A5008497017- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Chemical Synthesis and Characterization
- Metal-Organic Frameworks: Synthesis and Applications
- Radioactive element chemistry and processing
- Acoustic Wave Resonator Technologies
- Extraction and Separation Processes
- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Thin-Film Transistor Technologies
- Mechanical and Optical Resonators
- Additive Manufacturing and 3D Printing Technologies
- Organic Light-Emitting Diodes Research
- Magnetism in coordination complexes
- Advanced Chemical Sensor Technologies
- Copper Interconnects and Reliability
- Electrochemical sensors and biosensors
- Quantum Dots Synthesis And Properties
- Analytical chemistry methods development
- Molecular Junctions and Nanostructures
- MXene and MAX Phase Materials
- Corrosion Behavior and Inhibition
- Nanowire Synthesis and Applications
- Ga2O3 and related materials
Institute of Process Engineering
2023-2025
KU Leuven
2020-2023
National Center for Nanoscience and Technology
2014-2018
Center for Excellence in Education
2016-2017
Center for NanoScience
2016-2017
Solution-processable small molecules for organic solar cells have attracted intense attention their advantages of definite molecular structures compared with polymer counterparts. However, the device efficiencies based on are still lower than those polymers, especially inverted devices, highest efficiency which is <9%. Here we report three novel solution-processable molecules, contain π-bridges gradient-decreased electron density and end acceptors substituted various fluorine atoms (0F, 1F...
A ternary blend system with two donors and one acceptor provides an effective route to improve the performance of organic solar cells. synergistic effect polymer small molecules is observed in cells, power conversion efficiency (PCE) (8.40%) higher than those binary systems based on (7.48%) or polymers (6.85%).
Large‐scale fabrication of organic solar cells requires an active layer with high thickness tolerability and the use environment‐friendly solvents. Thick films high‐performance can be achieved via a ternary strategy studied herein. The system consists one polymer donor, small molecule fullerene acceptor. enhances crystallinity face‐on orientation layer, leading to improved compared that polymer‐fullerene binary system. An 270 nm exhibits average power conversion efficiency (PCE) 10.78%,...
Acceptor end-capping of oligomeric conjugated molecules is found to be an effective strategy for simultaneous spectral broadening, extinction coefficient enhancement, and energy level optimization, resulting in profoundly enhanced power conversion efficiencies (of 9.25% 8.91%) compared the original oligomers. This overcoming absorption disadvantage oligomers small due conjugation limitation.
Abstract Significant development has been achieved in nonfullerene organic solar cells. However, most of the high‐efficiency systems are composed polymer donors and fused‐ring acceptors, only a few small molecule can work well. Herein, new A–D–A donor named NDTSR with naphtho[1,2‐b:5,6‐b′]dithiophene (NDT) as building blocks is synthesized. Two energy levels well‐matched acceptors ITIC IDIC chosen to construct all‐small‐molecule cells NDTSR, respectively. When mixed IDIC, high power...
Two novel acceptor–donor–acceptor type small molecules based on a two-dimensional conjugated naphtho[1,2-b:5,6-b′]dithiophene (NDT) unit containing alkylthienyl or alkylphenyl side chains, named as NDTT-CNCOO and NDTP-CNCOO, respectively, were designed synthesized. Compared with NDTT-CNCOO, NDTP-CNCOO-based bulk heterojunction (BHJ) solar cells exhibited higher fill factors, short current density, power conversion efficiencies. Such performance benefitted from highly ordered structures,...
The TBP/FeCl3 solvent extraction (SX) system exhibits a high selectivity of lithium over magnesium from magnesium-rich brines, but it suffers the difficulty stripping. addition 2-ethylhexyl phosphonic acid mono-2-ethylhexy ester (P507) as modifier to significantly enhances stripping efficiency by controlling Fe3+ coordination. However, performance other acidic extractants similar P507 has not yet been investigated. In this work, we systematically compared four most commonly used commercial...
The concept of introducing intramolecular noncovalent conformational locks into the polymer main chain was implemented to improve coplanarity linked-acceptor polymers. As a result, novel shows best power conversion efficiency 8.18%.
Abstract Lithium is becoming increasingly important due to its indispensable role in lithium‐ion batteries. The direct extraction of lithium from salt lakes, which are a main source lithium, challenging the coexistence many interfering alkali and alkaline earth metals. In this work, we report that synergistic solvent (SSX) system containing 2,9‐dialkyl‐1,10‐phenanthroline hydrophobic anion ([NTf 2 ] − ) could extract selectively with high loading capacity solutions both (sodium, potassium)...
