A5038187942- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Advanced Sensor and Energy Harvesting Materials
- Organic Light-Emitting Diodes Research
- Supercapacitor Materials and Fabrication
- Nanowire Synthesis and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- Gas Sensing Nanomaterials and Sensors
- Nanomaterials and Printing Technologies
- Green IT and Sustainability
- Neuroscience and Neural Engineering
- Children's Physical and Motor Development
Gwangju Institute of Science and Technology
2013-2021
RIKEN Center for Emergent Matter Science
2018-2020
RIKEN
2019
Gwangju University
2015
Government of the Republic of Korea
2015
Abstract Extensive efforts have been devoted during the last decade to organic solar cell research that has led remarkable progress and achieved power conversion efficiencies (PCEs) in excess of 10%. Among existing flexible cells, ultrathin cells with a total thickness <10 µm important advantages, including good mechanical bending stabilities conformability. These advantages generation solutions for wearable electronics. In this essay, future directions pertaining these are discussed...
A new tandem architecture for printable photovoltaics using a versatile organic nanocomposite containing photoactive and interfacial materials is demonstrated. The forms an ideal self-organized recombination layer via spontaneous vertical phase separation, which yields simplified structure fabricated with only four component layers high efficiency of 10.8%.
Highly efficient P-I-N type perovskite/bulk-heterojunction (BHJ) integrated solar cells (ISCs) with enhanced fill factor (FF) (≈80%) and high near-infrared harvesting (>30%) are demonstrated by optimizing the BHJ morphology a novel n-type polymer, N2200, new solvent-processing additive. This work proves feasibility of highly ISCs panchromatic absorption as photovoltaic architecture provides important design rules for ISCs. As service to our authors readers, this journal supporting...
Abstract Flexible and biocompatible integrated photo‐charging devices consisting of photovoltaic cells energy storage units can provide an independent power supply for next‐generation wearable electronics or biomedical devices. However, current flexible exhibit low total conversion efficiency large device thickness, hindering their applicability towards efficient stable self‐powered systems. Here, a highly ultra‐thin with approaching 6% thickness below 50 µm is reported, prepared by...
Significance When various electronic appliances used in everyday life become deformable and transparent, they will provide tremendous versatility the design use of see-through, smart mobile applications, exceeding limitations best developed conventional silicon technologies, which are available only rigid, opaque forms. However, even recently discovered innovative semiconducting components have failed to simultaneously achieve such flexibility transparency. Thus, existing options still...
Nucleation and growth processes can be effectively controlled in organic semiconductor films through a new concept of template-mediated molecular crystal seeds during the phase transition; effective control these ensures millimeter-scale domains, as well performance resulting with intrinsic hole mobility 18 cm(2) V(-1) s(-1).
In the past several years, research in soft and flexible electronics has promised to yield developments wearable technology, including health fitness monitoring tools, independence mobility aids for disabled, human-computer interfaces virtual augmented reality. However, as these devices become thinner lighter, they demand efficient power supplies with similar mechanical properties. Organic photovoltaics (OPVs)--known their high flexibility, lightweight, scalable fabrication methods-have...
Flexible organic photovoltaics (OPVs) are promising power sources for wearable electronics. However, it is challenging to simultaneously achieve high efficiency as well good stability under various stresses. Herein, we demonstrate the fabrication of highly efficient (efficiency, 13.2%) and stable OPVs based on nonfullerene blends by a single-step postannealing treatment. The device performance decreases dramatically after annealing at 90 °C fully recovered 150 °C. Glass-encapsulated annealed...
Despite recent breakthroughs in power conversion efficiencies (PCEs), which have resulted PCEs exceeding 22%, perovskite solar cells (PSCs) still face serious drawbacks terms of their printability, reliability, and stability. The most efficient PSC architecture, is based on titanium dioxide as an electron transport layer, requires extremely high‐temperature sintering process (≈500 °C), reveals hysterical discrepancies the device measurement, suffers from performance degradation under light...
Realizing industrial-scale, large-area photovoltaic modules without any considerable performance losses compared with the of laboratory-scale, small-area perovskite solar cells (PSCs) has been a challenge for practical applications PSCs. Highly sophisticated patterning processes achieving series connections, typically fabricated using printing or laser-scribing techniques, cause unexpected efficiency drops and require complicated manufacturing processes. We successfully high-efficiency, PSC...
