Photon Recycling in Perovskite Solar Cells→

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Photon Recycling in Perovskite Solar Cells

A theoretical description of light emission, propagation, and re-absorption in semiconductor multilayer stacks is derived based on the transverse Green’s function of the electromagnetic field in the presence of a complex dielectric. The framework obtained is shown to reproduce the generalized Kirchhoff relations between the luminescent emission from metal halide perovskite slabs under uniform excitation and the slab absorptance of light with an arbitrary angle of incidence. Finally, consistent treatment of re-absorption provides the local rate of secondary photogeneration required for the consideration of photon recycling in an optoelectronic device simulator that includes the effects of charge transport.

Check the full tutorial here: https://www.fluxim.com/photon-recycling-in-perovskite-solar-cells

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Optimization of Charge Transport in Fluorescent Doped TADF OLEDs→

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Optimization of Charge Transport in Fluorescent Doped TADF OLEDs

We present a combined experimental/simulation analysis of a set of 4 OLEDs with 2 systematically varied guest dopants in the EML. A numerical electro-optical model is employed, demonstrating one consistent parameter set that describes both steady-state and AC characteristics of all devices. The model accounts for charge transport, trapping, polar layers, and excitonic loss processes. These are inducing an efficiency roll-off that can be correlated with the shape of the emission zone and the guest dopant concentrations. Furthermore, starting from the resulting parameter set, we show routes for optimized TADF OLDEs with a reduced roll-off.

Check the full discussion here: https://www.fluxim.com/tadf-oled-optimization-excitons

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How much bluer can you tune your blue emitting OLED? →

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How much bluer can you tune your blue emitting OLED?

In this tutorial, we are demonstrating how to use the optical module of Setfos in order to demonstrate how much the color point of a full OLED can be tuned for a given emitter spectrum. Moreover, we compare the efficiency of the color-optimized device with the one that is tuned for the highest outcoupling/radiance and analyze the consequent trade-off between color purity and efficiency.

The same analysis and optimization can be performed for other types of emitters such as quantum dots or perovskites. Despite the narrow emission spectra of these emitters, the optics of such QLEDs and PeLEDs is equal to the well-established OLEDs.

Check the full discussion here: https://www.fluxim.com/optimization-of-a-blue-oled-cavity

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Electro-Thermal Modeling of Thin-Film Solar Cells with LAOSS→

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Electro-Thermal Modeling of Thin-Film Solar Cells with LAOSS

Our 2D + 1D software LAOSS is a perfect tool to understand and improve on different upscaling strategies which combine 1D layer stack with 2D lateral simulations. In this blog post, we will discuss the findings by Matthias Diethelm and his colleagues who used LAOSS to simulate centimeter-sized organic solar cells to understand loss channels and macroscopic defects.

Read the full post here www.fluxim.com/electro-thermal-modeling-of-thin-film-solar-cells

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Hysteresis in Perovskite Solar Cells →

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Hysteresis in Perovskite Solar Cells

In many perovskite solar cells, hysteresis is observed between the forward and reverse current-voltage (IV) scans. This IV curve hysteresis can be problematic for the correct determination of the Power Conversion Efficiency (PCE). While the exact origin of the IV curve hysteresis has remained a topic of debate, it is now widely accepted that mobile ions are the principal cause. However, it is still the subject of ongoing debates about how exactly mobile ions influence the device operation.

In this blog, we are showing how a proper drift-diffusion simulation can help in understanding how mobile ions are affecting the JV characteristics of a perovskite solar cell.

Read the full post here: https://www.fluxim.com/hysteresis-perovskite-solar-cells

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How to perform a detailed analysis of the degradation mechanisms of OLEDs and pero-LEDs→

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How to perform a detailed analysis of the degradation mechanisms of OLEDs and pero-LEDs

Despite the success of OLED displays in commercial products, there are still issues regarding the efficiency and lifetime of these devices. It is of utmost importance to better understand the device physics in general and the origins of degradation in these OLEDs.

In this blog post, we show you an example for which we used our tools Paios and Setfos to understand device limitations and analyze the degradation mechanisms in state-of-the-art sky blue TADF OLED devices.

Read the full post here: https://www.fluxim.com/tadf-oled-degradation

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Enhancement of the External Quantum Efficiency (EQE) of an OLED→

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Enhancement of the External Quantum Efficiency (EQE) of an OLED

The external quantum efficiency (EQE) is the number of photons emitted by an OLED per number of injected charges. Photons are generated in the device emitting layer (EML), but most of the light is not escaping the device because of thee main loss mechanisms: Total Internal Reflection, Absorption Losses and Surface Plasmon Polaritons (SPPs). In this example, we are showing how to use Setfos to optimize the geometry of an OLED towards high light-outcoupling efficiency.

