Wolfram Jaegermann
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View article: Composition and Resulting Band Alignment at the TiO<sub>2</sub>/InP Heterointerface: A Fundamental Study Combining Photoemission Spectroscopy and Theory
Composition and Resulting Band Alignment at the TiO<sub>2</sub>/InP Heterointerface: A Fundamental Study Combining Photoemission Spectroscopy and Theory Open
The composition and resulting band alignment at the TiO 2 /InP heterointerface are critical for optimizing semiconductor‐based photoelectrochemical and photovoltaic devices. Hence, a systematic investigation of the chemical composition and…
View article: Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction
Exploring Electronic States and Ultrafast Electron Dynamics in AlInP Window Layers: The Role of Surface Reconstruction Open
AlInP (001) is widely utilized as a window layer in optoelectronic devices, including world‐record III‐V multi‐junction solar cells and photoelectrochemical (PEC) cells. The chemical and electronic properties of AlInP (001) depend on its s…
View article: Photoemission Study of GaN Passivation Layers and Band Alignment at GaInP(100) Heterointerfaces
Photoemission Study of GaN Passivation Layers and Band Alignment at GaInP(100) Heterointerfaces Open
To date, III-V semiconductor-based tandem devices with GaInP top photoabsorbers show the highest solar-to-electricity or solar-to-fuel conversion efficiencies. In photoelectrochemical (PEC) cells, however, III-V semiconductors are sensitiv…
View article: Applying Nuclear Forward Scattering as <i>In Situ</i> and <i>Operando</i> Tool for the Characterization of FeN<sub>4</sub> Moieties in the Hydrogen Evolution Reaction
Applying Nuclear Forward Scattering as <i>In Situ</i> and <i>Operando</i> Tool for the Characterization of FeN<sub>4</sub> Moieties in the Hydrogen Evolution Reaction Open
Nuclear forward scattering (NFS) is a synchrotron-based technique relying on the recoil-free nuclear resonance effect similar to Mössbauer spectroscopy. In this work, we introduce NFS for in situ and operando measurements during electrocat…
View article: Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective
Integration of Multijunction Absorbers and Catalysts for Efficient Solar‐Driven Artificial Leaf Structures: A Physical and Materials Science Perspective Open
Artificial leaves could be the breakthrough technology to overcome the limitations of storage and mobility through the synthesis of chemical fuels from sunlight, which will be an essential component of a sustainable future energy system. H…
View article: Voltage-dependent charge compensation mechanism and cathode electrolyte interface stability of the lithium-ion battery cathode materials LiCoO<sub>2</sub> and LiNi<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>O<sub>2</sub> studied by photoelectron spectroscopy
Voltage-dependent charge compensation mechanism and cathode electrolyte interface stability of the lithium-ion battery cathode materials LiCoO<sub>2</sub> and LiNi<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>O<sub>2</sub> studied by photoelectron spectroscopy Open
Charge state dependent core level spectroscopy after in vacuo scratching reveals the electronic structure reasons for the high voltage limits of the relevant Li-ion battery cathode materials LiCoO 2 (LCO) and LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NM…
View article: Photoelectron Spectroscopy of Co-evaporated and Spin-Coated LiTFSI-Doped Spiro-OMeTAD Reveals the Interface Energetics Inside a MAPI-based Perovskite Solar Cell
Photoelectron Spectroscopy of Co-evaporated and Spin-Coated LiTFSI-Doped Spiro-OMeTAD Reveals the Interface Energetics Inside a MAPI-based Perovskite Solar Cell Open
The electronic doping mechanism of the Spiro-OMeTAD (2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene) with LiTFSI (lithium bis(trifluoromethylsulfonyl)imide) and tBP (4-tert-Butylpyridine) has not been fully understoo…
View article: Applying Nuclear Forward Scattering as in situ and operando Tool for the Characterization of FeN4 moieties in the hydrogen evolution reaction
Applying Nuclear Forward Scattering as in situ and operando Tool for the Characterization of FeN4 moieties in the hydrogen evolution reaction Open
Nuclear forward scattering (NFS) is a synchrotron-based technique relying on the recoil-free nuclear resonance effect similar to Mössbauer spectroscopy. In this work, we introduce NFS for in situ and operando measurements during electrocat…
View article: Effect of Metal Layer Support Structures on the Catalytic Activity of NiFe(oxy)hydroxide (LDH) for the OER in Alkaline Media
