’ Day

On April 27, 2017, the Technical Faculty of Kiel University organized a Girls’ Day. The Institutes for Electrical Engineering and Information Technology, Computer Science and Materials Science had invited and 50 students took the opportunity to take an active look. As part of the event, 5th and 6th grade students at the Institute of Electrical Engineering and Information Technology were able to create a brightly coloured LED globe. In a short lecture on How to make wallpapers light up and in the subsequent independent soldering and producing the light balls, the girls could be inspired for the technology.

Popular science & peer-reviewed research articles

Popular science & peer-reviewed research articles
Publications in English

Realizing 8 cd A−1 Current Efficiency for Solution-Processed Inverted Top-Emitting Polymer Light-Emitting Diodes Y. Murat, H. Lüder, M. Köpke, J. Buhl, M. Gerken, Journal of Electronic Materials 50 (2021) 2556

Identification of degradation mechanisms in slot-die coated non-fullerene ITO-free organic solar cells using different illumination spectra
B. Arredondo, G. del Pozo, E. Hernández-Balaguera, D. Martín-Martín, M. C. López-González, B. Romero, E. López-Fraguas, R. Vergaz, X. Quintana, J. Lamminaho, E. Destouesse, M. Ahmadpour, V. Turkovic, M. Madsen. ACS Appl. Energy Mater. 3, 7 (2020) 6476

Degradation behaviour of scalable non-fullerene organic solar cells assessed by outdoor and indoor ISOS stability protocols. W. Greenbank, N. Djeddaoui, E. Destouesse, J. Lamminaho, M. Prete, L. Boukezzi, T. Ebel, L. Bessissa, H.-G. Rubahn, V. Turkovic, M. Madsen. Energy Technology (2020)

All solution-processed ITO free flexible organic light-emitting diodes
Y. Murat, K. Petersons, D. Lanka, L. Lindvold, L. Yde, J. Stensborg, M. Gerken, Materials Advances 1 (2020) 2755

OLED OPD Matrix for Sensing on a Single Flexible Substrate
I. Titov, M. Köpke, N. Schneidewind, J. Buhl, Y. Murat, M. Gerken, IEEE Sensors Journal, 20, (2020) 14

Photonic crystal slab between orthogonal polarizers: details on the guided mode resonance wavelength
H. Lüder, M. Paulsen, M. Gerken, Optical and Quantum Electronics 52 (2020) 180

Refractive Index Measurement with a Flexible OLED-OPD Detection Unit. I. Titov, M. Köpke and M. Gerken,
Proc. 2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)  1 (2020)

Localized Emission Centres in Nanostructured Emission Layers for an Increased Resonance-to-Background Ratio.
H. Lüder, P. Kreutzkamm, Y. Murat, and M. Gerken, OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) OSA Technical Digest (Optical Society of America, 2020), paper JTh3G.2

Slot-die processing and encapsulation of non-fullerene based ITO-free organic solar cells and modules E. Destouesse, M. Top, J. Lamminaho, H.-G. Rubahn, J. Fahlteich and M. Madsen, Flex. Print. Electron, 4 (2019) 045004

Inverted organic solar cells with non-clustering bathocuproine (BCP) cathode interlayers obtained by fullerene doping F. Jafari, B. R. Patil, F. Mohtaram, A. L. F. Cauduro, H.-G. Rubahn, A. Behjat and M. Madsen, Sci. Rep., 9 (2019) 10422

Towards solution-processed top-emitting OLEDs using a phosphorescent iridium complex Y. Murat, D. K. Subramanian, A. V. Lakshmanan, M. Gerken, 21st International Conference on Transparent Optical Networks, Angers, France, 09.-13.07.2019

FDTD modelling of nanostructured OLEDs: analysis of simulation parameters for accurate radiation patterns H. Lüder, M. Gerken, Optical and Quantum Electronics, vol 51 (2019) 139

OLED-OPD Matrix for Fluorescence Sensing on a Single Flexible Substrate N. Schneidewind, M. Köpke, J. Buhl, Y. Murat, M. Gerken, IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS) (2019)

Highly performant organic top-emitting light-emitting diodes (OLEDs) by solution process Y. Murat, H. Lüder, M. Gerken, Proc. Light, Energy and the Environment Congress, pp. SW2D-1 (2018)

Area-dependent behavior of bathocuproine (BCP) as cathode interfacial layers in organic photovoltaic cells Bhushan R. Patil, Mehrad Ahmadpour, Golnaz Sherafatipour, Talha Qamar, Antón F. Fernández, Karin Zojer, Horst-Günter Rubahn & Morten Madsen, Nature Scientific Reports (2018)

Dynamics of photoinduced degradation of perovskite photovoltaics: from reversible to irreversible processes M. V. Khenkin, et. al. , ACS Appl. Energy Mater., 1, 2 (2018) 799

Reconsidering Figures of Merit for the Performance and Stability of Perovskite Photovoltaics M. V. Khenkin, et. al., Energy Environ. Sci., 11 (2018) 739

Modeling Multi-junction Solar Cells by Non-Local Tunneling and Sub-Cell Analysis. Y. Liu, M. Ahmadpour, J. Adam, J. Kjelstrup-Hansen, H.-G. Rubahn, M. Madsen, IEEE J. Photovolt., 8 (2018) 1363

Cu(II) and Zn(II) based Phthalocyanine as Hole selective layers for Perovskite Solar Cells L. Calio, et. al., Sustainable Energy Fuels, 1 (2017) 2071

Simulation methods for multiperiodic and aperiodic nanostructured dielectric waveguides Paulsen, L. T. Neustock, S. Jahns, J. Adam, M. Gerken, Opt. Quant Electron., 49 (2017) 107

Simulation of nanostructured emission layers for tailoring the angular radiation pattern of OLEDs. Lüder, M. Bremer, M. Gerken, Proc. International Conference on Electromagnetics in Advanced Applications (2017)

Organic optoelectronics for lab-on-chip fluorescence detection
S. Jahns, A. F. K. Iwers, J. Balke, and M. Gerken, tm – Tech. Mess., vol. 84(s1) (2017) 48

ITO with embedded silver grids as transparent conductive electrodes for large area organic solar cells R. Patil, M. Mirsafaei, P. P. Cielecki, A. L. F. Cauduro, J. Fiutowski, H.-G. Rubahn and M. Madsen, Nanotechnology, 28 (2017) 405303

4P-NPD ultra thin-films as efficient exciton blocking layers in inverted DBP/C70 based organic solar cells B. R. Patil et al., J. Phys. D: Appl. Phys., 50 (2017) 385101

Current Matching in Multifold DBP/C70 Organic Solar Cells with Open Circuit Voltages of up to 6.44 V M. Ahmadpour et al., IEEE J. Photovolt., 7 (2017) 1319

The influence of electrical effects on device performance of organic solar cells with nano-structured electrodes M. Mirsafaei et al., Sci. Rep., 7 (2017) 5300

Tetrapodal ZnO Particles for Substrate Mode Scattering in Flexible Organic Light-Emitting Diodes M. Bremer, A. Cojocaru, I. Hölken, I. Paulowicz, M. Köpke, R. Adelung, H. Schmidt-Niepenberg, and M. Gerken. Light, Energy and the Environment, OSA Technical Digest (online) Optical Society of America (2016), paper JW4A.8

Publications in German

Produkte von der Stange? Nein, von der Rolle
NINa-Newsletter 6/2017

Publications in Danish

Printede solceller som hvermandseje
Aktuel Naturvidenskab Nr. 6, 2016 | Kort nyt, s. 4 | Birgitte Dalgaard, SDU