Read the full post here: https://www.fluxim.com/eqe-oled-optimization

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Perovskite-Silicon Tandem Solar Cell Optimize Efficiency with a Fully Coupled Electro-Optical Simulator→

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Perovskite-Silicon Tandem Solar Cell Optimize Efficiency with a Fully Coupled Electro-Optical Simulator

The emerging solar cell technology of perovskite solar cells already reach an efficiency of 25.5%. The advantage of perovskite solar cells is that they absorb light better in the visible part of the spectrum whereas silicon-based solar cells can absorb near-infrared photons as well. This means that by combining these two technologies in tandem multi-junction solar cells, it will be possible to absorb light over a wide range of the spectrum very efficiently. Theoretically, efficiencies up to almost 40% are expected to be possible.

In this blog post, we will show how SETFOS can be used to analyze a tandem solar cell optically as well as electrically. This simulation approach reveals bottlenecks in the optimization and shows pathways for improvement. This study has been presented at the EUPVSEC 2020 by Urs Aeberhard.

Read the full post here: www.fluxim.com/perovskite-silicon-tandem-solar-cell-simulation

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Optimize Micro-Textures for Increased Light Extraction in Flexible, Curved Displays→

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Optimize Micro-Textures for Increased Light Extraction in Flexible, Curved Displays

Flexible electronics have been envisioned to change the way we interact with technology. Flexible circuit boards are already ubiquitous. These applications of flexible electronics are packaged away inside electrical gadgets and instruments and are therefore not visible to the end user. Nevertheless the development of this technology allowed for tighter packed and therefore smaller and still powerful devices. Curved displays are an application of flexible electronics where the user directly interacts with the shaped object and the technological advancement is directly tangible for the end user.

Read the full post here www.fluxim.com/optimize-micro-textures-for-increased-light-extraction-in-flexible-curved-displays

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Quantifying Electro-Optical Cross-Talk in White OLED or Color Filter Displays→

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Quantifying Electro-Optical Cross-Talk in White OLED or Color Filter Displays

The simulation software Laoss can be used to quantitatively analyze optical and electrical cross-talk effects in white organic light-emitting diode (WOLED) / color filter (CF) displays. Optical light leakage is found to be highly influenced by the topography of the pixel definition layer (PDL) while it only shows little correlation with OLED parameters, such as the emitter orientation. Electro-optical simulations exemplify the importance of electrical and optical cross-talk to be dominant in different voltage ranges.

Read the full post here: www.fluxim.com/quantifying-electro-optical-cross-talk-in-white-oled-or-color-filter-displays

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Light Conversion using Perovskite Quantum Dots→

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Light Conversion using Perovskite Quantum Dots

Quantum dots are crystalline semiconductor particles with a size of a few nanometers. The nanocrystal properties are essentially determined by their size.

This blog post will present the main properties of quantum dots and their application. Moreover, it gives an example of how to characterize films with embedded quantum dots using our angular resolved spectrometer Phelos, together with our electro-optical simulation software Setfos.

Check the full discussion here: www.fluxim.com/light-conversion-perovskite-quantum-dots

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Hyperfluorescent OLED Simulation with Setfos→

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Hyperfluorescent OLED Simulation with Setfos

Fluorescence‐based organic light‐emitting diodes (OLEDs) using thermally activated delayed fluorescence (TADF) have increasingly attracted attention in research and industry. Even though the experimental realization of this concept has demonstrated promising external quantum efficiencies, the full potential of this approach has not yet been assessed. To this end, a comprehensive electro‐optical device model accounting for the full exciton dynamics, including triplet harvesting and exciton quenching is presented.

Check the full discussion here: https://www.fluxim.com/tadf-oled-simulation

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Numerical Optimization of Organic and Hybrid Multijunction Solar Cells→

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Numerical Optimization of Organic and Hybrid Multijunction Solar Cells

We present a numerical optimization of organic and hybrid multijunction solar cell devices , using an integrated optoelectronic device simulation approach that captures the essential properties of the complex multilayer structures, such as, light scattering at both macroscopic and rough thin film textures, resonator effects in coherent stacks, and the impact of organic interface properties for the design of efficient recombination layers . The optimization capabilities of the numerical device simulation framework are illustrated in the examples of textured perovskite silicon and all organic tandem solar cells.

Check the full analysis here: https://www.fluxim.com/simulation-multi-junction-solar-cells

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