• Title/Summary/Keyword: PEDOT(PEDOT)

Search Result 351, Processing Time 0.032 seconds

Fabrication of Single Crystal Poly(3,4-ethylenedioxythiophene) Nanowire Arrays

  • Cho, Bo-Ram;Sung, Myung-M.
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2012.02a
    • /
    • pp.537-537
    • /
    • 2012
  • We have studied a fabrication of vapor phase polymerized Poly(3,4-ethylenedioxythiophene) (PEDOT) nanowire arrays for the first time. The vapor-phase polymerization (VPP) technique is a bottom-up processing method that utilizes the organic arrangement of macromolecules to easily produce ordered aggregates, including on the nanoscale, or prepare thin films of self-assembled molecules, micropatterns, or modified microstructures of pure conducting polymers. Also, liquid-bridge-mediated nanotransfer molding (LB-nTM), which was reported as a new direct patterning method recently, is for the arrayed formation of two- or three-dimensional structures with feature sizes as small as tens of nanometers over large areas up to 4 inches across and is based on the direct transfer of various materials from a mould to a substrate through a liquid bridge between them. The PEDOT nanowires grown by VPP method and transferred on a substrate to use LB-nTM method have been fabricated to single crystal PEDOT nanowires investigated Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Selected Area Electron Diffraction (SAED), X-Ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), and electrical properties.

  • PDF

High performance OTFT using PEDOT:PSS on plastic substrate by inkjet printing

  • Lee, Myung-Won;Choi, Jae-Chul;Park, Jong-Seung;Song, Chung-Kun
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2009.10a
    • /
    • pp.874-876
    • /
    • 2009
  • This is a report on fabrication and electrical characteristics of pentacene OTFT that uses conducting PEDOT/PSS as source drain electrodes. We demonstrate enhanced conductivity of PEDOT/PSS film with glycerol and optimize properties for ink jet printing. We also present the application of oxygen plasma technique in order to favor selective spreading for subsequent inkjet printing.

  • PDF

Characteristics of Hybrid-type Transparent Electrodes Fabricated by Coating Carbon Nanotubes with Conductive Polymers (탄소나노튜브 위에 전도성 고분자가 코팅된 하이브리드형 투명전극의 특성)

  • Park, Jin-Seok;Park, Jong-Seol;Kim, Bu-Jong
    • Journal of the Semiconductor & Display Technology
    • /
    • v.18 no.3
    • /
    • pp.36-41
    • /
    • 2019
  • Hybrid-type transparent electrodes were fabricated by depositing carbon nanotubes (CNTs) via spray coating on polyethylene terephthalate (PET) substrates and then coating the CNTs with [poly(3,4-ethylenedioxythiophene)] (PEDOT) films via electro-polymerization. For all of the fabricated electrodes, their surface morphologies, electric sheet resistances, visible transmittances, and color properties (e.g., yellowness) were characterized as functions of the applied voltages and process times used in electro-polymerization. The sheet resistance of the CNTs was significantly reduced by the coating of PEDOT, while their visible transmittances slightly decreased. The yellowness values of the PEDOT-coated CNTs were observed to have substantially decreased via electro-polymerization. The experimental results confirmed that the fabricated hybrid electrodes had desirable properties for the application of transparent electrode in terms of the electrical resistance, optical transmittance, and chromaticity.

정공주입층 삽입에 따른 적색 고분자 유기발광소자의 발광효율 변화

  • Yu, Byeong-Su;Jeon, Yeong-Pyo;Kim, Tae-Hwan
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2013.02a
    • /
    • pp.505-505
    • /
    • 2013
  • 유기발광소자는 저전력, 고휘도 및 빠른 응답속도와 넓은 시야각 등의 장점을 가지고 있어 소형 디스플레이 및 대형 디스플레이로 상용화하기 위해 많은 연구가 진행되고 있다. 고분자 유기발광소자는 저분자 유기발광소자에 비하여 용액공정을 사용하여 저비용으로 대면적 디스플레이를 제작하기 유리하기 때문에 많은 연구가 되고 있다. 하지만, 고분자 유기발광 소자는 구동 전압이 높고 발광효율이 낮은 단점을 가지고 있다. 본 연구에서는 고분자 유기발광 소자의 구동전압 감소와 발광효율을 증가 시키기 위해 정공주입층을 가진 적색 고분자 유기발광소자를 제작하였다. 정공주입층을 포함하는 고분자 유기발광소자는 Indium thin oxide (ITO)위에 정공주입층 형성 후 스핀코팅 방법으로 poly (3,4-ethylenedioxythiopene): poly (styrenesulfonate) (PEDOT: PSS)을 정공수송층으로, poly (2-methoxy-5-(2-ethylhexoxy)-1,4-phenylence vinylene) (MEH-PPV)를 발광층으로 적층하고, Al을 음극 전극으로 진공 증착하여 소자를 제작하였다. 정공주입층의 특성 분석을 위해 정공주입층의 투과도와 ITO/PEDOT:PSS와 ITO/정공주입층/PEDOT:PSS의 표면을 원자힘 현미경으로 측정하였다. 정공주입층의 가시광선 영역 투과도는 90% 이상으로 높게 나왔으며, ITO/정공주입층/PEDOT:PSS의 경우 ITO/PEDOT:PSS 보다 표면 거칠기가 감소하였다. 높은 가시광선 영역 투과도와 낮은 표면 거칠기는 발광층으로 정공주입을 원활하게 하여 소자의 발광 효율이 증가한다. 정공주입층을 포함하는 적색 고분자 유기발광소자의 경우 전류밀도-전압, 휘도-전압의 관계에서 정공주입층을 사용하지 않은 소자에 비하여 높은 전기적 및 광학적 특성이 나타났다.

