Norbert Koch
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View article: Partially Exfoliated and Oxidized V <sub>2</sub> CT <sub>x</sub> MXene as a Beneficial Support for the Oxygen Evolution Reaction
Partially Exfoliated and Oxidized V <sub>2</sub> CT <sub>x</sub> MXene as a Beneficial Support for the Oxygen Evolution Reaction Open
The oxygen evolution reaction (OER) is a critical bottleneck in water‐splitting technologies. Hence, developing efficient and stable OER electrocatalysts is one of the key parameters to improve this technology. Recently, MXenes such as Ti …
View article: A novel <i>n</i>‐type dimer dopant for semiconducting polymers
A novel <i>n</i>‐type dimer dopant for semiconducting polymers Open
Efficient and stable doping of organic semiconductors is crucial for adjusting their electrical properties. This work focuses on a novel n ‐type dopant which releases two electrons per dopant molecule. The dopant's capability was tested wi…
View article: Atomic-Scale Electric Potential Landscape across Molecularly Gated Bilayer MoS<sub>2</sub> Resolved by Photoemission
Atomic-Scale Electric Potential Landscape across Molecularly Gated Bilayer MoS<sub>2</sub> Resolved by Photoemission Open
Electric gating in atomically thin field-effect devices based on transition-metal dichalcogenides has recently been employed to manipulate their excitonic states, even producing exotic phases of matter, such as an excitonic insulator or Bo…
View article: Optimizing Carrier Balance in CsPbBr<sub>3</sub> Nanocrystal LEDs: The Role of Alkyl Ligands and Polar Electron Transport Layers
Optimizing Carrier Balance in CsPbBr<sub>3</sub> Nanocrystal LEDs: The Role of Alkyl Ligands and Polar Electron Transport Layers Open
The study of lead halide perovskite nanocrystal based light‐emitting diodes (LEDs) has advanced significantly, with notable improvements in stability and optical properties. However, optimizing charge carrier injection and transport remain…
View article: SnS Anodes with High Volumetric Capacity for Na‐ion Batteries and Their Characterization in Ether and Ester Electrolytes
SnS Anodes with High Volumetric Capacity for Na‐ion Batteries and Their Characterization in Ether and Ester Electrolytes Open
A current limitation to improving the volumetric energy density of Na‐ion batteries is the low density of the hard carbon(HC) anode. This problem can be solved by using high‐density, high‐capacity materials like SnS, which reacts with Na o…
View article: Compositional Engineering of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene-NiMoO<sub>4</sub> Hybrid Nanostructures for Enhanced Electrocatalytic Water Oxidation
Compositional Engineering of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene-NiMoO<sub>4</sub> Hybrid Nanostructures for Enhanced Electrocatalytic Water Oxidation Open
A critical step in realizing the vision of green hydrogen through water splitting is to design oxygen evolution reaction (OER) catalysts that showcase a good balance of activity and stability. This work reports the compositional tuning of …
View article: DMSO-Free Tin Halide Perovskites for Indoor Photovoltaics
DMSO-Free Tin Halide Perovskites for Indoor Photovoltaics Open
Indoor photovoltaic (IPV) technology has emerged as an effective strategy to sustainably power batteryless Internet of Things (IoT) devices. Though tin perovskite solar cells offer competitive IPV performance, their effectiveness is often …
View article: Phenothiazine‐Based Self‐Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells
Phenothiazine‐Based Self‐Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells Open
Self‐assembled monolayers (SAMs) have revolutionized the fabrication of lead‐based perovskite solar cells, but they still remain underexplored in tin perovskite systems. To date, PEDOT remains the most effective hole‐selective layer in tin…
View article: Origin and Role of Reactive Oxygen Species in UV‐PUDEL Irradiation of Platinum Nanoparticles: Effects on Surface Groups and Electrochemical Activity
Origin and Role of Reactive Oxygen Species in UV‐PUDEL Irradiation of Platinum Nanoparticles: Effects on Surface Groups and Electrochemical Activity Open
