A5029664198- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Electrocatalysts for Energy Conversion
- Molecular Junctions and Nanostructures
- Organic Light-Emitting Diodes Research
- TiO2 Photocatalysis and Solar Cells
- Quantum Dots Synthesis And Properties
- Analytical Chemistry and Sensors
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Photoreceptor and optogenetics research
- Electrowetting and Microfluidic Technologies
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor Quantum Structures and Devices
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Advanced battery technologies research
- Luminescence and Fluorescent Materials
- Solar-Powered Water Purification Methods
- Fullerene Chemistry and Applications
- Advanced Nanomaterials in Catalysis
Imperial College London
2020-2024
Pusan National University
2023-2024
Ulsan National Institute of Science and Technology
2013-2021
Government of the Republic of Korea
2016-2021
A series of wide-bandgap (WBG) copolymers with different alkyl side chains are synthesized. Among them, copolymer PBT1-EH moderatly bulky on the acceptor unit shows best photovoltaic performance power conversion efficiency over 10%. The results suggest that side-chain engineering is an effective strategy to further tuning optoelectronic properties WBG copolymers.
Organic photovoltaics are a promising candidate for indoor applications. Recent progresses in optimization of photovoltaic materials and devices, the key strategies to optimize characteristics will be discussed.
The non-fullerene acceptors (NFAs) employed in state-of-art organic photovoltaics (OPVs) often exhibit strong quadrupole moments which can strongly impact on material energetics. Herein, we show that changing the orientation of Y6, a prototypical NFA, from face-on to more edge-on by using different processing solvents causes significant energetic shift up 210 meV. this OPV performance is investigated both bilayer and bulk-heterojunction (BHJ) devices with PM6 polymer donor. device electronic...
Four different kinds of photovoltaic polymers were synthesized by controlling the intrachain noncovalent coulomb interactions through incorporation alkoxy- or alkylthio-substituted phenylene, 4,7-di(furan-2-yl)benzothiadiazole, and 4,7-di(thiophen-2-yl)benzothiadiazole as a building block. Fine modulation interplay dipole–dipole, H-bond, chalcogen–chalcogen (O···S, O···H, S···S, S···F, etc.) along polymeric backbone influenced chain planarity, interchain organization, film morphology,...
Abstract A new donor (D)–acceptor (A) conjugate, benzodithiophene‐rhodanine–[6,6]‐phenyl‐C 61 butyric acid methyl ester (BDTRh–PCBM) comprising three covalently linked blocks, one of p‐type oligothiophene containing BDTRh moieties and two n‐type PCBM, is designed synthesized. single component organic solar cell (SCOSC) fabricated from BDTRh–PCBM exhibits the power conversion efficiency (PCE) 2.44% maximum external quantum 46%, which are highest among reported efficiencies so far. The SCOSC...
This study demonstrates high‐performance, ternary‐blend polymer solar cells by modifying a binary blend bulk heterojunction (PPDT2FBT:PC 71 BM) with the addition of ternary component, PPDT2CNBT. PPDT2CNBT is designed to have complementary absorption and deeper frontier energy levels compared PPDT2FBT, while being based on same polymeric backbone. A power conversion efficiency 9.46% achieved via improvements in both short‐circuit current density ( J SC ) open‐circuit voltage V OC )....
Abstract Semiconducting lead halide perovskite nanocrystals (PNCs) are regarded as promising candidates for next‐generation optoelectronic devices due to their solution processability and outstanding properties. While the field of light‐emitting diodes (LEDs) photovoltaics (PVs), two prime examples devices, has recently seen a multitude efforts toward high‐performance PNC‐based realizing both with high efficiencies stabilities through single PNC processing strategy remained challenge. In...
In this contribution, we report the working mechanisms of several processing additives for controlling morphology four all-polymer systems.
Diphenyl ether acts as a predominant processing additive regardless of the polymer crystallinity in bulk-heterojunction solar cells.
We synthesized three semicrystalline polymers (PTTBTBO, PDTBTBO, and P2FDTBTBO) by modulating the intra- intermolecular noncovalent Coulombic interactions investigated their photovoltaic characteristics under various light intensities. Low series (Rs) high shunt (Rsh) resistances are essential prerequisites for good device properties standard illumination (100 mW cm–2). Considering these factors, among polymers, PDTBTBO polymer solar cells (PSCs) exhibited most desirable characteristics,...
