A5091548013- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Organic Light-Emitting Diodes Research
- Conducting polymers and applications
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Electrowetting and Microfluidic Technologies
- Advanced Sensor and Energy Harvesting Materials
- Advanced Memory and Neural Computing
- Advanced Chemical Sensor Technologies
- Perovskite Materials and Applications
- Transition Metal Oxide Nanomaterials
- Photonic and Optical Devices
- CCD and CMOS Imaging Sensors
- Nanofabrication and Lithography Techniques
- Optical Coatings and Gratings
- Nonlinear Optical Materials Research
- Photochromic and Fluorescence Chemistry
- Chalcogenide Semiconductor Thin Films
- Diamond and Carbon-based Materials Research
- ZnO doping and properties
- Advanced Optical Imaging Technologies
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Semiconductor materials and devices
Pohang University of Science and Technology
2021-2023
Dongguk University
2015-2018
King Abdulaziz University
2016
Abdullah Gül University
2016
Kyocera (United States)
2016
Linköping University
2016
Dong-A University
2006-2012
A uniform ultrathin polymer film is deposited over a large area with molecularlevel precision by the simple wire-wound bar-coating method. The bar-coated films not only exhibit high transparency of up to 90% in visible wavelength range but also charge carrier mobility degree percolation through uniformly covered nanofibrils. They are capable realizing highly sensitive multigas sensors and represent first successful report ethylene detection using sensor based on organic field-effect transistors.
Understanding the sensing mechanism in organic chemical sensors is essential for improving performance such as detection limit, sensitivity, and other response/recovery time, selectivity, reversibility real applications. Here, we report a highly sensitive printed ammonia (NH3) gas sensor based on thin film transistors (OTFTs) with fluorinated difluorobenzothiadiazole-dithienosilole polymer (PDFDT). These detected NH3 down to 1 ppm high sensitivity (up 56%) using bar-coated ultrathin (<4 nm)...
We report printed flexible optoelectronic sensors composed of red organic light-emitting diodes (OLEDs) and photodiodes (OPDs) for detection various biological signals in a photoplethysmograph (PPG) device. Fabricated OLEDs achieved maximum luminance > 1000 cd/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> at 9 V, with peak 640 nm. Maximum OPD photosensitivity the poly(3-hexylthiophene-2, 5-diyl) phenyl-C61-butyric acid methyl ester...
Although n-type transparent conductors have been commercialized with high optical transmittance and electrical conductivity, the realization of their p-type counterparts has a challenging problem. Here, we report synthesis highly conductive sulfur-doped CuI (CuI:S) thin film using liquid-iodination method thiol additive. The CuI:S shows remarkably conductivity 511 S cm–1 an greater than 80%. Furthermore, additional hole doping H2O2 treatment improves to 596 cm–1. Consequently, exhibits...
The exploration of stable and high-mobility semiconductors that can be grown over a large area using cost-effective methods continues to attract the interest electronics community. However, many mainstream candidates are challenged by scarce expensive components, manufacturing costs, low stability, limitations large-area growth. Herein, we report wafer-scale ultrathin (metal) chalcogenide for high-performance complementary standard room temperature thermal evaporation. n-type bismuth sulfide...
Commercial hydrogen (H2) sensors operate at high temperatures, which increases power consumption and poses a safety risk owing to the flammable nature of H2. Here, polymer-noble metal-metal oxide film is fabricated using spin-coating printing methods realize highly sensitive, low-voltage operation, wide-operating-concentration, near-monoselective H2 sensor room temperature. The with an optimized thickness Pd nanoparticles SnO2 showed extremely response 16,623 time 6 s recovery 5 temperature...
Organic semiconductors (OSCs) are promising sensing materials for printed flexible gas sensors. However, OSCs unstable in the humid air, which limits realization of sensors multiple usages. In this paper, we report a facile and effective way to improve air stability an OSC film realize reversibly used by adding molecular additives. The tetracyanoquinodimethane (TCNQ) or 4-aminobenzonitrile (ABN) additives effectively prevent adsorption moisture from on layer, thereby providing stable sensor...
Low-frequency noise (LFN) in double-gate (DG) In-Ga-Zn-O (IGZO) thin-film transistors (TFTs) is studied to investigate the origin of performance improvement. We found that thinning down IGZO film enhances such improvements. With 7-nm IGZO, mobility raised by a factor 3.77, and subthreshold slope reduced 0.17 V/decade from single-gate DG mode. Device simulations show bulk transport inside emerges as two gates field effects get coupled. The LFN results reveal transition surface disclose...
Printing technologies were applied to fabricate a flexible organic thin-film transistor (OTFT) backplane for electrophoretic displays (EPDs). Various printing processes adopted maximize the figures of each layer OTFT: screen combined with reverse offset gate electrodes and scan bus lines Ag ink, inkjet source/drain glycerol-doped Poly (3,4-ethylenedioxythiophene): (styrenesulfonate) (PEDOT:PSS), semiconductor Triisopropylsilylethynyl (TIPS)-pentacene, pixel paste. A mobility 0.44 cm2/V s was...
Most of the merit organic thin film transistors (OTFTs) is that they can be manufactured using cost effective processes. However, expensive gold (Au) electrodes have usually been used as a source/drain (S/D), due to their benign energy level matching, high air stability, and easy patternability. In this article, we report simple method for improving charge injection from low molybdenum (Mo) electrode semiconductors in OTFTs by incorporating dodecanoic acid (DA)–based self-assembled monolayer...
A precise control over the film thickness is a vital requirement for achievement of high performance in thin-film electronic devices. On page 2752, Y.-Y. Noh and co-workers develop an effective way to deposit large-area uniform ultrathin polymer with molecular-level precision via simple wire-wound bar-coating method high-performance organic transistors gas sensors.
Ultra-thin films of organic molecules can provide new opportunities for unique device applications and guide deeper understanding intrinsic charge transport mechanisms in these materials. In this study, we report an effective way to deposit ultra-thin polymer over a large area with molecular level precision using simple wire-wound bar-coating method. The film thickness...
Single wall carbon nanotubes (SWNT) have been a significant research topic as active layers for thin film transistors (TFTs) due to their high charge carrier mobility beyond that of crystalline silicon. In this study, we report an effective approach achieve very field-effect and on/off ratio solution processed semiconducting SWNT TFTs, by selective doping through contact with ferric chloride (FeCl3) dopant layer. The layer is formed double spin coating the highly purified (>99%) pressure...
We fabricated a color electronic paper display (EPD) by using the charged particles. The has 160 (xRGBW) x 480 array of pixels and four inch diagonal viewing area. Color filter technology was applied for coloration EPD. fabrication process as follows. First, ITO electrodes were patterned on top bottom substrates. Ribs formed to define substrate, filters deposited substrate. particles put into pixel arrays defined ribs. Finally, substrate having assembled resolution with 4 gamut about 2.49%,...