Erdmann Spiecker
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View article: A simultaneous synergistic protection mechanism in hybrid perovskite–organic multi-junctions enables long-term stable and efficient tandem solar cells
A simultaneous synergistic protection mechanism in hybrid perovskite–organic multi-junctions enables long-term stable and efficient tandem solar cells Open
Monolithic perovskite–organic tandem solar cells (P–O TSCs) establish a mutual protection system, which enables high-efficiency P–O TSCs (25.12%) to achieve exceptional operational stability, retaining over 91% after 1000-hour illumination.
View article: A Simultaneous Synergistic Protection Mechanism in Hybrid Perovskite-Organic Multi-junctions Enables Long-Term Stable and Efficient Tandem Solar Cells
A Simultaneous Synergistic Protection Mechanism in Hybrid Perovskite-Organic Multi-junctions Enables Long-Term Stable and Efficient Tandem Solar Cells Open
Perovskite-organic tandem solar cells (P-O TSCs) hold great promise for next-generation thin-film photovoltaics, with steadily improving power conversion efficiency (PCE). However, the development of optimal interconnecting layers (ICLs) r…
View article: Fluoride‐Induced Corrosion of Stainless Steel: A Case Study for its Application as Proton Exchange Membrane Water Electrolysis Bipolar Plate Material
Fluoride‐Induced Corrosion of Stainless Steel: A Case Study for its Application as Proton Exchange Membrane Water Electrolysis Bipolar Plate Material Open
Stainless steel is a promising material for bipolar plates (BPP) in proton exchange membrane water electrolysis (PEMWE) that could drastically reduce stack costs. However, dissolution of Fe from stainless steel BPP might trigger membrane d…
View article: Deformation and Failure of Supported Five-Fold Twinned Silver Nanowires under Tensile, Compressive, and Cyclic Loading
Deformation and Failure of Supported Five-Fold Twinned Silver Nanowires under Tensile, Compressive, and Cyclic Loading Open
Silver nanowire (AgNW) networks have emerged as one of the most promising materials for flexible transparent conductive electrodes. These wires offer excellent electrical, optical, and mechanical properties and can be applied using low-cos…
View article: Fine-Tuning Donor Material Deposition with Ultrasonic Aerosol Jet Printing to Balance Efficiency and Stability in Inverted Organic Photovoltaic Devices
Fine-Tuning Donor Material Deposition with Ultrasonic Aerosol Jet Printing to Balance Efficiency and Stability in Inverted Organic Photovoltaic Devices Open
The response surface methodology (RSM) based on a Box-Behnken (BB) design of experiment (DoE) approach was performed, with the central point repeated four times to enhance statistical reliability, to systematically investigate the influenc…
View article: Synthesis and Self‐Assembly of a Discotic Oligo‐Carboxylate <i>Tetra‐</i>Porphyrin‐Perylenebisimide Amphiphile
Synthesis and Self‐Assembly of a Discotic Oligo‐Carboxylate <i>Tetra‐</i>Porphyrin‐Perylenebisimide Amphiphile Open
We report the synthesis of an amphiphilic tetra ‐porphyrin perylenebisimide (PBI) conjugate via four‐fold Suzuki cross‐coupling at the PBI ortho‐ position. Oligo‐carboxylate Newkome‐type G1 dendrons attached at the porphyrin periphery serv…
View article: Reductive Treatment of Ga–Pt-Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation
Reductive Treatment of Ga–Pt-Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Propane Dehydrogenation Open
A comprehensive investigation of the impact of hydrogen (H2) pretreatments on Ga-Pt supported catalytic active liquid metal solution (SCALMS) for propane dehydrogenation (PDH) is reported. Our approach bridges from model system investigati…
View article: Identification of polytypism and their dislocations in bilayer MoS2 using correlative transmission electron microscopy and Raman spectroscopy
Identification of polytypism and their dislocations in bilayer MoS2 using correlative transmission electron microscopy and Raman spectroscopy Open
Stacking orders and topological defects substantially influence the physical properties of 2D van der Waals (vdW) materials. However, the inherent features of 2D materials challenge the effectiveness of single characterization techniques i…
View article: A new angle on stacking faults: Breaking the edge-on limit in high-resolution defect analysis
A new angle on stacking faults: Breaking the edge-on limit in high-resolution defect analysis Open
This record contains datasets and code related to the publication: N. Karpstein et al., A new angle on stacking faults: Breaking the edge-on limit in high-resolution defect analysis (submitted to journal). A preprint has been uploaded to a…
View article: Cation Vacancies in Ti‐Deficient TiO<sub>2</sub> Nanosheets Enable Highly Stable Trapping of Pt Single Atoms for Persistent Photocatalytic Hydrogen Evolution
Cation Vacancies in Ti‐Deficient TiO<sub>2</sub> Nanosheets Enable Highly Stable Trapping of Pt Single Atoms for Persistent Photocatalytic Hydrogen Evolution Open
The stabilization of single‐atom catalysts on semiconductor substrates is pivotal for advancing photocatalysis. TiO 2 , a widely employed photocatalyst, typically stabilizes single atoms at oxygen vacancies—sites that are accessible but pr…
View article: Synthesis and Aggregation of Amphiphilic Porphyrin‐Perylenebisimide Dyads
Synthesis and Aggregation of Amphiphilic Porphyrin‐Perylenebisimide Dyads Open
