A5100615489- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Advanced Polymer Synthesis and Characterization
- Block Copolymer Self-Assembly
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Pickering emulsions and particle stabilization
- Organic Light-Emitting Diodes Research
- Polymer Surface Interaction Studies
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Materials and Technologies
- Nanomaterials for catalytic reactions
- Luminescence and Fluorescent Materials
- Silicon and Solar Cell Technologies
- Analytical Chemistry and Sensors
- Advancements in Battery Materials
- Quantum Dots Synthesis And Properties
- Fullerene Chemistry and Applications
- High Temperature Alloys and Creep
- GaN-based semiconductor devices and materials
- Fatigue and fracture mechanics
- Fuel Cells and Related Materials
- Nanowire Synthesis and Applications
- Advanced Condensed Matter Physics
Korea Advanced Institute of Science and Technology
2016-2025
Chungbuk National University
2024
Korea University
2000-2024
Lawrence Berkeley National Laboratory
2007-2024
Korea Research Institute of Chemical Technology
2024
Veeco (United States)
2021-2024
Daegu Gyeongbuk Institute of Science and Technology
2024
Catholic University of Korea
2024
Institute for Basic Science
2015-2023
Pohang University of Science and Technology
2023
Abstract All-polymer solar cells have shown great potential as flexible and portable power generators. These devices should offer good mechanical endurance with high power-conversion efficiency for viability in commercial applications. In this work, we develop highly efficient mechanically robust all-polymer that are based on the PBDTTTPD polymer donor P(NDI2HD-T) acceptor. systems exhibit of 6.64%. Also, proposed even better performance than control polymer-fullerene phenyl-C 61 -butyric...
A simple procedure is described to incorporate gold nanoparticles and control their location within symmetric poly(styrene-b-2 vinyl pyridine) (PS-PVP) diblock copolymers. Gold coated with thiol-terminated PS and/or PVP homopolymer chains (Mn ∼ 1300 1500 g/mol, respectively) are incorporated into alternating lamellar layers of (total Mn 196 500 g/mol). The the particles controlled by varying composition ligands on particle surfaces. In particular, 100% or reside near center respective...
All-polymer solar cells (all-PSCs), consisting of conjugated polymers as both electron donor (PD) and acceptor (PA), have recently attracted great attention. Remarkable progress has been achieved during the past few years, with power conversion efficiencies (PCEs) now approaching 8%. In this Account, we first discuss major advantages all-PSCs over fullerene-polymer (fullerene-PSCs): (i) high light absorption chemical tunability PA, which affords simultaneous enhancement short-circuit current...
A comparison of three samples poly(3-hexylthiophene) having regioregularities 86, 90, and 96% is used to elucidate the effect regioregularity on polymer-fullerene-composite solar cell performance. It observed that polymer with lower are capable generating fullerene composites exhibit superior thermal stability. The enhanced stability attributed a driving force for crystallization in less regioregular samples, which supported two-dimensional grazing incidence X-ray scattering differential...
The molecular weight of a conjugated polymer is one the key factors determining electrical, morphological, and mechanical properties as well its solubility in organic solvents miscibility with other polymers. In this study, series semicrystalline poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) polymers different number-average weights (M(n)'s) (PPDT2FBT(L), M(n) = 12 kg/mol; PPDT2FBT(M), 24 PPDT2FBT(H), 40 kg/mol) were...
The effectiveness of side-chain engineering is demonstrated to produce highly efficient all-polymer solar cells (efficiency 5.96%) using a series naphthalene diimide-based polymer acceptors with controlled side chains. dramatic changes in the packing, blend morphology, and electron mobility elucidate clear trends photovoltaic performances.
Abstract Photocrosslinkable bromine‐functionalized poly(3‐hexylthiophene) (P3HT‐Br) copolymers designed for application in solution‐processed organic photovoltaics are prepared by copolymerization of 2‐bromo‐3‐(6‐bromohexyl) thiophene and 2‐bromo‐3‐hexylthiophene. The monomer ratio is carefully controlled to achieve a UV photocrosslinkable layer while retaining the π–π stacking feature conjugated polymers. new materials used as electron donors both bulk heterojunction (BHJ) bilayer type...
Control of interfacial interactions leads to a dramatic change in shape and morphology for particles based on poly(styrene-b-2-vinylpyridine) diblock copolymers. Key these changes is the addition Au-based surfactant nanoparticles (SNPs) which are adsorbed at interface between block copolymer-containing emulsion droplets surrounding amphiphilic afford asymmetric, ellipsoid particles. The mechanism formation novel nanostructures was investigated by systematically varying volume fraction SNPs,...
While the regioregularity (RR) of conjugated polymers is known to have a strong influence on their inherent properties, systematic study RR effect has been limited due lack synthetic methodology. Herein, we successfully produced series poly(3-hexylthiophene)s (P3HTs) having wide range from 64 98%. Incorporation controlled amounts head-to-head (H–H) coupled dimer in modified Grignard metathesis polymerization allows facile tuning P3HTs with comparable molecular weight and low polydispersity....
