Stefan C. B. Mannsfeld
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View article: On‐Liquid Surface Synthesis of Crystalline 2D Polyimine Thin Films
On‐Liquid Surface Synthesis of Crystalline 2D Polyimine Thin Films Open
On‐water surface synthesis has emerged as a powerful approach for constructing thin‐layer, crystalline 2D polyimines and their layer‐stacked covalent organic frameworks. This is achieved by directing monomer preorganization and subsequent …
View article: Chiral two-dimensional conjugated metal-organic frameworks with high spin polarization
Chiral two-dimensional conjugated metal-organic frameworks with high spin polarization Open
View article: All‐Solution Processed OFETs from Non‐Chlorinated Solvents Based on New Isoindigo‐Based Conjugated Polymer
All‐Solution Processed OFETs from Non‐Chlorinated Solvents Based on New Isoindigo‐Based Conjugated Polymer Open
Here, an Isoindigo (IID) comprised with Naphthodithiophene (NDT)‐based low band‐gap donor–acceptor copolymer semiconductor is designed, synthesized, and investigated. The newly reported polymer provides good solubility in a range of haloge…
View article: On-liquid surface synthesis of diyne-linked two-dimensional polymer crystals
On-liquid surface synthesis of diyne-linked two-dimensional polymer crystals Open
The synthesis of thin crystalline two-dimensional polymers (2DPs) typically relies on reversible dynamic covalent reactions. While substantial progress has been made in solution-based and interfacial syntheses, achieving 2DPs through irrev…
View article: Morphology, Crystallinity, and Electrical Performance of Solution-Processed OFETs Based on a DPP-Based Small Molecule
Morphology, Crystallinity, and Electrical Performance of Solution-Processed OFETs Based on a DPP-Based Small Molecule Open
In this study, a diketopyrrolopyrrole (DPP)-based small molecule, 3,6-bis-(5'-(2-octyldodecyl)-[2,2'-bithiophen]-5-yl)-2,5-dipropyl-2,5-dihydropyrrolo-[3,4-c]-pyrrole-1,4-dione (DBT-I), was synthesized via Stille coupling. The thin-…
View article: High‐Performance Phototransistor Based on a 2D Polybenzimidazole Polymer
High‐Performance Phototransistor Based on a 2D Polybenzimidazole Polymer Open
Photodetectors are fundamental components of modern optoelectronics, enabling the conversion of light into electrical signals. The development of high‐performance phototransistors necessitates materials with both high charge carrier mobili…
View article: Redox-active electrolyte-based printed ionologic devices
Redox-active electrolyte-based printed ionologic devices Open
View article: Ammonia-Assisted Chemical Vapor Deposition Growth of Two-Dimensional Conjugated Coordination Polymer Thin Films
Ammonia-Assisted Chemical Vapor Deposition Growth of Two-Dimensional Conjugated Coordination Polymer Thin Films Open
As emerging electroactive materials, the controlled synthesis of highly ordered two-dimensional (2D) conjugated coordination polymer (c-CP) films ensuring the long-range π-electron delocalization is essential for advancing high-performance…
View article: Unveiling high-mobility hot carriers in a two-dimensional conjugated coordination polymer
Unveiling high-mobility hot carriers in a two-dimensional conjugated coordination polymer Open
Hot carriers, inheriting excess kinetic energy from high-energy photons, drive numerous optoelectronic applications reliant on non-equilibrium transport processes. Although extensively studied in inorganic materials, their potential in org…
View article: Solution‐Shearing of Highly Smooth Ion‐Gel Thin Films: Facilitating the Deposition of Organic Semiconductors for Ion‐Gated Organic Field Effect Transistors
Solution‐Shearing of Highly Smooth Ion‐Gel Thin Films: Facilitating the Deposition of Organic Semiconductors for Ion‐Gated Organic Field Effect Transistors Open
A straightforward method is developed to produce ion‐gels (IGs) with surface roughness at the nanometer level using a solution‐shearing process, enabling the first successful growth of crystalline, small‐molecule organic semiconductor (OSC…
View article: Interface-Tailored Secondary Excitation and Ultrafast Charge/Energy Transfer in Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>-MoS<sub>2</sub> Heterostructure Films
Interface-Tailored Secondary Excitation and Ultrafast Charge/Energy Transfer in Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>-MoS<sub>2</sub> Heterostructure Films Open