We report the straightforward synthesis of a family of amphiphilic zinc‐porphyrin‐perylenebisimide (PBI) dyads containing sterically demanding substituents at the porphyrin meso‐ position, as well as at the PBI bay‐position. The hydrophili…
View article: Human bone ultrastructure in 3D: Multimodal correlative study combining nanoscale X-ray computed tomography and quantitative polarized Raman spectroscopy
Human bone ultrastructure in 3D: Multimodal correlative study combining nanoscale X-ray computed tomography and quantitative polarized Raman spectroscopy Open
Unique mechanical properties of cortical bone are defined by the arrangement and ratio of its organic and inorganic constituents. This arrangement can be influenced by ageing and disease, urging the understanding of normal and deviant morp…
View article: Insights into Stability and Selective Agglomeration in Binary Mixtures of Colloids: A Study on Gold Nanoparticles and Ultra-Small Quantum Dots
Insights into Stability and Selective Agglomeration in Binary Mixtures of Colloids: A Study on Gold Nanoparticles and Ultra-Small Quantum Dots Open
Controlling the stability of colloidal nanoparticles in multicomponent systems is crucial for advancing formulations and separation processes. This study investigates the selective agglomeration approach for binary colloidal mixtures, prov…
View article: p‐Type TiO<sub>2</sub> Nanotubes: Quantum Confinement and Pt Single Atom Decoration Enable High Selectivity Photocatalytic Nitrate Reduction to Ammonia
p‐Type TiO<sub>2</sub> Nanotubes: Quantum Confinement and Pt Single Atom Decoration Enable High Selectivity Photocatalytic Nitrate Reduction to Ammonia Open
We synthesize p‐type TiO 2 nanotubes that allow band‐gap adjustment by quantum confinement. These tubes therefore enable reductive photocatalytic reactions that are not thermodynamically possible on classic titania photocatalysts. Here, we…
View article: p‐Type TiO<sub>2</sub> Nanotubes: Quantum Confinement and Pt Single Atom Decoration Enable High Selectivity Photocatalytic Nitrate Reduction to Ammonia
p‐Type TiO<sub>2</sub> Nanotubes: Quantum Confinement and Pt Single Atom Decoration Enable High Selectivity Photocatalytic Nitrate Reduction to Ammonia Open
We synthesize p‐type TiO 2 nanotubes that allow band‐gap adjustment by quantum confinement. These tubes therefore enable reductive photocatalytic reactions that are not thermodynamically possible on classic titania photocatalysts. Here, we…
View article: Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization
Single Atom Sites in Ga‐Ni Supported Catalytically Active Liquid Metal Solutions (SCALMS) for Selective Ethylene Oligomerization Open
Supported catalytically active liquid metal solutions (SCALMS) are materials composed of a liquid metal alloy deposited on a porous support. Due to the dynamic properties of the liquid metal alloy, these systems are suggested to form singl…
View article: Role of Polycrystalline F-SnO2 Substrate Topography on Formation Mechanism and Morphology of Pt Nanoparticles by Solid-State-Dewetting
Role of Polycrystalline F-SnO2 Substrate Topography on Formation Mechanism and Morphology of Pt Nanoparticles by Solid-State-Dewetting Open
Solid-state-Dewetting (SSD) of thin films is increasingly utilized to fabricate nanoparticles for catalysis. In-depth understanding of particle formation mechanism is crucial to control key properties of catalytic particles such as size, s…
View article: Role of Polycrystalline F-SnO2 Substrate Topography on Formation Mechanism and Morphology of Pt Nanoparticles by Solid-State-Dewetting
Role of Polycrystalline F-SnO2 Substrate Topography on Formation Mechanism and Morphology of Pt Nanoparticles by Solid-State-Dewetting Open
Solid-state-Dewetting (SSD) of thin films is increasingly utilized to fabricate nanoparticles for catalysis. In-depth understanding of particle formation mechanism is crucial to control key properties of catalytic particles such as size, s…
View article: Dataset of the manuscript: Correlative X-ray and electron tomography for scale-bridging, quantitative analysis of complex, hierarchical particle systems
Dataset of the manuscript: Correlative X-ray and electron tomography for scale-bridging, quantitative analysis of complex, hierarchical particle systems Open
This data publication is based on the metadata and datasets underlying the manuscript "Correlative X-ray and electron tomography for scale-bridging, quantitative analysis of complex, hierarchical particle systems" (https://doi.org/10.1016/…
View article: Improving electron tomography of mesoporous silica by Ga intrusion
Improving electron tomography of mesoporous silica by Ga intrusion Open
Electron tomography (ET) offers nanoscale 3D characterization of mesoporous materials but is often limited by their low scattering contrast. Here, we introduce a gallium (Ga) intrusion strategy for mesoporous silica that dramatically impro…
View article: Identification of Polytypism and Their Dislocations in Bilayer MoS2 Using Correlative Transmission Electron Microscopy and Raman Spectroscopy
Identification of Polytypism and Their Dislocations in Bilayer MoS2 Using Correlative Transmission Electron Microscopy and Raman Spectroscopy Open
Stacking orders and topological defects substantially influence the physical properties of 2D van der Waals (vdW) materials. However, the inherent features of 2D materials challenge the effectiveness of single characterization techniques i…