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Research Area

Research Area.  Photoresponsive & Conducting Organic Nanostructures  Organic-Based Hybrid Nanostructures  Organic Optoelectronics: OLED, Organic Transistor/Solar Cell/Sensor  Organic Photonics: Nanoscale Optical Waveguide, Surface Plasmon

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Research Area

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  1. Research Area  Photoresponsive& Conducting Organic Nanostructures  Organic-Based Hybrid Nanostructures  Organic Optoelectronics: OLED, Organic Transistor/Solar Cell/Sensor  Organic Photonics: Nanoscale Optical Waveguide, Surface Plasmon  Electromagnetic Interference Shielding

  2. Materials  -Conjugated Polymers (Conducting Polymers): From insulating state to (semi)conducting state  -Conjugated Molecules Alq3 rubrene pentacene perylene  Graphene

  3. Control tube or wire Diameter : 50 nm ~ 200 nm Length : up to 40 μm Conducting Polymer Nanotubes/Nanowires PEDOT Nanotube Nanoislands PPy Nanotube P3MT Nanotube PT Nanotube

  4. Application Study for Conducting Polymer Nanotubes/Nanowires  NanotipEmitter of Field Emission Display (FED)  Single Strand Organic Transistor Source Gate Drain Transistor pattern Si3N4 or SiO2 Polypyrrole Nanotube or Nanowire Sample D (Au) S (Au) Insulator (Si3N4, SiO2) G (Au) Nanotip Emitter 3 ㎛ thickness ~ 2000Å

  5. n S Organic-Inorganic, Organic-Organic Hybrid Nanostructure  Bright Light Emission of PTh/metals Hybrid NTs •  Charge Transfer Effect in SPR coupling • by using Doped-Polymer/Metal Hybrid NTs Simultaneous measurement PTh Cu PTh PTh/Cu 100 nm PTh/Cu PTh UV/Vis absorption spectra Cu ■ Doped-P3MT(0.67) NTs ●Doped-P3MT(0.52) NTs ▲Doped-P3MT(0.25) NTs ▼Doped-P3MT(0.04) NTs Diameter : ~ 200 nm Length : 40 m Wall thickness : 10 nm Cu 5 nm 100 nm • LCM PL intensity decreased with increasing doping level of P3MT NTs • LCM PL intensity increased with increasing doping level of P3MT/Ni HDLNTs • LCM PL intensity increased up to ~350 times • Enhancement of PL intensity(~100 times) through nanoscale metal coating on PTh NT due to surface plasmon resonance Ref.) J. Joo, D. H. Park et al., Adv. Mater. 19, 2824 (2007) Ref.) D. H. Park, J. Joo, et al., Adv. Func. Mater. 18, p.2526 (2008).

  6. Organic-Inorganic, Organic-Organic Hybrid Nanostructure  Light-Emitting MEH-PPV and MEH-PPV/Au Hybrid NPs  Light-Emitting Color Barcode NWs (LECB-NWs) Reprecipitation Method • Alternating Electrochemical Polymerization Method • (P3BT-PEDOT NW compartments) • 22 NW compartments LCM PL spectra Au NPs Color CCD Au λex = 488 nm Au Au Au S S S Au Au MEH-PPV/Au single NP Au S S Au Au S S Au S Au MEH-PPV NP MEH-PPV single NP SEM Au Au Au Color CCD images LCM PL images LCM PL P3BT PEDOT MEH-PPV NPs MEH-PPV/Au NPs Ref.) M. S. Kim, J. Jooet al. ACS Nano 3, 1329(2009) Ref) D. H. Park, J. Joo, et al., ACS Nano,.4, 5155 (2010).

