A5039037380- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Thin-Film Transistor Technologies
- Organic Light-Emitting Diodes Research
- Liquid Crystal Research Advancements
- Block Copolymer Self-Assembly
- solar cell performance optimization
- Engineering Applied Research
- Advanced Polymer Synthesis and Characterization
- Silicon and Solar Cell Technologies
- Nanowire Synthesis and Applications
- Advanced Materials and Mechanics
- Photochromic and Fluorescence Chemistry
- Molecular Junctions and Nanostructures
- Fullerene Chemistry and Applications
- Quantum Dots Synthesis And Properties
- Advancements in Photolithography Techniques
- 2D Materials and Applications
- ATP Synthase and ATPases Research
- Nanopore and Nanochannel Transport Studies
- Dielectric materials and actuators
- Neuroscience and Neural Engineering
- Engineering Structural Analysis Methods
- Advanced Welding Techniques Analysis
Chung-Ang University
2022-2024
Yonsei University
2012-2024
University of Pennsylvania
2021-2022
Hanbat National University
2021
Korea Advanced Institute of Science and Technology
2014-2020
Daejeon University
2017-2020
Government of the Republic of Korea
2017-2020
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...
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...
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.
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...
High power conversion efficiency (PCE) and long-term stability are important requirements for commercialization of organic solar cells (OSCs). In this study, we demonstrate efficient (PCE = 18.60%) stable (t80% lifetime > 4000 h) OSCs by developing a series dimerized small-molecule acceptors (DSMAs). We prepared three different DSMAs (DYT, DYV, DYTVT) using linkers (i.e., thiophene, vinylene, thiophene– vinylene– thiophene), to connect their two Y-based building blocks. find that the...
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...
Molecular orientation, with respect to donor/acceptor interface and electrodes, plays a critical role in determining the performance of all‐polymer solar cells (all‐PSCs), but is often difficult rationally control. Here, an effective approach for tuning molecular crystallinity orientation naphthalenediimide‐bithiophene‐based n‐type polymers (P(NDI2HD‐T2)) by controlling their number average weights ( M n ) reported. A series P(NDI2HD‐T2) different 13.6 P L ), 22.9 49.9 kg mol −1 H are...
We report a systematic investigation of the correlations between electron mobility polymer acceptors and photovoltaic performances all-polymer solar cells (all-PSCs) by using series naphthalene diimide (NDI)-based acceptors. Polymer typically have much lower than fullerenes, which is one main factors in limiting performance all-PSCs. In addition, anisotropic charge transport properties polymers require careful control their packing structure orientation suitable for use To planarity backbone...
Side-chain fluorination of polymers is demonstrated as a highly effective strategy to improve the efficiency all-polymer solar cells from 2.93% (nonfluorinated P1) 7.13% (fluorinated P2). This significant enhancement achieved by synergistic improvements in open-circuit voltage, charge generation, and transport, donor polymer optimizes band alignment film morphology. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed...
We report highly efficient all-polymer solar cells with power conversion efficiencies of over 4.5% by intermixed blends PTB7-Th donor and P(NDI2OD-T2) acceptor polymers. The low interfacial tension the face-on π-π stackings afforded desired nanophase morphology, which facilitates charge transport from active layer to each electrode. In addition, incorporation 1,8-diiodooctane additives was able tune degree crystallinity orientation acceptors, resulting in remarkable enhancement electron...
The control of the bulk-heterojunction (BHJ) morphology in polymer/polymer blends remains a critical hurdle for optimizing all-polymer solar cells (all-PSCs). relationship between donor/acceptor phase separation, domain size, and resulting photovoltaic characteristics PDFQx3T P(NDI2OD-T2)-based all-PSCs was investigated. We varied film-processing solvents (chloroform, chlorobenzene, o-dichlorobenzene, p-xylene), thereby manipulating separation with size range 30–300 nm. different volatility...
High fracture resistance of polymer solar cells (PSCs) is great importance to ensure long-term mechanical reliability, especially considering their potential in roll-to-roll printing processes and flexible devices. In this paper, we compare properties, such as the cohesive energy, elastic modulus, crack-onset strain, all-polymer (all-PSCs) fullerene-based (PCBM–PSCs) based on same, representative low-bandgap donor (PTB7-Th) a function acceptor content. The all-PSCs exhibit higher energy...
Abstract The branching point of the side‐chain naphthalenediimide (NDI)‐based conjugated polymers is systematically controlled by incorporating four different side‐chains, i.e., 2‐hexyloctyl (P(NDI1‐T)), 3‐hexylnonyl (P(NDI2‐T)), 4‐hexyldecyl (P(NDI3‐T)), and 5‐hexylundecyl (P(NDI4‐T)). When located farther away from backbones, steric hindrance around backbone relaxed intermolecular interactions between polymer chains become stronger, which promotes formation crystalline structures in thin...
In this paper, we report and discuss our successful synthesis of monodispersed, polystyrene-coated gold core-shell nanoparticles (Au@PS NPs) for use in highly efficient, air-stable, organic light-emitting diodes (OLEDs) photovoltaics (OPVs). These NPs retain the dual functions (1) plasmonic effect Au core (2) stability solvent resistance cross-linked PS shell. The monodispersed Au@PS were incorporated into a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) film that was...
A novel framework of azide containing photo‐crosslinkable, conducting copolymer, that is, poly(azido‐styrene)‐random‐poly(triphenylamine) (X‐PTPA), is reported as a hole‐transporting material for efficient solution‐processed, multi‐layer, organic light emitting diodes (OLEDs). facile and energy‐efficient crosslinking process demonstrated with UV irradiation (254 nm, 2 mW/cm ) at short exposure time (5 min). By careful design X‐PTPA, in which 5 mol% the photo‐crosslinkable poly(azido‐styrene)...
We report eco- and human-friendly fabrication of organic field-effect transistors (OFETs) polymer solar cells (PSCs) using only ethanol as a processing solvent at ambient condition, in stark contrast to that involving the use halogenated and/or aromatic solvents. New ethanol-processable electroactive materials, p-type (PPDT2FBT-A) n-type bis-adduct fullerene acceptor (Bis-C60-A) are designed rationally by incorporation oligoethylene glycol (OEG) side-chains. By processing, PPDT2FBT-A shows...
We delineate the important role of 2D conjugated alkylthiophene side chains polymers in manipulating molecular orientation and ordering at polymer donor/polymer acceptor (PD/PA) interface as well composition variations blend active layer all-polymer solar cells (all-PSCs). To systematically investigate impact on performance all-PSCs, we synthesized a series poly(benzo[1,2-b:4,5-b̀]-dithiophene-thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) donors with different contents alkoxy chains, from 0 to...
Nanostructured materials with precisely defined and water-bicontinuous 1-nm-scale pores are highly sought after as advanced for next-generation nanofiltration membranes. While several self-assembled systems appear to satisfy this need, straightforward fabrication of such submicron films high-fidelity retention their ordered nanostructure represents a nontrivial challenge. We report the development lyotropic liquid crystal mesophase that addresses aforementioned issue. Films thin ∼200 nm...
Dynamin-related protein-1 (Drp1) plays a critical role in mitochondrial fission which allows cell proliferation and Mdivi-1, specific small molecule Drp1 inhibitor, is revealed to attenuate proliferation. However, few molecular mechanisms-related under stimulus for restenosis or atherosclerosis have been investigated vascular smooth muscle cells (vSMCs). Therefore, we hypothesized that inhibition can prevent its regulatory mechanism. Angiotensin II (Ang II) hydrogen peroxide (H2 O2 )-induced...