Effect of Metal Layer Support Structures on the Catalytic Activity of NiFe(oxy)hydroxide (LDH) for the OER in Alkaline Media Open
Photoelectrochemical (PEC) cells promise to combine the benefits of photovoltaics and electrolysis in one device. They consist of a photoabsorber functionalized with an electrocatalyst to harvest faradaic currents under reduced overpotenti…
View article: Dangling Bond Defects on Si Surfaces and Their Consequences on Energy Band Diagrams: From a Photoelectrochemical Perspective
Dangling Bond Defects on Si Surfaces and Their Consequences on Energy Band Diagrams: From a Photoelectrochemical Perspective Open
Using silicon in multijunction photocells leads to promising device structures for direct photoelectrochemical water splitting. In this regard, photoelectron spectra of silicon surfaces are used to investigate the energetic condition of co…
View article: Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization
Improved Photoactivity Of NiO/ZnO Nanorods Heterostructured Films Relying On Scaffold Surface Cleaning And NiO Deposition Time Optimization Open
Herein, a surface cleaning procedure involving vacuum annealing under oxygen was applied for cleaning the zinc oxide nanorod (ZNR) scaffold film's surface before nickel oxide (NiO) deposition for heterostructure formation. The scaffold pro…
View article: Sol‐Gel‐Derived Ordered Mesoporous High Entropy Spinel Ferrites and Assessment of Their Photoelectrochemical and Electrocatalytic Water Splitting Performance
Sol‐Gel‐Derived Ordered Mesoporous High Entropy Spinel Ferrites and Assessment of Their Photoelectrochemical and Electrocatalytic Water Splitting Performance Open
The novel material class of high entropy oxides with their unique and unexpected physicochemical properties is a candidate for energy applications. Herein, it is reported for the first time about the physico‐ and (photo‐) electrochemical p…
View article: An artificial leaf device built with earth-abundant materials for combined H<sub>2</sub> production and storage as formate with efficiency > 10%
An artificial leaf device built with earth-abundant materials for combined H<sub>2</sub> production and storage as formate with efficiency > 10% Open
A major challenge for achieving the energy transition and transforming the current energy model into distributed production is the development of efficient artificial leaf devices made of earth-abundant materials for sustainable fuel produ…
View article: Correction: Impact of thermal gas treatment on the surface modification of Li-rich Mn-based cathode materials for Li-ion batteries
Correction: Impact of thermal gas treatment on the surface modification of Li-rich Mn-based cathode materials for Li-ion batteries Open
Correction for ‘Impact of thermal gas treatment on the surface modification of Li-rich Mn-based cathode materials for Li-ion batteries’ by Maximilian Mellin et al. , Mater. Adv. , 2023, 4 , 3746–3758, https://doi.org/10.1039/D3MA00236E.
View article: Impact of thermal gas treatment on the surface modification of Li-rich Mn-based cathode materials for Li-ion batteries
Impact of thermal gas treatment on the surface modification of Li-rich Mn-based cathode materials for Li-ion batteries Open
Thermal double gases SO 2 and NH 3 treatment of 0.33Li 2 MnO 3 · 0.67LiNi 0.4 Co 0.2 Mn 0.4 O 2 cathode materials leads to a partial reduction of the Co 3+ and Mn 4+ ions via electron transfer from SO 2 to the transition metal sites and su…
View article: Tapered Cross Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III‐V Semiconductor Devices
Tapered Cross Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III‐V Semiconductor Devices Open
Interfaces are key elements that define electronic properties of the final device. Inevitably, most of the active interfaces of III–V semiconductor devices are buried and it is therefore not straightforward to characterize them. The Tapere…
View article: Substituent Effects in Iron Porphyrin Catalysts for the Hydrogen Evolution Reaction**
Substituent Effects in Iron Porphyrin Catalysts for the Hydrogen Evolution Reaction** Open
For a future hydrogen economy, non‐precious metal catalysts for the water splitting reactions are needed that can be implemented on a global scale. Metal‐nitrogen‐carbon (MNC) catalysts with active sites constituting a metal center with fo…
View article: On the Surface Modification of LLZTO with LiF via a Gas-Phase Approach and the Characterization of the Interfaces of LiF with LLZTO as Well as PEO+LiTFSI
On the Surface Modification of LLZTO with LiF via a Gas-Phase Approach and the Characterization of the Interfaces of LiF with LLZTO as Well as PEO+LiTFSI Open