Solution-processed bilayer organic solar cells (OSCs) with high performance are demonstrated for nonfullerene small molecular acceptors (NFAs). Unlike fullerene acceptors, NFAs show significant spectral overlap between their absorption and the photoluminescence (PL) of a polymer donor, which makes design an efficient exciton-harvesting heterojunction possible. Efficient exciton diffusion in is realized by long-range energy transfer donor NFAs. We observed from polymer/NFA heterojunctions via...
Abstract While non‐fullerene acceptors (NFAs) have recently been demonstrated to exhibit long‐range exciton diffusion, most organic photovoltaic and photodetector studies still focus on blended polymer: NFA systems. Herein, a 40 nm diffusion length for IT4F excitons is determined, it that sharp interface, planar heterojunction (PHJ) IT4F/PM6 devices with the layer thickness matched this yield optimized performance. The PHJ an enhanced device open‐circuit voltage relative bulk (BHJ) devices,...
Photoelectrochemical (PEC) devices offer a promising platform toward direct solar light harvesting and chemical storage through artificial photosynthesis. However, most prototypes employ wide bandgap semiconductors, moisture-sensitive inorganic absorbers, or corrosive electrolytes. Here, the design assembly of PEC based on an organic donor-acceptor bulk heterojunction (BHJ) using carbon-based encapsulant are introduced, which demonstrate long-term H
In this study, we demonstrated the effects of molecular weight (MW) a green processable polymer (asy-PBTBDT) on its photovoltaic performance and thermal stability for first time.
Abstract Organic photovoltaic devices employing bulk heterojunctions (BHJs) of polymer donors and small molecular nonfullerene acceptors have recently demonstrated high performance, with strong visible near‐infrared absorption low energy losses. Such junctions are promising candidates for solar‐driven water splitting; however, the poor underwater stability acceptor in such has limited their viability to date. Here, a stable efficient organic photoanode is oxidation based upon Y6:PM6 BHJ...
A bulk-heterojunction (BHJ) blend is commonly used as the photoactive layer in organic photodetectors (OPDs) to utilize donor (D)/acceptor (A) interfacial energetic offset for exciton dissociation. However, this strategy often complicates optimization procedures, raising serious concerns over device processability, reproducibility, and stability. Herein, highly efficient OPDs fabricated with single-component semiconductors are demonstrated via solution-processing. The non-fullerene acceptors...
Abstract Photogenerating charges with long lifetimes to drive catalysis is challenging in organic semiconductors. Here, the role of a PM6 polymer overlayer on photoexcited carrier dynamics investigated Y6:PM6 bulk‐heterojunction (BHJ) photoanode undergoing ascorbic acid oxidation. With additional layer, hole lifetime increased solid state BHJ film. When electrically coupled hydrogen‐evolving platinum cathode, remarkably long‐lived polaron states are observed timescale seconds under...
Two small molecule donor materials (DTGe(FBTTh 2 ) and DTGe(FBTBFu) incorporating the dithienogermole (DTGe) moiety with fluorobenzothiadiazole (FBT) bithiophene (Th or benzofuran (BFu) end‐capping groups are synthesized their properties as in bulk heterojunction type (BHJ) solar cells investigated. The DTGe(FBTTh Th end shows outstanding cell characteristics efficiencies up to 6.4% using a standard BHJ architecture 7.3% ZnO optical spacer, while BFu end‐capped has slightly wider band gaps...
Replacing ZnO with PEIE, both as a surface modifier for the low work function electrode and an electron selective layer, enhances performance air stability of inverted polymer solar cells by improving transport, wettability between active layer cathode, maximizing light absorption within without interference.
Fine modulation of chain linearity suggests an effective way to control interchain ordering for specific application in polymer solar cells or field effect transistors.
In the field of organic solar cells, it has been generally accepted until recently that a difference in band energies at least 0.3 eV between highest occupied molecular orbital (HOMO) level donor and HOMO acceptor is required to provide adequate driving force for efficient photoinduced hole transfer due large binding energy excitons materials. this work, we investigate polymeric donor:non-fullerene junctions binary ternary blend polymer which exhibit despite negligible offset demonstrate...