Fluxim

Fluxim FLUXiM AG provides swiss-made software and hardware for R&D on OLEDs, displays, lighting and solar cells to industry and academia worldwide. In 2006 Prof.

FLUXiM AG is a Swiss company that provides simulation software and measurement hardware for research and development of displays, lighting, and photovoltaic cells in industry and academia. Our company name FLUXiM is derived from flux simulation. Our activity started at the Institute of Computational Physics at the Zurich University of Applied Sciences. Dr Beat Ruhstaller founded FLUXiM as a spin-o

ff company. Our software products Setfos and Laoss are designed to simulate the fundamental operational mechanisms of LEDs and solar cells (organic, perovskites and quantum-dots), also at the large-scale. Light-outcoupling from OLEDs, light-absorption in thin-film solar cells, but also charge generation, transport and recombination in these semiconductor devices are all mechanisms that can be simulated with our software. Setfos and Laoss are simulation software that boosts research and development of OLEDs, displays, lighting panels, solar cells, and photovoltaic arrays. Our hardware products Paios, Phelos and Litos are all-in-one measurement platforms with integrated analysis software for electrical and optical device characterization, parameter extraction, and model validation. We also provide services such as consulting, training, software development, and specific device characterization for prospectives. Check out our references and testimonials for more information about our activities.

It’s not (only) the optical cavity—here’s what really boosts ultrathin-EML hashtag OLEDs.Ultrathin emissive-layer OLEDs ...
23/06/2026

It’s not (only) the optical cavity—here’s what really boosts ultrathin-EML hashtag OLEDs.

Ultrathin emissive-layer OLEDs simplify fabrication by avoiding conventional host–guest co-doping, but placing all recombination and exciton harvesting at one narrow interface can intensify quenching and limit EQE.

In this ACS Applied Electronic Materials study, Edoardo Stanzani together with partners from the University of Valencia (Michele Forzatti, Daniel Tordera, Henk Bolink) and colleagues from Fluxim introduce a ν-DABNA double-emitter architecture for deep-blue OLEDs.

The concept is simple: keep one ultrathin ν-DABNA emitter at the mCP/PO-T2T interface and place a second ultrathin emitter a few nanometers away in the transport layer. This redistributes exciton harvesting and increases peak EQE from 9.6% to 14.2%.

The exciton dynamics and optical effects in the double EML OLED are scrutinized with the help of . Optical Mode Analysis shows that cavity effects are too small to explain the EQE gain, while electro-optical simulations with 1D drift-diffusion and 3D Master Equation modelling link the improvement to FRET-mediated exciton redistribution and reduced losses at the primary recombination zone.

See it for yourself: start a free Setfos trial and test advanced OLED stack designs on your own architecture.

www.fluxim.com/setfos

Congratulations to Edoardo Stanzani who will soon be defending his Ph.D. and all the co-authors on this excellent work.

E. Stanzani, M. Forzatti, S. M. Saiz, D. Tordera, H. J. Bolink, Simon Zeder, Vasileios Georgakopoulos Paltidis , B. Blülle, Beat Ruhstaller, and Sandra Jenatsch, “Enhancing the Efficiency of Ultrathin-EML OLEDs via a Double-Emitter Configuration.” ACS Applied Electronic Materials, 2026. https://doi.org/10.1021/acsaelm.6c00271

And congrats Edoardo on such a nice image!

It's not the interface—here's what really limits /organic solar cells.Integrated perovskite/organic solar cells (I-POSC...
16/06/2026

It's not the interface—here's what really limits /organic solar cells.

Integrated perovskite/organic solar cells (I-POSCs) aim to pair the high voltage of perovskites with extra near infrared current from an organic absorber—without tandem complexity—but interfacial extraction barriers can quickly turn that advantage into S shaped J–V curves and lost fill factor.

In this Advanced Energy Materials study, Jingjing Tian, Larry Lüer, Christoph J. Brabec, and colleagues build a drift–diffusion modeling framework to explain charge transport and recombination in these complex I-POSCs.