  • PDF

The Properties of Polymer Light Emitting Diodes with ITO/PEDOT:PSS/MEH-PPV/Al Structure (ITO/PEDOT:PSS/MEH-PPV/Al 구조의 고분자 유기발광다이오드의 특성 연구)

  • Gong, Su-Cheol;Chang, Ho-Jung
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.12 no.3 s.36
    • /
    • pp.213-217
    • /
    • 2005
  • The polymer light emitting diodes (PLED) with ITO/PEDOT:PSS/MEH-PPV/Al structure were prepared on ITO(indium tin oxide)/Glass substrates using PEDOT:PSS[poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)] as the hole transport material and MEH-PPV[poly(2-methoxy-5-(2-ethyhexoxy)-1,4phenylenvinylene)] as emission material layer. The dependences on the surface roughnees and friction coefficient between film layers were investigated as a function of the MEH-PPV concentrations$(0.1\;wt\%\~0.9\;wt\%)$. The RMS values decreased from 1.72 nm to 1.00 nm as the concentration of MEH-PPV increased from $0.1\;wt\%\;to\;0.9\;wt\%$, indicating improvement of surface roughness. In addition, friction coefficients decreased from 0.048 to 0.035, which means the deteriorating of the adhesion condition. The PLED sample with $0.5\;wt\%$ of MEH-PPV showed the maximum luminance of $409\;cd/m^2$.

  • PDF

PEDOT:PSS Enhanced Electrochemical Capacitive Performance of Graphene-Templated δ-MnO2

  • Sinan, Neriman;Unur, Ece
    • Journal of Electrochemical Science and Technology
    • /
    • v.11 no.1
    • /
    • pp.50-59
    • /
    • 2020
  • Birnessite-type manganese dioxide (δ-MnO2) with hierarchical micro-/mesoporosity was synthesized via sacrificial graphene template approach under mild hydrothermal conditions for the first time. Graphene template was obtained by a surfactant (cetyltrimethylammonium bromide, CTAB) assisted liquid phase exfoliation (LPE) in water. A thin PEDOT:PSS (poly (3,4-ethylene dioxythiophene): poly (styrene sulfonate)) layer was applied to improve electrical conductivity and rate capability of MnO2. The MnO2 (535 F g-1 at 1 A g-1 and 45 F g-1 at 10 A g-1) and MnO2/PEDOT:PSS nanocomposite (550 F g-1 at 1 A g-1 and 141 F g-1 at 10 A g-1) delivered electrochemical performances superior to their previously reported counterparts. An asymmetric supercapacitor, composed of MnO2/PEDOT:PSS (positive) and Fe3O4/Carbon (negative) electrodes, provided a maximum specific energy of 18 Wh kg-1 and a maximum specific power of 4.5 kW kg-1 (ΔV= 2 V, 1M Na2SO4) with 85% capacitance retention after 1000 cycles. The graphene-templated MnO2/PEDOT:PSS nanocomposite obtained by a simple and green approach promises for future energy storage applications with its remarkable capacitance, rate performance and cycling stability

Evaluation of Output Performance of Flexible Thermoelectric Energy Harvester Made of Organic-Inorganic Thermoelectric Films Based on PEDOT:PSS and PVDF Matrix (PEDOT:PSS 및 PVDF 기반의 유-무기 열전 필름으로 제작된 플렉서블 열전 에너지 하베스터의 발전 성능 평가)