  7. Organic Electronics : OLED  Conventional OLED  OLED using Nanomaterial Thin Film Deposition P3MT nanotubes : Lighting

  8. Flexible OTFT Source Drain Gate 0V 18V 21V 23V 35V Organic Electronics : Organic Transistors  Flexible and all-polymer based OTFT  Conventional Organic Thin Film Transistor (OTFT)

  9. Organic Optoelectronics : Photo responsive Organic FETs  Highly photo-sensitive OTFT  Memory operation with gate-field and light hν Erase Write 4(HPBT)-benzene 4(HP3T)-benzene Iph/Idark = 4×103 ① ② ③ ④ Read (off) Read (on) D (Au) S (Au) On state TIPS-pentacene Active layer Insulator (SiO2) Gate (doped Si wafer) Off state • High reproducibility and retention ability (>1h) Photo-sensitivity (A/W) ΔId(≡ Id,ph−Id,dark ) /Pinc Memory operation processes: [writing-reading(on-state)-erasing-reading(off-state)]

  10. Solar Cells • OPVCs using organic NPs enhancement of Light absorption Al electrode Organic NPs P3HT:PCBM PEDOT:PSS insulator ITO glass h • I-V characteristics and power conversion efficiency(PCE) curves • Control of PCE using diverse organic NPs

  11. Focused Electron-Beam Treatment  Schematic diagram of focused E-beam treatment  Focused E-beam treated TiO2 NW 1.01018 1018 Color CCD images (ex = 405 nm) Focused E-beam Generator V    E-beam source 5.01017  7.5 m    1017    1st Condenser lens  5.01018  5.0 m    Aperture Length = 2.0 m Distance = 1.5 m 7.5 m 2nd Condenser lens Stigmator / Deflection coil 3-D LCM PL images (ex = 405 nm) 189 315 5.01017  Focused E-Beam (  ~ 100 nm)  1017  1018 99 7.5 m Pre-patterned Si wafer 5 m 10 m Focused E-beam treated organic/inorganic nanomaterials  5 m 5.01018

  12. Focused E-beam treated P3MT NW 7.51016 electrons/cm2 I-V characteristic curves of P3MT single NW 2.51017 electrons/cm2 C O L O R C C D I M A G E   Length : 0.25, 0.5, 1, 2 3, 4, 5, 6 m Length = 1 m             Length : 0.5, 1, 2, 3, 4, 5 m • pristine Length = 2 m • single 5 m Au Au 100 nm • triple 3 D L C M P L I M A G E 130.5 1066.6 1.25 m Single junction P3MT NW  Multi junction in the middle of NW (width/dosage = 100 nm/1.01017 electrons/cm2) Control of electrical properties 15 m 10 m 10 m 10 m

  13. PMMA 1 m MWCNT MWCNT Composite for EMI Shielding PDP mesh filter for EMI Shielding Electromagnetic Interference Shielding  EMI SE Measurement System EMI Shielding using Conducting Polymer

  14. Characterization •  Electrical Properties: • Temperature Dependent DC Conductivity (RTg10K) • Temperature Dependent AC Conductivity and Dielectric (RTg78K) • Microwave Conductivity and Dielectric Constant • I-V characteristics (with/without gate) • Photoresponsive I-V characteristics •  Magnetic Properties: • EPR • SQUID • Magnetoresistance  Optical Properties: • FT-IR Spectrum • UV/Vis/NIR Spectrum • Photo Luminescence • Laser Confocal Microscope  Structural Properties • XRD • XPS • SEM, TEM

  15. Research Equipment (1)  DC Measurement System  AC Measurement System • Temp. : 10 K ~ 350 K • DC Characteristics • I-V for Electronic Device • Temp. : 70 K ~ 450 K • Freq. : 10 Hz ~ 2 MHz • AC Characteristics

  16. Research Equipment (2)  Deposition Systems  EMI SE Measurement System Organic Molecular Beam Deposition Thermal Evaporator

  17. Research Equipment (3)  Accessories Picoammeter and Sensitive Voltmeter Ball Bonder High Resolution Optical Microscope

  18. Research Equipment (4)  LCM PL Measurement  Glove Box

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