They map how perovskite/organic bulk heterojunction (BHJ) energy alignment shifts the balance between photocurrent, photovoltage preservation, and—most critically—fill factor losses associated with extraction barriers and carrier accumulation. They also conclude that BHJ bimolecular recombination is typically the dominant loss channel in current I-POSCs, outweighing interfacial trap-assisted recombination in the modeled regimes.

supports these conclusions, used to reproduce S kinks, intensity-dependent EQE/J–V mismatches, and performance trends while independently varying BHJ bimolecular recombination and interfacial SRH

parameters. In the paper’s conclusions, Setfos is the basis for the key takeaway that reducing BHJ bimolecular recombination can remove kink-driven FF penalties and expose the realistic performance potential of I-POSCs under one sun.

👉 👉 See it for yourself: start a free Setfos trial and reproduce these drift–diffusion results on your own device architecture.

www.fluxim.com/setfos

Congratulations to Jingjing Tian and co-authors on this excellent work!

J. Tian, C. Liu, K. Forberich, R. Wang, L. Lüer, and Christoph Josef Brabec, “Decoding Interfacial Charge-Carrier Dynamics in Integrated Perovskite/Organic Solar Cells via Numerical Modeling.” Advanced Energy Materials16, no. 9 (2026): e04060. https://doi.org/10.1002/aenm.202504060

Emitter orientation is a key parameter in OLED performance.The distribution of dipoles in the emissive layer directly in...
14/06/2026

Emitter orientation is a key parameter in OLED performance.
The distribution of dipoles in the emissive layer directly influences light outcoupling and overall device efficiency.
Yet in many workflows, it is still inferred indirectly or not quantified with sufficient accuracy.

Phelos enables:
✅ Angle- and polarization-resolved PL and EL measurements

✅ Model-based extraction of dipole orientation

✅ Consistent data for optical simulation workflows in Setfos to determine the emission zone in your device

This allows you to move from assumptions to quantitative device understanding, reducing uncertainty in OLED stack design.
If you are working on high-efficiency OLEDs, emitter orientation should be part of your standard characterization

Request a Demo today https://www.fluxim.com/phelos

From Messy Grains to 10.7% EQE NIR-II Perovskite LEDsA tiny molecular additive turns a messy tin-perovskite film into a ...
02/06/2026

From Messy Grains to 10.7% EQE NIR-II Perovskite LEDs

A tiny molecular additive turns a messy tin-perovskite film into a much better LED architecture, and the payoff is unusually strong for NIR-II emission.
By steering crystallization, the authors reshape CsSnI-based perovskite grains from low-lying dendritic networks into elongated island-like structures, which improves charge balance, pushes the recombination zone deeper into the bulk, and lifts performance to 10.7% EQE.

The main idea is that morphology is being used as a device-physics lever, not just a materials tweak. The elongated grains reduce excessive hole injection, lower leakage current, and suppress interfacial recombination, which helps the device keep high brightness with much less efficiency roll-off.

On the characterization side, Paios was used for transient electroluminescence, capacitance-voltage, and impedance measurements, and those measurements support the interpretation of how charge injection and recombination change with morphology.

Read the full hashtag Nature paper here: https://www.fluxim.com/publications-overview/research-paper-elongated-grain-morphology-enables-efficient-nir-ii-sn-perovskite-led

Congratulations to our customers at Huaqiao University, China and choosing Paios.

Guan, X., Li, Y., Su, Y., Meng, Y., Tong, H., Luo, Y., Lin, K., Liu, H., Wang, Y., Li, Y., Zhang, Y., Zhang, Q., Hao, S., Chen, X., Zhang, S., Lu, J., Xie, F., & Wei, Z. (2026). Elongated grain morphology for efficient and radiant NIR-II Sn-based perovskite light-emitting diodes. Nature Communications.