  • Yujin Na;Kwi-Il Park
    • Korean Journal of Materials Research
    • /
    • v.33 no.7
    • /
    • pp.295-301
    • /
    • 2023
  • Thermoelectric (TE) energy harvesting, which converts available thermal resources into electrical energy, is attracting significant attention, as it facilitates wireless and self-powered electronics. Recently, as demand for portable/wearable electronic devices and sensors increases, organic-inorganic TE films with polymeric matrix are being studied to realize flexible thermoelectric energy harvesters (f-TEHs). Here, we developed flexible organic-inorganic TE films with p-type Bi0.5Sb1.5Te3 powder and polymeric matrices such as poly(3,4-eethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and poly (vinylidene fluoride) (PVDF). The fabricated TE films with a PEDOT:PSS matrix and 1 wt% of multi-walled carbon nanotube (MWCNT) exhibited a power factor value of 3.96 µW·m-1·K-2 which is about 2.8 times higher than that of PVDF-based TE film. We also fabricated f-TEHs using both types of TE films and investigated the TE output performance. The f-TEH made of PEDOT:PSS-based TE films harvested the maximum load voltage of 3.4 mV, with a load current of 17.4 µA, and output power of 15.7 nW at a temperature difference of 25 K, whereas the f-TEH with PVDF-based TE films generated values of 0.6 mV, 3.3 µA, and 0.54 nW. This study will broaden the fields of the research on methods to improve TE efficiency and the development of flexible organic-inorganic TE films and f-TEH.

Enhanced Efficiency of Organic Electroluminescence Diode Using PEDOT-PSS/NPD-$C_{60}$ Hole Injection/Transport Layers (PEDOT-PSS/NPD-$C_{60}$ 정공 주입/수송 층이 도입된 유기발광소자의 성능 향상 연구)

  • Park, Kyeong-Nam;Kang, Hak-Su;Senthilkumar, Natarajan;Park, Dae-Won;Choe, Young-Son
    • Polymer(Korea)
    • /
    • v.33 no.5
    • /
    • pp.407-412
    • /
    • 2009
  • Vacuum deposited N,N-di-1-naphthyl-N,N-diphenyl-1,1'-biphenyl-4,4'-diamine (NPD) as a hole transporting (HTL) materials in OLEDs was placed on PEDOT-PSS, a hole injection layer (HIL). PEDOT-PSS was spin-coated on to the ITO glass. $C_{60}$-doped NPD-$C_{60}$(10 wt%) film was formed via co-evaporation process and the morphology of NPD-$C_{60}$ films was investigated using XRD and AFM. The J - V, L - V and current efficiency of multi -layered devices were characterized. According to XRD results, the deposited $C_{60}$ thin film was partially crystalline, but NPD-$C_{60}$ film was observed not to be crystalline, which indicates that $C_{60}$ molecules are uniformly dispersed in the NPD film. By using $C_{60}$-doped NPD-$C_{60}$ film as a HTL, the current density and luminance of multi-layered ITO/PEDOT-PSS/NPD-$C_{60}/Alq_3$/LiF/Al device were significantly increased by about 80% and its efficiency was improved by about 25% in this study.

Liquid Crystal Driving of Transparent Electrode-Alignment Layer Multifunctional Thin Film by Nano-Wrinkle Imprinting of PEDOT:PSS/MWNT Nanocomposite (PEDOT:PSS/MWNT 나노복합체의 나노주름 임프린팅을 통한 투명전극-배향막 복합 기능 박막의 액정 구동)

  • Jong In Jang;Hae-Chang Jeong
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
    • /
    • v.16 no.1
    • /
    • pp.8-17
    • /
    • 2023
  • In conventional liquid crystal display(LCD) manufacturing process, Indium Tin Oxide(ITO) as transparent electrode and rubbing process of polyimide as alignment layer are essential process to apply electric field and align liquid crystal molecules. However, there are some limits that deposition of ITO requires high vacuum state, and rubbing process might damage the device with tribolectric discharge. In this paper, we made nanocomposite with PEDOT:PSS and MWNT to replace ITO and constructed alignment layer by nano imprint lithography with nano wrinkle pattern, to replace rubbing process. These replacement made that only one PEDOT:PSS/MWNT film can function as two layers of ITO and polyimide alignment layer, which means simplification of process. Transferred nano wrinkle patterns functioned well as alignment layer, and we found out lowered threshold voltage and shortened response time as MWNT content increase, which is related to increment of electric conductivity of the film. Through this study, it may able to contribute to process simplification, reducing process cost, and suggesting a solution to disadvantage of rubbing process.