The performance of heterogeneous catalysts is governed by their physicochemical surface properties, requiring respective engineering strategies. Pulsed laser defect engineering in liquid (PUDEL) has emerged as a scalable green technology t…
View article: Breaking Barriers: Centimeter‐Sized Single Layer WSe<sub>2</sub> by Gold‐Mediated Exfoliation for Ambipolar Field Effect Transistors at Ultra‐Low Voltages
Breaking Barriers: Centimeter‐Sized Single Layer WSe<sub>2</sub> by Gold‐Mediated Exfoliation for Ambipolar Field Effect Transistors at Ultra‐Low Voltages Open
Transition Metal Dichalcogenides (TMDCs) are promising semiconductor alternatives to silicon in CMOS technology. Their layered nature allows scaling to a single layer (1L) without degrading electrical performance, enabling further miniatur…
View article: Minimizing Recombination at the Perovskite/C<sub>60</sub> Interface through a Volatile Highly Dense Molecular Interlayer
Minimizing Recombination at the Perovskite/C<sub>60</sub> Interface through a Volatile Highly Dense Molecular Interlayer Open
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View article: Tailored Crystallization Dynamics for Efficient and Stable DMSO‐Free Tin Perovskite Solar Cells
Tailored Crystallization Dynamics for Efficient and Stable DMSO‐Free Tin Perovskite Solar Cells Open
Tin perovskite solar cells are emerging as a sustainable lead‐free alternative in thin film photovoltaics. DMSO‐free processed tin perovskites are gaining interest due to the detrimental effects of DMSO on tin oxidation. However, replacing…
View article: The Impact of Gas Cluster Ion Beam Sputtering on the Chemical and Electronic Structure of Methyl Ammonium Lead Iodide Thin Films
The Impact of Gas Cluster Ion Beam Sputtering on the Chemical and Electronic Structure of Methyl Ammonium Lead Iodide Thin Films Open
The stability and performance of metal halide perovskite (MHP) optoelectronic devices are significantly influenced by the chemical and electronic properties of their interfaces, often studied using photoelectron spectroscopy (PES). MHP fil…
View article: Local Fermi Level Engineering in 2D‐MoS<sub>2</sub> Realized via Microcontact Printing of Self‐Assembled Monolayers for Next‐Generation Electronics
Local Fermi Level Engineering in 2D‐MoS<sub>2</sub> Realized via Microcontact Printing of Self‐Assembled Monolayers for Next‐Generation Electronics Open
Silicon‐based technology is approaching scalability limits due to severe short‐channel effects arising from its intrinsic bulk properties. In contrast, two‐dimensional (2D) transition metal dichalcogenides (TMDCs) exhibit remarkable resili…
View article: Enhancing CoFe Catalysts with V<sub>2</sub>CT<sub>X</sub> MXene‐Derived Materials for Anion Exchange Membrane Electrolyzers
Enhancing CoFe Catalysts with V<sub>2</sub>CT<sub>X</sub> MXene‐Derived Materials for Anion Exchange Membrane Electrolyzers Open
Herein, the synthesis and characterization of Co 0.66 Fe 0.34 layered double hydroxides (LDH) derived from pure and vacancy‐engineered V 2 CT x MXenes and their use as electrocatalysts for the oxygen evolution reaction (OER) is reported. T…
View article: Partially Exfoliated and Oxidized V2CTx MXene as a Beneficial Support for the Oxygen Evolution Reaction
Partially Exfoliated and Oxidized V2CTx MXene as a Beneficial Support for the Oxygen Evolution Reaction Open
The oxygen evolution reaction (OER) plays a critical role in water-splitting technologies. Hence, developing efficient and stable OER electrocatalysts is one of the key parameters to improve this technology. Recently, MXenes, such as Ti₃C₂…
View article: Light-Induced Electronic Band Realignment at the Metal Halide Perovskite/Monolayer MoS<sub>2</sub> Heterojunction
Light-Induced Electronic Band Realignment at the Metal Halide Perovskite/Monolayer MoS<sub>2</sub> Heterojunction Open
van der Waals (vdW) heterojunctions offer many routes for advanced interface engineering toward superior optoelectronic functionality. To this end, the combination of 2D transition metal dichalcogenides (TMDCs) with metal halide perovskite…