Our 20th webinar is on June the 9th at 10am CEST (4pm CDT) our invited guest, Prof. Martin Stolterfoht from the Chinese...
02/06/2026

Our 20th webinar is on June the 9th at 10am CEST (4pm CDT) our invited guest, Prof. Martin Stolterfoht from the Chinese University of Hong Kong will be presenting a talk on role of mobile ions and shallow traps in governing degradation losses in perovskite solar cells. Register here: 838e135b-92ba-45b8-8a9f-0dc6131925f8@edaecfd0-eb6b-4e07-b7ed-3a0e8fbf5d0c" rel="ugc" target="_blank">https://events.teams.microsoft.com/event/838e135b-92ba-45b8-8a9f-0dc6131925f8@edaecfd0-eb6b-4e07-b7ed-3a0e8fbf5d0c

Sunday ReadWhy can quantum dots emit different colours from the same type of material?In our research blog, we look at l...
24/05/2026

Sunday Read

Why can quantum dots emit different colours from the same type of material?

In our research blog, we look at light conversion using perovskite quantum dots and explain how their nanoscale size controls their optical behaviour.

The article covers how quantum dots can absorb higher-energy light and re-emit lower-energy photons, why this matters for display technology, and how perovskite quantum dot films can be characterized and simulated.

We also show how from Fluxim can be used for angular-resolved EL and PL measurements, and how our simulation software can model absorption, re-emission, and scattering in quantum dot films using ray tracing.

A useful read for researchers working on displays, OLEDs, quantum dots, light conversion, and optical device simulation.

Read the blog here: https://www.fluxim.com/research-blogs/light-conversion-perovskite-quantum-dots

Call for abstracts.SIMOEP 2026 brings together researchers working at the interface of modelling, measurement, and chara...
21/05/2026

Call for abstracts.

SIMOEP 2026 brings together researchers working at the interface of modelling, measurement, and characterization of emerging optoelectronic and photovoltaic devices.

The programme is already taking shape, with confirmed talks covering OLEDs, organic electronics, perovskite solar cells, perovskite-silicon tandems, impedance spectroscopy, device degradation, and advanced characterization.

A sincere thank you to the confirmed speakers:

Philip Calado, Nicola Courtier, Quentin Jeangros, Andreas Mischok, Mathias Nyman, Jens Pflaum, Sonia Ruiz Raga, Ji-Youn Seo, Koen Vandewael, Paola Vivo, Matthias Diethelm, Sandra Jenatsch, Davide Moia, Christoph Kirsch, and Evelyne Knapp.

We look forward to a focused scientific exchange and to welcoming the community to SIMOEP 2026.

There is still time to submit an abstract, dead-line is June 5th.

Register here: https://www.zhaw.ch/de/engineering/institute-zentren/icp/veranstaltungen/simoep

How do mobile ions and shallow traps contribute to degradation losses in perovskite solar cells?Join us for Fluxim’s 20t...
19/05/2026

How do mobile ions and shallow traps contribute to degradation losses in perovskite solar cells?

Join us for Fluxim’s 20th webinar with invited speaker Prof. Martin Stolterfoht, Vice-Chancellor Associate Professor in the Department of Electronic Engineering at The Chinese University of Hong Kong 香港中文大學 - CUHK.

Prof. Stolterfoht leads the Photon Energy Conversion Lab at CUHK, where his group works on understanding and improving the stability of perovskite-based solar cells and related optoelectronic devices.

He will present:

The role of mobile ions and shallow traps in governing degradation losses in perovskite solar cells

Following his presentation, Dr. Matthias Diethelm from Fluxim will give a talk on:

Ion parameter extraction in perovskite solar cells

📅 Tuesday, 9 June 2026
🕙 10:00-11:00 CEST
🕓 16:00-17:00 Hong Kong Time

This webinar is relevant for researchers working on perovskite solar cells, tandem photovoltaics, device stability, ion migration, and optoelectronic characterization.

Register here:838e135b-92ba-45b8-8a9f-0dc6131925f8@edaecfd0-eb6b-4e07-b7ed-3a0e8fbf5d0c" rel="ugc" target="_blank">https://events.teams.microsoft.com/event/838e135b-92ba-45b8-8a9f-0dc6131925f8@edaecfd0-eb6b-4e07-b7ed-3a0e8fbf5d0c

Adresse

Katharina Sulzer Platz 2
Winterthur
8400

Öffnungszeiten

Montag 09:00 - 17:00
Dienstag 09:00 - 17:00
Mittwoch 09:00 - 17:00
Donnerstag 09:00 - 17:00
Freitag 09:00 - 17:00

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+41445004770

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