Charge/energy separation across interfaces of plasmonic materials is vital for minimizing plasmonic losses and enhancing their performance in photochemical and optoelectronic applications. While heterostructures combining plasmonic two-dim…
View article: Solution‐Processed Bismuth Oxide Iodide/Organic‐Semiconductor Heterojunction for UV–vis‐NIR Photoresponsive Electronics
Solution‐Processed Bismuth Oxide Iodide/Organic‐Semiconductor Heterojunction for UV–vis‐NIR Photoresponsive Electronics Open
The emerging light absorber material bismuth oxide iodide BiOI, possesses convenient solution processibility and excellent chemical stability under ambient conditions along with a high light absorption coefficient reaching 5·10 4 cm −1 . C…
View article: Solution Shearing of Sustainable Aluminum Oxide Thin Films for Compliance‐Free, Voltage‐Regulated Multi‐Bit Memristors
Solution Shearing of Sustainable Aluminum Oxide Thin Films for Compliance‐Free, Voltage‐Regulated Multi‐Bit Memristors Open
In this work, solution shearing approach is used to fabricate sustainable, de‐ionized water based 15 nm aluminum oxide (AlO x ) thin films employing a combination of low‐temperature thermal annealing and deep UV exposure techniques. Their …
View article: Beyond the band edge: Unveiling high-mobility hot carriers in a two-dimensional conjugated coordination polymer
Beyond the band edge: Unveiling high-mobility hot carriers in a two-dimensional conjugated coordination polymer Open
Hot carriers, inheriting excess kinetic energy from high-energy photons, underpin numerous optoelectronic applications involving non-equilibrium transport processes. Current research on hot carriers has predominantly focused on inorganic m…
View article: Understanding structure–property relationships in coordination polymers: a comparative study of the copper(<scp>ii</scp>) and zinc(<scp>ii</scp>) coordination mechanism
Understanding structure–property relationships in coordination polymers: a comparative study of the copper(<span>ii</span>) and zinc(<span>ii</span>) coordination mechanism Open
In metal–organic coordination polymers, metal ions can adopt square-planar or tetrahedral geometries, affecting electronic properties. These configurations are studied via AFM, XPS, and DFT modelling to compare structural and electronic di…
View article: Sensitive Self‐Driven Single‐Component Organic Photodetector Based on Vapor‐Deposited Small Molecules
Sensitive Self‐Driven Single‐Component Organic Photodetector Based on Vapor‐Deposited Small Molecules Open
Typically, organic solar cells (OSCs) and photodetectors (OPDs) comprise an electron donating and accepting material to facilitate efficient charge carrier generation. This approach has proven successful in achieving high‐performance devic…
View article: Publisher Correction: Elastic films of single-crystal two-dimensional covalent organic frameworks
Publisher Correction: Elastic films of single-crystal two-dimensional covalent organic frameworks Open
View article: Organic Multibit Phototransistor Memories with High External Quantum Efficiency
Organic Multibit Phototransistor Memories with High External Quantum Efficiency Open
This work reports phototransistor memory devices fabricated using organic planar heterojunctions of two organic semiconductor materials, namely poly(2,5‐bis(2‐octyldodecyl)−3,6‐di(pyridin‐2‐yl)‐pyrrolo[3,4‐c]pyrrole‐1,4(2H,5H)‐dione‐alt‐2,…
View article: Eco‐Friendly Approach to Ultra‐Thin Metal Oxides‐ Solution Sheared Aluminum Oxide for Half‐Volt Operation of Organic Field‐Effect Transistors
Eco‐Friendly Approach to Ultra‐Thin Metal Oxides‐ Solution Sheared Aluminum Oxide for Half‐Volt Operation of Organic Field‐Effect Transistors Open
Sol–gel‐based solution‐processed metal oxides have emerged as a key fabrication method for applications in thin film transistors both as a semiconducting and a dielectric layer. Here, a low‐temperature, green solvent‐based, non‐toxic, and …
View article: Band Structure Engineering in Highly Crystalline Organic Semiconductors
Band Structure Engineering in Highly Crystalline Organic Semiconductors Open
Blending of semiconductors for controlling the energy levels (band structure engineering) is an important technique, in particular, for optoelectronic applications. The underlying physics is the delocalized Bloch states, which average over…
View article: Influence of chemical interactions on the electronic properties of BiOI/organic semiconductor heterojunctions for application in solution-processed electronics
Influence of chemical interactions on the electronic properties of BiOI/organic semiconductor heterojunctions for application in solution-processed electronics Open
