A5004605327- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Conducting polymers and applications
- Semiconductor materials and devices
- Perovskite Materials and Applications
- Advanced Memory and Neural Computing
- 2D Materials and Applications
- Thin-Film Transistor Technologies
- Ferroelectric and Negative Capacitance Devices
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Quantum Dots Synthesis And Properties
- Luminescence and Fluorescent Materials
- GaN-based semiconductor devices and materials
- Advanced Photocatalysis Techniques
- Silicon Nanostructures and Photoluminescence
- ZnO doping and properties
- Advanced Fiber Laser Technologies
- Ga2O3 and related materials
- Supercapacitor Materials and Fabrication
- Photonic and Optical Devices
- MXene and MAX Phase Materials
- Advancements in Battery Materials
National Taiwan University
2016-2025
Industrial Technology Research Institute
2003-2024
ITRI International
2017
Institute of Electronics
2002-2016
National Science and Technology Council
2016
Eastern Virginia Medical School
2015
National Cheng Kung University
2014
National Tsing Hua University
2008
National Taiwan Normal University
2008
Institute of Chemistry, Academia Sinica
2008
We realized photovoltaic operation in large-scale MoS2 monolayers by the formation of a type-II heterojunction with p-Si. The monolayer introduces built-in electric field near interface between and p-Si to help photogenerated carrier separation. Such device achieves power conversion efficiency 5.23%, which is highest among all transition-metal dichalcogenide-based solar cells. demonstrated results MoS2/Si-based cells hold promise for integration 2D materials commercially available Si-based...
We demonstrate the improvement of an indium tin oxide anode contact to organic light emitting device via oxygen plasma treatment. Enhanced hole-injection efficiency improves dramatically performance single-layer doped-polymer devices: drive voltage drops from >20 <10 V, external electroluminescence quantum (backside emission only) increases by a factor 4 (from 0.28% 1%), much higher current can be applied achieve brightness (maximum ∼10,000 cd/m2 at 1000 mA/cm2), and...
Monolayer molybdenum disulfide (MoS2) has become a promising building block in optoelectronics for its high photosensitivity. However, sulfur vacancies and other defects significantly affect the electrical optoelectronic properties of monolayer MoS2 devices. Here, highly crystalline diselenide (MoSe2) monolayers have been successfully synthesized by chemical vapor deposition (CVD) method. Low-temperature photoluminescence comparison MoSe2 reveals that shows much weaker bound exciton peak;...
Blue electrophosphorescence in organic light-emitting diodes (OLEDs) is enhanced by the use of 3,6-bis(triphenylsilyl)carbazole (see figure). This carbazole derivative with sterically bulky and large-gap triphenylsilyl groups an electrochemically morphologically stable efficient host material for blue electrophosphorescence. When utilized OLEDs, high efficiencies up to 16 %, 30.6 cd A–1, 26.7 lm W–1 are achieved.
Novel ter(9,9-diarylfluorene)s were synthesized by a Suzuki-coupling reaction of 2-bromofluorene (1) and 2,7-fluorenediboronic ester derivatives (3) with high isolated yields (63-86%). The X-ray structure analysis ter(9,9'-spirobifluorene) (4aa) revealed that the conjugated chromophore adopts helical conformation. This conformation effectively releases steric interaction between fluorene moieties prevents inter-chromophore interactions. introduction aryl groups at C9 position was highly...
Bright & blue: A strategy for reducing metal-chelate internal strain enables the preparation of blue emitting iridium(III) carbene complexes (see picture; Ir red, N light blue, F green). The phosphorescent OLED fabricated from one these shows remarkable CIE coordinates (0.16, 0.13) and peak efficiencies 6.0 % photons per electron, 6.3 cd A−1, 4.0 lm W−1.
The production of renewable solar fuel through CO2 photoreduction, namely artificial photosynthesis, has gained tremendous attention in recent times due to the limited availability fossil-fuel resources and global climate change caused by rising anthropogenic atmosphere. In this study, graphene oxide (GO) decorated with copper nanoparticles (Cu-NPs), hereafter referred as Cu/GO, been used enhance photocatalytic reduction under visible-light. A rapid one-pot microwave process was prepare...
The exciplex forming co‐host with phosphorescent dopant system has potential to realize highly efficient organic light emitting didoes (PhOLEDs). However, the for blue OLEDs been rarely introduced because of higher triplet level than green and red dopants. In this work, a novel high energy is developed by mixing phosphine oxide based electron transporting material, PO‐T2T, hole N , ′‐dicarbazolyl‐3,5‐benzene (mCP). Photo‐physical analysis shows that exciplexes are formed efficiently in host...
A flexible triboelectric nanogenerator (FTENG) based on wavy-structured Kapton film and a serpentine electrode stretchable substrates is presented. The as-fabricated FTENG capable of harvesting ambient mechanical energy via both compressive stretching modes. Moreover, the can be bendable power source to work curved surfaces; it also adaptively attached onto human skin for monitoring gentle body motions.
Mechanically triturated n- and p-type Bi2Te3 nanoparticles, the nanoscale topological insulators (TIs), are employed as nonlinear saturable absorbers to passively mode-lock erbium-doped fiber lasers (EDFLs) for sub-400 fs pulse generations. A novel method is proposed enable control on self-amplitude modulation (SAM) of TI by adjusting its dopant type. The type only shifts Fermi level without changing energy bandgap, that nanoparticles have shown broadband absorption at 800 1570 nm. In...