View article: Ultrawide bandgap spinel <i>γ</i>-(Ga0.8Ge0.2)2O3 alloy semiconductor epitaxial thin films
Ultrawide bandgap spinel <i>γ</i>-(Ga0.8Ge0.2)2O3 alloy semiconductor epitaxial thin films Open
Epitaxial growth of phase-pure and high-quality spinel γ-Ga2O3-based semiconductor thin films has been a big challenge for fundamental research on metastable defective inverse spinel γ-Ga2O3 semiconductors in view of potential device appli…
View article: Crystal Engineering in Oligorylenes: The Quest for Optimized Crystal Packing and Enhanced Charge Transport
Crystal Engineering in Oligorylenes: The Quest for Optimized Crystal Packing and Enhanced Charge Transport Open
The crystal structures of organic semiconductors are critical when they are integrated into optoelectronic devices, such as organic field-effect transistors (OFETs). In this study, we introduce a crystal engineering approach that leverages…
View article: Toward Ultrawide Bandgap Engineering: Physical Properties of an α‐(Ti <sub> <i>x</i> </sub> Ga <sub> 1− <i>x</i> </sub> ) <sub>2</sub> O <sub>3</sub> Material Library
Toward Ultrawide Bandgap Engineering: Physical Properties of an α‐(Ti <sub> <i>x</i> </sub> Ga <sub> 1− <i>x</i> </sub> ) <sub>2</sub> O <sub>3</sub> Material Library Open
Due to its high bandgap of 5.3–5.6 eV and high predicted breakdown field of 10 MV cm −1 , much attention is drawn to the ultrawide bandgap semiconductor α‐Ga 2 O 3 for applications in high‐power and solar blind optoelectronic devices. In c…
View article: Understanding the Role of Varying Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene in Ni/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> for the Oxygen Evolution Reaction
Understanding the Role of Varying Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene in Ni/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> for the Oxygen Evolution Reaction Open
The current state‐of‐the‐art catalysts for the oxygen evolution reaction (OER) in an anion exchange membrane (AEM) electrolyser are not efficient enough to surpass green H 2 produced by other electrolyser technologies, such as Proton Excha…
View article: Phenothiazine-Based Self-Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells
Phenothiazine-Based Self-Assembled Monolayer with Thiophene Head Groups Minimizes Buried Interface Losses in Tin Perovskite Solar Cells Open
Self-assembled monolayers (SAMs) have revolutionized the fabrication of lead-based perovskite solar cells, but they remain underexplored in tin perovskite systems. PEDOT is the material of choice for hole-selective layers in tin perovskite…
View article: Toward Understanding the Built-in Field in Perovskite Solar Cells through Layer-by-Layer Surface Photovoltage Measurements
Toward Understanding the Built-in Field in Perovskite Solar Cells through Layer-by-Layer Surface Photovoltage Measurements Open
The built-in voltage (VBI) is a key parameter for solar cell operation, yet in perovskite solar cells the distribution, magnitude, and origin of the VBI remains poorly understood. In this work, we systematically studied the VBI in pin-type…
View article: Two Isomeric Thienoacenes in Thin Films: Unveiling the Influence of Molecular Structure and Intermolecular Packing on Electronic Properties
Two Isomeric Thienoacenes in Thin Films: Unveiling the Influence of Molecular Structure and Intermolecular Packing on Electronic Properties Open
Isomerism of molecular structures is often encountered in the field of organic semiconductors, but little is known about how it can impact electronic and charge transport properties in thin films. This study reveals the molecular orientati…
View article: Structure Properties Correlations on Nickel‐Iron Oxide Catalysts Deposited by Atomic Layer Deposition for the Oxygen Evolution Reaction in Alkaline Media
Structure Properties Correlations on Nickel‐Iron Oxide Catalysts Deposited by Atomic Layer Deposition for the Oxygen Evolution Reaction in Alkaline Media Open
Thermal atomic layer deposition (ALD) is used for the first time to deposit iron‐nickel oxides onto carbon nanotubes in a ternary process to produce a wide range of mixed oxide thin films. When using ferrocene (FeCp 2 ) and nickelocene (Ni…