Matthias Diethelm
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View article: Enhancing photocurrent collection in wide-gap ACIGS solar cells
Enhancing photocurrent collection in wide-gap ACIGS solar cells Open
Chalcopyrite solar cells utilising (Ag,Cu)(In,Ga)Se 2 (ACIGS) absorbers have demonstrated cell efficiencies approaching 24% and adjustable band gaps between 1.0 and 1.7 eV, rendering them a promising material for tandem solar cells. The in…
View article: Probing ionic conductivity and electric field screening in perovskite solar cells: a novel exploration through ion drift currents
Probing ionic conductivity and electric field screening in perovskite solar cells: a novel exploration through ion drift currents Open
This study introduces a new method to analyse mobile ion-related processes in metal halide perovskite devices, which reveals how ion conductivity determines electric field screening and provides new insights into the mixed ionic–electronic…
View article: Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices
Photomultiplication Enabling Efficient Shortwave Infrared‐Sensitive Organic Upconversion Devices Open
Organic upconverters made by integrating an infrared‐sensitive photodetector with a light‐emitting diode offer a low‐cost route to visualize images taken in the infrared. However, making such devices sufficiently efficient is challenging. …
View article: Unveiling the GeI<sub>2</sub>‐Assisted Oriented Growth of Perovskite Crystallite for High‐Performance Flexible Sn Perovskite Solar Cells
Unveiling the GeI<sub>2</sub>‐Assisted Oriented Growth of Perovskite Crystallite for High‐Performance Flexible Sn Perovskite Solar Cells Open
Tin perovskites are emerging as promising alternatives to their lead‐based counterparts for high‐performance and flexible perovskite solar cells. However, their rapid crystallization often leads to inadequate film quality and poor device p…
View article: Unveiling the GeI2-Assisted Oriented Growth of Perovskite Crystallite for High-Performance Flexible Sn Perovskite Solar Cells
Unveiling the GeI2-Assisted Oriented Growth of Perovskite Crystallite for High-Performance Flexible Sn Perovskite Solar Cells Open
Tin perovskites are emerging as promising alternatives to their lead-based counterparts for high-performance and flexible perovskite solar cells (PSCs). However, their rapid crystallization often leads to inadequate film quality and poor d…
View article: Formation of electron traps in semiconducting polymers via a slow triple-encounter between trap precursor particles
Formation of electron traps in semiconducting polymers via a slow triple-encounter between trap precursor particles Open
Already in 2012, Blom et al. reported (Nature Materials 2012, 11, 882) in semiconducting polymers on a general electron-trap density of ≈3 × 1017 cm-3, centered at an energy of ≈3.6 eV below vacuum. It was suggested that traps have an extr…
View article: Traps for Electrons and Holes Limit the Efficiency and Durability of Polymer Light‐Emitting Electrochemical Cells
Traps for Electrons and Holes Limit the Efficiency and Durability of Polymer Light‐Emitting Electrochemical Cells Open
Polymer light‐emitting electrochemical cells (PLECs) and light‐emitting diodes (PLEDs) receive interest for large‐area lighting and signage applications. During operation of a PLEC, a p–i–n junction develops where electrons and holes are i…
View article: On the Response Speed of Narrowband Organic Optical Upconversion Devices
On the Response Speed of Narrowband Organic Optical Upconversion Devices Open
Organic upconversion devices (OUCs) consist of an organic infrared photodetector and an organic visible light‐emitting diode (OLED), connected in series. OUCs convert photons from the infrared to the visible and are of use in applications …
View article: Electron Trap Dynamics in Polymer Light‐Emitting Diodes
Electron Trap Dynamics in Polymer Light‐Emitting Diodes Open
Semiconducting polymers are being studied intensively for optoelectronic device applications, including solution‐processed light‐emitting diodes (PLEDs). Charge traps in polymers limit the charge transport and thus the PLED efficiency. It …
View article: Carrier Tunneling from Charge Transfer States in Organic Photovoltaic Cells
Carrier Tunneling from Charge Transfer States in Organic Photovoltaic Cells Open
Charge transfer (CT) states play a key role in the functioning of organic solar cells; however, understanding the mechanism by which CT states dissociate efficiently into free charges remain a conceptual challenge. Here, the electric field…