Despite the recent breakthroughs of polymer solar cells (PSCs) exhibiting a power conversion efficiency over 17%, toxic and hazardous organic solvents such as chloroform chlorobenzene are still commonly used in their fabrication, which impedes practical application PSCs. Thus, development eco-friendly processing methods suitable for industrial-scale production is now considered an imperative research focus. This Review provides roadmap design efficient photoactive materials that compatible...
Abstract The energy level alignment of the perovskite and hole transporting materials (HTMs) is essential for increasing open‐circuit voltage ( V oc ) enhancing performance solar cells (PSCs). In this work, new sequentially fluorinated poly(triarylamine) polymers (PTAA, 1F‐PTAA, 2F‐PTAA) with tuned highest occupied molecular orbital (HOMO) levels are developed applied as HTMs into PSCs. fluorination approach successfully leads to stepwise downshifting HOMO PTAA derivatives, resulting in an...
Abstract Narrow‐bandgap n‐type polymers with high electron mobility are urgently demanded for the development of all‐polymer solar cells (all‐PSCs). Here, two regioregular narrow‐bandgap polymer acceptors, L15 and MBTI, electron‐deficient segments synthesized by copolymerizing dibrominated fused‐ring acceptors (FREA) distannylated aromatic imide, respectively. Taking full advantage FREA both show narrow bandgap mobility. Benefiting from more extended absorption, better backbone ordering,...
Tuning the side chains of conjugated polymers is a simple, yet effective strategy for modulating their structural and electrical properties, but impact on n‐type has not been studied extensively, particularly in area all‐polymer solar cells (all‐PSCs). Herein, effects chain engineering P(NDI2OD‐T2) polymer (also known as Polyera Activink N2200) are investigated, which most widely used all‐PSCs organic field‐effect transistors (OFETs), electronic properties. A series...
Abstract Colloidal particles with controlled shape and internal structure have attracted great attention due to their novel morphologies various potential applications. Among the diverse synthetic strategies toward anisotropically shaped polymer particles, facile accurate engineering of such structures remains challenging. This review highlights approaches manipulate driven by phase separation in emulsions upon solvent evaporation. And, special is given thermodynamic kinetic principles...
The photophysical tuning is reported for a series of tetraphenylphosphonium (TPP) metal halide hybrids containing distinct halides, TPP2 MXn (MXn =SbCl5 , MnCl4 ZnCl4 ZnCl2 Br2 ZnBr4 ), from efficient phosphorescence to ultralong afterglow. afterglow properties TPP+ cations could be suspended the low band gap emissive species, such as SbCl52- and MnCl42- but significantly enhanced wide non-emissive ZnCl42- . Structural studies reveal that attributed stronger π-π stacking intermolecular...
Sodium-metal batteries (SMBs) are considered as a compliment to lithium-metal for next-generation high-energy because of their low cost and the abundance sodium (Na). Herein, 3D nanostructured porous carbon particle containing carbon-shell-coated Fe nanoparticles (PC-CFe) is employed highly reversible Na-metal host. PC-CFe has unique hierarchy based on sub-micrometer-sized particles, ordered open channels, evenly distributed carbon-coated (CFe) surface. achieves high reversibility Na...
Abstract All‐polymer solar cells (all‐PSCs) are a highly attractive class of photovoltaics for wearable and portable electronics due to their excellent morphological mechanical stabilities. Recently, new types polymer acceptors ( P A s) consisting non‐fullerene small molecule (NFSMAs) with strong light absorption have been proposed enhance the power conversion efficiency (PCE) all‐PSCs. However, polymerization NFSMAs often reduces entropy mixing in PSC blends prevents formation intermixed...
Confined assembly of block copolymers (BCPs) is receiving increasing attention due to the ability create unconventional morphologies that cannot be observed in corresponding bulk systems. This effect further driven by simplicity and versatility these procedures for controlling shape particles prepared 3D soft confinement BCPs emulsions. By taking advantage a mobile emulsion interface, one-step formation nonspherical BCP through spontaneous deformation possible with design principles...
We develop an effective strategy to obtain polymer solar cells with high power conversion efficiency (17%) and remarkable mechanical robustness, by design of donors aliphatic flexible spacer incorporated into a rigid backbone.
High efficiency and mechanical robustness are both crucial for the practical applications of all-polymer solar cells (all-PSCs) in stretchable wearable electronics. In this regard, a series new polymer acceptors (PA s) is reported by incorporating flexible conjugation-break spacer (FCBS) to achieve highly efficient mechanically robust all-PSCs. Incorporation FCBS affords effective modulation crystallinity pre-aggregation PA s, achieves optimal blend morphology with donor (PD ), increasing...