Vertically self-assembled bilayers with an interfacial bottom layer and a photoactive top are demonstrated via single coating step of blend composed amine-containing nonconjugated polyelectrolyte (NPE) organic electron donor–acceptor bulk heterojunction composite. The NPE reduces the work function indium tin oxide (ITO) cathode, which leads to efficient inverted solar cells without any additional interface engineering ITO.
The advent of special types transparent electrodes, known as “ultrathin metal electrodes,” opens a new avenue for flexible and printable electronics based on their excellent optical transparency in the visible range while maintaining intrinsic high electrical conductivity mechanical flexibility. In this electrode architecture, introducing nucleation inducers (MNIs) plastic substrates is key concept to form high‐quality ultrathin films (thickness ≈ 10 nm) with smooth continuous morphology....
Abstract Flexible and stretchable organic photovoltaics (OPVs) are promising as a power source for wearable devices with multifunctions ranging from sensing to locomotion. Achieving mechanical robustness high conversion efficiency ultraflexible OPVs is essential their successful application. However, it challenging simultaneously achieve these features by the difficulty maintain stable performance under microscale bending radius. Ultraflexible proposed employing novel metal‐oxide‐free...
Abstract Flexible organic photodetectors can form seamless contact with human skin, enabling continuous health monitoring. However, developing flexible high detectivity remains challenging because of the theoretical dark current using a bulk heterojunction (BHJ) structure. Herein, simple approach is reported that integrates field‐effect transistor (FET) and an photodiode (OPD) module on same substrate to achieve ultralow density (3.0 × 10 −8 mA cm −2 ), ultrahigh (1.7 15 Jones), excellent...
The advent of special types polymeric semiconductors, known as "polymer blends," presents new opportunities for the development next-generation electronics based on these semiconductors' versatile functionalities in device applications. Although polymer blends contain semiconducting polymers (SPs) mixed with a considerably high content insulating polymers, few unexpectedly yield much higher charge carrier mobilities than those pure SPs. However, origin such an enhancement has remained...
<italic>In situ</italic>GIWAXS was used to monitor the molecular packing dynamics and phase separation of bulk-heterojunction composites with a processing additive 1-chloronaphthalene.
A series of three new low bandgap donor–acceptor–donor–acceptor/ (D–A–D–A/) polymers have been successfully synthesized based on the combination isoindigo as electron-deficient acceptor and 3,4-ethylenedioxythiophene electron-rich donor, followed by CH-arylation with different acceptors (4,7-dibromo[c][1,2,5]-(oxa, thia, and/or selena)diazole (4a-c)). These were used donor materials for photovoltaic applications. All are highly stable show good solubility in chlorinated solvents. The highest...
Organic semiconductors are key building blocks for future electronic devices that require unprecedented properties of low-weight, flexibility, and portability. However, the low charge-carrier mobility undesirable processing conditions limit their compatibility with low-cost, flexible, printable electronics. Here, we present significantly enhanced field-effect (μ(FET)) in semiconducting polymers mixed boron-doped carbon nanotubes (B-CNTs). In contrast to undoped CNTs, which tend form...
A new strategy for improving the charge extraction in thick bulk heterojunction (BHJ) polymer solar cells (PSCs) is reported. By deposition of a solution‐processed vanadium oxide (s‐VO x ) onto BHJ active layers, conductive charge‐transport channels are formed inside layer via charge‐transfer doping reaction between lone‐pair electrons sulfur atoms and Lewis‐acidic s‐VO . Because significantly reduce recombination films, high internal quantum efficiencies (IQEs) over 80% achieved inverted...
Abstract The tailoring of the chromaticity white organic light‐emitting diodes (WOLEDs) has presented a significant challenge in their application smart lighting sources to improve quality life and human performance. Here, new microcavity WOLED (M‐WOLED) structure modulate emitted light is demonstrated by only adjusting thickness layer. By introducing polymer‐metal hybrid electrode that functions both as partially reflective mirror transparent electrode, very simple architecture does not...
In article number 2000523, Kenjiro Fukuda, Takao Someya and co-workers integrate flexible organic photovoltaics with a carbon nanotube/polymer-based supercapacitor on 1-µm-thick ultrathin substrate, enabling an efficient ultra-flexible design. It exhibits total system efficiency approaching 6% thickness below 50 µm, superior 94.66% retention after 5000 bending cycles at radius of around 2 mm.