View article: Ion and Trap Induced Dynamic Phenomena in Salt Semiconductor Devices
Ion and Trap Induced Dynamic Phenomena in Salt Semiconductor Devices Open
State-of-the-art organic light-emitting diodes (OLEDs) used in commercial display technology are complex multilayer structures. In contrast, the light-emitting electrochemical cell (LEC) can be built from a single emissive layer sandwiched…
View article: The Dynamic Emission Zone in Sandwich Polymer Light‐Emitting Electrochemical Cells
The Dynamic Emission Zone in Sandwich Polymer Light‐Emitting Electrochemical Cells Open
In light‐emitting electrochemical cells (LECs), the position of the emission zone (EZ) is not predefined via a multilayer architecture design, but governed by a complex motion of electrical and ionic charges. As a result of the evolution o…
View article: Solution-Processed Organic Optical Upconversion Device
Solution-Processed Organic Optical Upconversion Device Open
Imaging in the near-infrared (NIR) is getting increasingly important for applications such as machine vision or medical imaging. NIR-to-visible optical upconverters consist of a monolithic stack of a NIR photodetector and a visible light-e…
View article: Exploiting supramolecular assemblies for filterless ultra-narrowband organic photodetectors with inkjet fabrication capability
Exploiting supramolecular assemblies for filterless ultra-narrowband organic photodetectors with inkjet fabrication capability Open
Strongly coupled dye molecules are known to produce narrowband absorption in a large spectral range. Here we exploit this feature to achieve organic photodetectors with ultra-narrow full-width at half-maximum response at low bias voltage.
View article: Optimized Electrolyte Loading and Active Film Thickness for Sandwich Polymer Light‐Emitting Electrochemical Cells
Optimized Electrolyte Loading and Active Film Thickness for Sandwich Polymer Light‐Emitting Electrochemical Cells Open
Effects of ion concentration and active layer thickness play a critical role on the performance of light‐emitting electrochemical cells. Expanding on a pioneering materials system comprising the super yellow (SY) polymer and the electrolyt…
View article: Dynamics of Charge Distribution in Sandwich-Type Light-Emitting Electrochemical Cells Probed by the Stark Effect
Dynamics of Charge Distribution in Sandwich-Type Light-Emitting Electrochemical Cells Probed by the Stark Effect Open
A sandwich-type structure composed of thin films of functional materials is the dominant architecture of organic optoelectronic devices. During device operation, injected or inside-generated electrical charges arrange in a specific spatial…
View article: Squaraine Dye for a Visibly Transparent All-Organic Optical Upconversion Device with Sensitivity at 1000 nm
Squaraine Dye for a Visibly Transparent All-Organic Optical Upconversion Device with Sensitivity at 1000 nm Open
Efficient light detection in the near-infrared (NIR) wavelength region is central to emerging applications such as medical imaging and machine vision. An organic upconverter (OUC) consists of a NIR-sensitive organic photodetector (OPD) and…
View article: Quantitative analysis of pixel crosstalk in AMOLED displays
Quantitative analysis of pixel crosstalk in AMOLED displays Open
The resolution of organic light-emitting diode (OLED) displays is increasing steadily as these displays are adopted for mobile and virtual reality (VR) devices. This leads to a stronger pixel crosstalk effect, where the neighbors of active…
View article: Time-Dependent p–i–n Structure and Emission Zone in Sandwich-Type Light-Emitting Electrochemical Cells
Time-Dependent p–i–n Structure and Emission Zone in Sandwich-Type Light-Emitting Electrochemical Cells Open
Light-emitting electrochemical cells (LECs) are one of the simplest electroluminescent devices and consist of a single emissive organic/salt layer sandwiched between two electrodes. The unique attribute of an operated LEC is the developmen…
View article: Quantitative analysis of pixel crosstalk in AMOLED displays
Quantitative analysis of pixel crosstalk in AMOLED displays Open
The resolution of organic light-emitting diode (OLED) displays is increasing steadily as these displays are adopted for mobile and virtual reality (VR) devices. This leads to a stronger pixel crosstalk effect, where the neighbors of active…