In this study we present gas-phase fluorination as a method to create a thin LiF layer on Li6.5La3Zr1.5Ta0.5O12 (LLZTO). We compared these fluorinated films with LiF films produced by RF-magnetron sputtering, where we investigated the inte…
View article: Sol-gel-derived Ordered Mesoporous High Entropy Spinel Ferrites and Assessment of their Photoelectrochemical and Electrocatalytic Water Splitting Performance
Sol-gel-derived Ordered Mesoporous High Entropy Spinel Ferrites and Assessment of their Photoelectrochemical and Electrocatalytic Water Splitting Performance Open
For driving the (photo-) electrocatalytic water splitting reaction both efficient and photostable absorber materials and electrocatalysts are needed in order to make the technology economically competitive. The novel material class of high…
View article: Clean and Hydrogen‐Adsorbed AlInP(001) Surfaces: Structures and Electronic Properties
Clean and Hydrogen‐Adsorbed AlInP(001) Surfaces: Structures and Electronic Properties Open
Total energy and electronic structure calculations based on density functional theory are performed in order to determine the atomic structure and electronic properties of clean and hydrogen‐adsorbed Al 0.5 In 0.5 P(001) surfaces. It is fo…
View article: On the Surface Modification of LLZTO with LiF via a Gas-Phase Approach and the Characterization of the Interfaces of LiF with LLZTO as well as PEO+LiTFSI
On the Surface Modification of LLZTO with LiF via a Gas-Phase Approach and the Characterization of the Interfaces of LiF with LLZTO as well as PEO+LiTFSI Open
In this study we present gas-phase fluorination as a method to create a thin LiF layer on Li6.5La3Zr1.5Ta0.5O12 (LLZTO). We compare these fluorinated films with LiF films produced by RF-magnetron sputtering, where we investigated the inter…
View article: Tapered Cross-Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III-V Semiconductor Devices
Tapered Cross-Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III-V Semiconductor Devices Open
Interfaces are key elements that define electronic properties of the final device. Inevitably, most of the active interfaces of III-V semiconductor devices are buried and it is therefore not straightforward to characterize them. The Tapere…
View article: Tapered Cross-Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III-V Semiconductor Devices
Tapered Cross-Section Photoelectron Spectroscopy Provides Insights into the Buried Interfaces of III-V Semiconductor Devices Open
Interfaces are key elements that define electronic properties of the final device. Inevitably, the active interfaces of III-V semiconductor devices are buried and it is therefore not straightforward to characterize them. The Tapered Cross-…
View article: Band energy diagrams of n-GaInP/n-AlInP(100) surfaces and heterointerfaces studied by X-ray photoelectron spectroscopy
Band energy diagrams of n-GaInP/n-AlInP(100) surfaces and heterointerfaces studied by X-ray photoelectron spectroscopy Open
Lattice matched n-type AlInP(100) charge selective contacts are commonly grown on n-p GaInP(100) top absorbers in high-efficiency III-V multijunction solar or photoelectrochemical cells. The cell performance can be greatly limited by the e…
View article: P-terminated InP(001) surfaces: Surface band bending and reactivity to water
P-terminated InP(001) surfaces: Surface band bending and reactivity to water Open
Stable InP(001) surfaces are characterized by fully occupied and empty surface states close to the bulk valence and conduction band edges, respectively. The present photoemission data show, however, a surface Fermi level pinning only sligh…
View article: AlInP(001) surface structure and electronic properties
AlInP(001) surface structure and electronic properties Open
Total-energy and electronic structure calculations based on density-functional theory are performed in order to determine the atomic structure and electronic properties of Al0.5In0.5P(001) surfaces. It is found that most of the stable surf…
View article: Substituent effects in iron porphyrin catalysts for the hydrogen evolution reaction
Substituent effects in iron porphyrin catalysts for the hydrogen evolution reaction Open
For a future hydrogen economy, non precious metal catalysts for the water splitting reactions are needed that can be implemented on a global scale. MNC catalysts with MN4 active sites show promising performance, but an optimization rooted …
View article: AlInP(001) surface structure and electronic properties
AlInP(001) surface structure and electronic properties Open
Total-energy and electronic structure calculations based on density-functional theory are performed in order to determine the atomic structure and electronic properties of Al0.5In0.5P(001) surfaces. It is found that most of the stable surf…