A5041413801- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Molecular Junctions and Nanostructures
- Thin-Film Transistor Technologies
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic Light-Emitting Diodes Research
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Covalent Organic Framework Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Semiconductor materials and devices
- 2D Materials and Applications
- Force Microscopy Techniques and Applications
- Luminescence and Fluorescent Materials
- Graphene research and applications
- Crystallography and molecular interactions
- Analytical Chemistry and Sensors
- Organic and Molecular Conductors Research
- Surface Chemistry and Catalysis
- Gas Sensing Nanomaterials and Sensors
- Nanowire Synthesis and Applications
- ZnO doping and properties
- Semiconductor materials and interfaces
Technische Universität Dresden
2016-2025
Center for Advancing Health
2014-2025
Chinese Academy of Sciences
2010-2022
Ningbo Institute of Industrial Technology
2022
Fraunhofer Institute for Ceramic Technologies and Systems
2022
Ningbo University
2022
Faculty (United Kingdom)
2019
SLAC National Accelerator Laboratory
2008-2016
Stanford Synchrotron Radiation Lightsource
2008-2016
Stanford University
2006-2015
Solution-based deposition techniques and strategies to control the morphology of organic semiconductor thin films are reviewed discussed.
Crystalline self-assembled monolayers (SAMs) of organosilane compounds such as octadecyltrimethoxysilane (OTMS) and octadecyltrichlorosilane (OTCS) were deposited by a simple, spin-casting technique onto Si/SiO(2) substrates. Fabrication the OTMS SAMs characterization using ellipsometry, contact angle, atomic force microscopy (AFM), grazing angle attenuated total reflectance Fourier transform infrared (GATR-FTIR) spectroscopy incidence X-ray diffraction (GIXD) are described. The confirms...
Perylenetetracarboxyldiimide (PTCDI) nanowires self-assembled from commercially available materials are demonstrated as the n-channel semiconductor in organic field-effect transistors (OFETs) and a building block high-performance complementary inverters. Devices based on network of PTCDI have electron mobilities current on/off ratios order 10-2 cm2/Vs 104, respectively. Complementary inverters nanowire p-channel hexathiapentacene (HTP) OFETs achieved gains high 8. These results demonstrate...
Substituted side chains are fundamental units in solution processable organic semiconductors order to achieve a balance of close intermolecular stacking, high crystallinity, and good compatibility with different wet techniques. Based on four air-stable solution-processed naphthalene diimides fused 2-(1,3-dithiol-2-ylidene)malononitrile groups (NDI-DTYM2) that bear branched alkyl varied side-chain length branching position, we have carried out systematic studies the relationship between film...
Organic nanowires self-assembled from small-molecule semiconductors and conducting polymers have attracted an enormous amount of interest for use in organic field-effect transistors. This new class materials offers solution processability, the potential elucidating transport mechanisms structure-property relationships, realization high-performance transistors that rival performance amorphous Si. We discuss self-assembly one-dimensional, single-crystalline nanowires, show structures commonly...
Abstract The search for low‐cost, large‐area, flexible devices has led to a remarkable increase in the research and development of organic semiconductors, which serve as one most important components field‐effect transistors (OFETs). In current review, we highlight deposition techniques that offer precise control over location or in‐plane orientation semiconductors. We focus on various vapor‐ solution‐processing patterning single crystals desired locations. Furthermore, alignment...
For organic semiconductors to find ubiquitous electronics applications, the development of new materials with high mobility and air stability is critical. Despite versatility carbon, exploratory chemical synthesis in vast space can be hindered by synthetic characterization difficulties. Here we show that silico screening novel derivatives dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene semiconductor hole lead discovery a high-performance semiconductor. On basis estimates from Marcus theory...
The development of low-cost, reliable sensors will rely on devices capable converting an analyte binding event to easily read electrical signal. Organic thin-film transistors (OTFTs) are ideal for inexpensive, single-use chemical or biological because their compatibility with flexible, large-area substrates, simple processing, and highly tunable active layer materials. We have fabricated low-operating voltage OTFTs a cross-linked polymer gate dielectric, which display stable operation under...
An average PCE of 4.2% for all-polymer solar cells from 20 devices with an J SC 8.8 mA cm−2 are obtained a donor-acceptor pair despite low LUMO-LUMO energy offset less than 0.1 eV. Incorporation polystyrene side chains into the donor polymer is found to assist in reducing phase separation domain length scale, and results more 20% enhancement PCE. We observe direct correlation between short circuit current (J SC) scale BHJ separation, which by resonance soft X-ray scattering. The performance...
As thin films become increasingly popular (for solar cells, LEDs, microelectronics, batteries), quantitative morphological and crystallographic information is needed to predict optimize the film’s electrical, optical, mechanical properties. This quantification can be obtained quickly easily with X-ray diffraction using an area detector in two sample geometries. In this paper, we describe a methodology for constructing complete pole figures fiber texture (isotropic in-plane orientation). We...
Significance Many applications, including solar cells and touch screens, require coatings that are both optically transparent electrically conductive. Most device structures use indium tin oxide to serve as this conductor (TC), even though it accounts for a disproportionally large amount of cost. Alternatives, such polymer-based materials, may not only provide additional cost benefits, but also allow added functionality, flexibility. In paper, we examine conductive...
Metal-organic frameworks (MOFs) have so far been highlighted for their potential roles in catalysis, gas storage and separation. However, the realization of high electrical conductivity (>10-3 S cm-1) magnetic ordering MOFs will afford them new functions spintronics, which remains relatively unexplored. Here, we demonstrate synthesis a two-dimensional MOF by solvothermal methods using perthiolated coronene as ligand planar iron-bis(dithiolene) linkages enabling full π-d conjugation. This 2D...
Abstract Morphology control of solution coated solar cell materials presents a key challenge limiting their device performance and commercial viability. Here we present new concept for controlling phase separation during printing using an all-polymer bulk heterojunction as model system. The aspect our method lies in the design fluid flow microstructured blade, on basis hypothesis flow-induced polymer crystallization. Our resulted ∼90% increase donor thin film crystallinity reduced microphase...
The challenge of continuous printing in high‐efficiency large‐area organic solar cells is a key limiting factor for their widespread adoption. A materials design concept achieving large‐area, solution‐coated all‐polymer bulk heterojunction with stable phase separation morphology between the donor and acceptor presented. lies inhibiting strong crystallization polymers, thus forming intermixed, low crystallinity, mostly amorphous blends. Based on experiments using donors acceptors different...
Oligothiophenes provide a highly controlled and adaptable platform to explore various synthetic, morphologic, electronic relationships in organic semiconductor systems. These short-chain systems serve as models for establishing valuable structure–property their polymer analogs. In contrast counterparts, oligothiophenes afford high-purity well-defined materials that can be easily modified with variety of functional groups. Recent work by number research groups has revealed functionalized the...
Understanding crystal polymorphism is a long-standing challenge relevant to many fields, such as pharmaceuticals, organic semiconductors, pigments, food, and explosives. Controlling of semiconductors (OSCs) in thin films particularly important given that form the active layer most electronics devices dramatic changes electronic properties can be induced even by small molecular packing. However, there are very few polymorphic OSCs for which structure-property relationships have been...