Current methods of chemical vapour deposition (CVD) graphene on copper are complicated by multiple processing steps and high temperatures required in both preparing the inducing subsequent film growth. Here we demonstrate a plasma-enhanced CVD chemistry that enables entire process to take place single step, at reduced (<420 °C), matter minutes. Growth foils is found nucleate from arrays well-aligned domains, ensuing films possess sub-nanometre smoothness, excellent crystalline quality, low...
Recent SRAM-based computation-in-memory (CIM) macros enable mid-to-high precision multiply-and-accumulate (MAC) operations with improved energy efficiency using ultra-small/small capacity (0.4-8KB) memory devices. However, advanced CIM-based edge-AI chips favor multiple mid/large SRAM-CIM macros: high input (IN) and weight (W) to reduce the frequency of data reloads from external DRAM, avoid need for additional SRAM buffers or ultra-large on-chip buffers. enlarging throughput increases delay...
SRAM-based computing in memory (SRAM-CIM) is an attractive approach to improve the energy efficiency (EF) of edge-AI devices performing multiply-and-accumulate (MAC) operations. SRAM-CIM with a large capacity enhances EF by reducing data movement between system and compute functions. High-precision inputs (IN), weights (W) outputs (OUT) are essential deliver sufficient inference accuracy using SRAM-CIM. These must also enable short latency <tex xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Interface carrier recombination currently hinders the performance of hybrid organic-silicon heterojunction solar cells for high-efficiency low-cost photovoltaics. Here, we introduce an intermediate 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC) layer into based on silicon nanowires (SiNWs) and conjugate polymer poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS). The highest power conversion efficiency reaches a record 13.01%, which is largely ascribed to modified...
True-blue Ir(III) phosphors are designed, synthesized, and applied to multilayered organic true-blue-light-emitting diodes with CIEx,y color chromaticity of (0.15,0.11) maximum external quantum efficiency ∼12%, demonstrating unprecedented performance among all blue-phosphorescent OLEDs ever documented. The molecular-design strategy subsequent device-fabrication protocol reveal a major development in OLEDs. Detailed facts importance specialist readers published as "Supporting Information"....
Nondispersive ambipolar carrier transport with comparably high electron and hole mobilities for amorphous molecular solids that are composed of only a single type chromophores was observed the first time in ter(9,9-diarylfluorene)s. High over 10-3 cm2/(V.s) can be achieved these terfluorenes. In particular, mobility represents highest ever reported solids.
We demonstrate a polymer-free method that can routinely transfer relatively large-area graphene to any substrate with advanced electrical properties and superior atomic chemical structures as compared the sheets transferred conventional polymer-assisted methods. The films are show high conductance excellent optical transmittance. Raman spectroscopy X-ray/ultraviolet photoelectron also confirm presence of quality little contamination after transfer. Atom-resolved images be obtained using...
In this letter, we investigate electronic structures and electron-injection mechanisms of the effective cathode for organic light-emitting devices incorporating cesium carbonate (Cs2CO3), either deposited as an individual thin injection layer or doped into electron-transport layers. The interface chemistry studied by ultraviolet x-ray photoemission spectroscopy show that enhanced electron is associated with strong n-doping effects increase concentrations in induced Cs2CO3. Since such a...
We in situ probed the surface band bending (SBB) by ultraviolet photoelectron spectroscopy (UPS) conjunction with field-effect transistor measurements on incompletely depleted ZnO nanowires (NWs). The diameter range of NWs is ca. 150-350 nm. Several treatments (i.e., heat and Au nanoparticle (NP) decoration) were conducted to assess impact oxygen adsorbates SBB. A 100 °C treatment leads decrease SBB 0.74 ± 0.15 eV 29.9 3.0 nm width, which attributed removal most adsorbed molecules from NW...
A series of group III metal chelates have been synthesized and characterized for the versatile application organic light-emitting diodes (OLEDs). These are based on 4-hydroxy-1,5-naphthyridine derivates as chelating ligands, they blue version analogues well-known green fluorophore Alq3 (tris(8-hydroxyquinolinato)aluminum). ligands their were easily prepared with an improved synthetic method, facially purified by a sublimation process, which enables materials to be readily available in bulk...
We demonstrate the nanoscale p-type Bi2Te3 powder-based saturable absorber-induced passive mode-locking of erbium-doped fiber laser (EDFL) with sub-picosecond pulsewidth. Such a topological insulator powder is obtained by polishing bulk in commercial thermoelectric cooler (TE cooler). This then directly brushed onto end-face single-mode patchcord, to avoid any mis-connecting loss caused beam divergence, which can result mode-locked pulsewidth 436 fs self-amplitude modulation mode TE cooler....
Abstract One of the key challenges in artificial photosynthesis is to design a photocatalyst that can bind and activate CO 2 molecule with smallest possible activation energy produce selective hydrocarbon products. In this contribution, combined experimental computational study on Ni‐nanocluster loaded black TiO (Ni/TiO 2[Vo] ) built‐in dual active sites for photocatalytic conversion reported. The findings reveal synergistic effects deliberately induced Ni nanoclusters oxygen vacancies...