Bismuth oxide iodide (BiOI) has been viewed as a suitable environmentally-friendly alternative to lead-halide perovskites for low-cost (opto-)electronic applications such as photodetectors, phototransistors and sensors. To enable its incor…
View article: On-liquid-gallium surface synthesis of ultra-smooth conductive metal-organic framework thin films
On-liquid-gallium surface synthesis of ultra-smooth conductive metal-organic framework thin films Open
Conductive metal-organic frameworks (MOFs) are emerging electroactive materials for (opto-)electronics. However, it remains a great challenge to achieve reliable MOF-based devices via the existing synthesis methods that are compatible with…
View article: Analysis of the Annealing Budget of Metal Oxide Thin-Film Transistors Prepared by an Aqueous Blade-Coating Process
Analysis of the Annealing Budget of Metal Oxide Thin-Film Transistors Prepared by an Aqueous Blade-Coating Process Open
Metal oxide (MO) semiconductors are widely used in electronic devices due to their high optical transmittance and promising electrical performance. This work describes the advancement toward an eco-friendly, streamlined method for preparin…
View article: Tailoring the Morphology of a Diketopyrrolopyrrole‐based Polymer as Films or Wires for High‐Performance OFETs using Solution Shearing (Small Methods 3/2024)
Tailoring the Morphology of a Diketopyrrolopyrrole‐based Polymer as Films or Wires for High‐Performance OFETs using Solution Shearing (Small Methods 3/2024) Open
View article: On‐Water Surface Synthesis of Vinylene‐Linked Cationic Two‐Dimensional Polymer Films as the Anion‐Selective Electrode Coating
On‐Water Surface Synthesis of Vinylene‐Linked Cationic Two‐Dimensional Polymer Films as the Anion‐Selective Electrode Coating Open
Vinylene‐linked two‐dimensional polymers (V‐2DPs) and their layer‐stacked covalent organic frameworks (V‐2D COFs) featuring high in‐plane π‐conjugation and robust frameworks have emerged as promising candidates for energy‐related applicati…
View article: Synthese an der Wasseroberfläche von Vinylen‐Verbundenen Kationischen Zwei‐Dimensionalen Polymerfilmen als Beschichtung für Anion‐Selektive Elektroden
Synthese an der Wasseroberfläche von Vinylen‐Verbundenen Kationischen Zwei‐Dimensionalen Polymerfilmen als Beschichtung für Anion‐Selektive Elektroden Open
Vinylen verbrückte zwei‐dimensionale Polymere (V‐2DPs) und deren schichtgestapelten kovalent organische Gerüstverbindungen (V‐2D COFs) zeichnen sich durch ihre hohe π‐Konjugation in der Ebene und ihre robuste Struktur als vielversprechnend…
View article: Impact of Thermal Annealing on the Dissolution of Semiconducting Polymer Thin Films
Impact of Thermal Annealing on the Dissolution of Semiconducting Polymer Thin Films Open
Here, the effect of thermal annealing (TA) on the stability of solution‐sheared thin films of the semiconducting polymer poly[2,5‐bis(2‐octyldodecyl)pyrrolo[3,4‐c]pyrrole‐1,4(2H,5H)‐dione‐3,6‐diyl)‐alt‐(2,2′;5′,2′’;5′’,2′’’‐quaterthiophen‐…
View article: A Cu<sub>3</sub>BHT‐Graphene van der Waals Heterostructure with Strong Interlayer Coupling for Highly Efficient Photoinduced Charge Separation
A Cu<sub>3</sub>BHT‐Graphene van der Waals Heterostructure with Strong Interlayer Coupling for Highly Efficient Photoinduced Charge Separation Open
Two‐dimensional van der Waals heterostructures (2D vdWhs) are of significant interest due to their intriguing physical properties critically defined by the constituent monolayers and their interlayer coupling. Synthetic access to 2D vdWhs …
View article: Giant Blue Energy Harvesting in Two‐Dimensional Polymer Membranes with Spatially Aligned Charges
Giant Blue Energy Harvesting in Two‐Dimensional Polymer Membranes with Spatially Aligned Charges Open
Blue energy between seawater and river water is attracting increasing interest, as one of the sustainable and renewable energy resources that can be harvested from water. Within the reverse electrodialysis applied in blue energy conversion…
View article: Structural Reinforcement in Mechanically Interlocked Two-Dimensional Polymers by Suppressing Interlayer Sliding
Structural Reinforcement in Mechanically Interlocked Two-Dimensional Polymers by Suppressing Interlayer Sliding Open
Preserving the superior mechanical properties of monolayer two-dimensional (2D) materials when transitioning to bilayer and layer-stacked structures poses a great challenge, primarily arising from the weak van der Waals (vdW) forces that f…