The landscape of possible polymorphs for some metal–organic frameworks (MOFs) can pose a challenge controlling the outcome their syntheses. Demonstrated here is use template to control in vapor-assisted formation zeolitic imidazolate framework (ZIF) powders and thin films. Introducing small amount either ethanol or dimethylformamide vapor during reaction between ZnO 4,5-dichloroimidazole results porous ZIF-71 phase, whereas other conditions lead dense ZIF-72 phase amorphous materials....
Metal halide perovskites draw increasing attention as photodetector materials due to their strong visible light absorption and resulting photocurrent. The development of efficient fabrication routes realize high‐resolution perovskite pixel arrays is critical enable practical devices. Herein, a dry lift‐off process fabricate methylammonium lead iodide (MAPbI 3 ) pixels on different substrates reported, with resolution down 5 μm. Accordingly, 8 × 10 are fabricated both glass flexible...
Alloy-like domain structure and energy transfer coexist in the ternary system, which maximum PCE of 11.1% is obtained.
In this work, a zeolitic imidazolate framework-8 (ZIF-8)-coated coupled resonant sensor was fabricated using solvent-free method. The method avoids the use of solvents for ZIF-8 synthesis, which eliminates risk device contamination, corrosion, or destruction. This process enables batch fabrication ZIF-8-coated resonators at wafer level. By tracking shifts in frequency and amplitude ratio, demonstrates strong responses to ethanol vapor different concentrations exhibits good reversible...
A linked-acceptor type conjugated polymer is designed and sythesized based on 4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophene (BDTT) linked-thieno[3,4-c]pyrrole-4,6-dione (LTPD). This uses alkyl-substituted thiophene as a bridge. The PBDTT-LTPD includes two TPD units in one repeating unit, which can enhance acceptor density the backbone lower highest occupied molecular orbital (HOMO) level. By contrast, variable alkyl substitutions thiophene-bridges ensure subtle...
Abstract The polyhedral shape and fragile nature of single crystals metal–organic frameworks (MOFs) hinder their processing using standard microfabrication techniques. As a result, the fabrication surface patterns microelectrodes on MOF is challenging, which limits both direct electrical interrogation in research integration into optical devices. Herein, new strategy to readily fabricate surface‐embossed micropatterns surface‐embedded gold electrodes space‐confined, one‐step solvothermal...
A novel random copolymer based on donor⁻acceptor type polymers containing benzodithiophene and dithienosilole as donors benzothiazole diketopyrrolopyrrole acceptors was designed synthesized by Stille copolymerization, their optical, electrochemical, charge transport, photovoltaic properties were investigated. This with high molecular weight exhibited broad strong absorption covering the spectra range from 500 to 800 nm maxima at around 750 nm, which would be very conducive obtaining large...
Breaking of <bold>BDT</bold> to form <bold>PDT</bold> units enhanced the planarity molecular backbone and absorption. The resulting organic photovoltaic device showed a highest PCE 6.64% with high <italic>J</italic><sub>sc</sub> 12.74 mA cm<sup>−2</sup>.
With the development of diversity non-fullerene acceptors, it is found that there no clear boundary between electron donors and acceptors. Modulation donating withdrawing properties organic semiconductors necessary for photovoltaics research. In this work, we designed synthesized three A1–D–A2–D–A1-type (A represents acceptor unit D donor unit) small molecules, named as M-0F, M-1F M-2F respectively containing zero, one two fluorine atoms in terminal segments (A1), respectively. Fluorination...
ABSTRACT Most of the narrow band‐gap polymers exhibit low open‐circuit voltage ( V oc ) which limits further improvement photovoltaic performance. How to improve through fine tuning chemical structure is a significant project that worth exploring. As big and strong electron accepting unit, fluorinated‐quinoxaline based copolymers always show band gap broad absorption makes it good template study changes tuning. In this work, effect subtle modulation polymer side chains main chain on...
Abstract The landscape of possible polymorphs for some metal–organic frameworks (MOFs) can pose a challenge controlling the outcome their syntheses. Demonstrated here is use template to control in vapor‐assisted formation zeolitic imidazolate framework (ZIF) powders and thin films. Introducing small amount either ethanol or dimethylformamide vapor during reaction between ZnO 4,5‐dichloroimidazole results porous ZIF‐71 phase, whereas other conditions lead dense ZIF‐72 phase amorphous...
Grayscale masks have been applied in high-end stereolithography (SLA) 3D printers to spatially define the degree of photopolymerization and fabricate objects with graded properties. However, this approach cannot be many commonly used projection SLA that can only handle 1-bit slices. Based on dithering techniques image-processing algorithms, we develop a digital halftoning generate universally printable files consisting black white pixels arranged mimic "true" grayscale levels. Using...