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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Vardeny, Zeev Valentine | Efficiency enhancement of an organic light-emitting diode with a cathode forming two-dimensional periodic hole array | We fabricated an organic light-emitting diode using a ∏-conjugated polymer emissive layer sandwiched between two semitransparent electrodes: an optically thin gold film anode, whereas the cathode was in the form of an optically thick aluminum (Al) film with patterned periodic subwavelength two-dim... | pi-conjugated polymers; Organic light-emitting diode; OLED | 2005 |
| 2 |
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Vardeny, Zeev Valentine | Electroabsorption spectroscopy of single walled nanotubes | We have measured the electric field modulated absorption of a sample of single-walled nanotubes (SWNT) suspended in a solid polyvinyl alcohol matrix. The electroabsorption (EA) spectrum roughly follows the first derivative of the absorption with respect to photon energy, scales quadratically with t... | Electroabsorption spectroscopy; Single-walled nanotubes; SWNT | 2005 |
| 3 |
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Vardeny, Zeev Valentine | Infrared ultrafast optical probes of photoexcitations in ∏-conjugated organic semiconductors | We measured the ultrafast dynamics of photoexcitations in a variety of semiconductor ∏-conjugated polymer films and solutions, in the spectral range from 0.13 eV to 1.05 eV and time domain from 100 fs to 800 ps. The measurements were made in the low signal regime, where the relative changes in tra... | Infrared ultrafast optical probes; Photoexcitations; Ultrafast dynamics; MEH-PPV | 2005 |
| 4 |
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Vardeny, Zeev Valentine | Linear and nonlinear optical spectroscopies of PPV/PPE copolymer semiconductors | We used a variety of picosecond transient and cw spectroscopies to investigate the linear and nonlinear optical properties of films of PPE/PPV copolymer semiconductor. The spectroscopies used include absorption, electroabsorption (EA) and two-photon-absorption (TPA). In addition to the odd parity e... | Linear optical spectroscopy; Nonlinear optical spectroscopy; PPV/PPE copolymer; pi-conjugated polymers | 2005 |
| 5 |
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Vardeny, Zeev Valentine; Efros, Alexei L. | Optical studies of 2D and 3D metallo-dielectric photonic crystals | We have fabricated and studied two-dimensional (2D) and three-dimensional (3D) metallo-dielectric photonic crystals (MDPC) in the visible/near ir spectral range using a variety of optical techniques. The 2D MDPC showed anomalous transmission due to surface plasmon polaritons in resonance with the ph... | Metallo-dielectric photonic crystals; Organic light emitting diodes; Anomalous transmission; surface plasmon polaritons; Opal photonic crystals; Metal infiltrated opals; Optical reflectivity; Transmission spectra | 2005 |
| 6 |
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Vardeny, Zeev Valentine | Optical studies of spin coherence in organic semiconductors | Spin coherence in organic oligomer and polymer semiconductors is a crucial property in determining the performance of organic spin devices. Using the techniques of photo-induced absorption (PA) detected magnetic resonance (PADMR) and photoluminescence (PL) detected magnetic resonance (PLDMR), we ha... | Spin coherence; Organic spin devices | 2005 |
| 7 |
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Vardeny, Zeev Valentine | Organic spin-valves: physics and applications | Spin-valve devices of organic semiconductors in the vertical configuration using a variety of exotic and regular ferromagnetic electrodes were fabricated and studied as a function of applied magnetic field, temperature and applied bias voltage. These devices show that spin polarized carriers can be ... | Organic spin-valves; Spin-polarized transport; Spin-polarized carrier injection; Spin polarization | 2005 |
| 8 |
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Bromley, Benjamin C. | Periodic standing-wave approximation: nonlinear scalar fields, adapted corrdinates, and the eigenspectral method | The periodic standing wave (PSW) method for the binary inspiral of black holes and neutron stars computes exact numerical solutions for periodic standing-wave spacetimes and then extracts approximate solutions of the physical problem, with outgoing waves. The method requires solution of a boundary-... | Periodic standing wave method; Black holes; Neutron stars | 2005 |
| 9 |
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Boehme, Christoph; Friedrich, Frances | Pulsed EDMR study of charge trapping at Pb centers | Low temperature pulsed electrically detected magnetic resonance (pEDMR) measurements of charge trapping and recombination transitions involving Pb centers at the c-Si (111) /Si02 interface are presented. The results of these experiments show that when a conduction electron is trapped, it forms a str... | Charge trapping; Lande factor | 2005 |
| 10 |
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Williams, Clayton C. | Single-electron manipulation to and from a SiO2 surface by electrostatic force microscopy | Occupation of individual electron states near the surface of a SiO2 film is controlled by reversible single-electron tunneling to or from a metallic electrostatic force microscope probe. By switching the polarity of an applied dc bias between the probe and the sample to adjust the Fermi energy of ... | 2005 | |
| 11 |
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Vardeny, Zeev Valentine | Spin and magnetic field effects in organic semiconductor devices | The authors describe three spin and magnetic field effects in organic semiconductor devices: First, injection, transport and detection of spin-polarised carriers using an organic semiconductor as the spacer layer in a spin-valve structure, yielding low-temperature giant magnetoresistance effects as... | Spin effects; Magnetic field effects; MR; OLED; Organic light-emitting diode; Spin-polarised carriers; Spin-dependent exciton formation; Electroluminescent efficiency; pi-conjugated organic semicondutors; OSEC | 2005 |
| 12 |
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Vardeny, Zeev Valentine | Transport studies of isolated molecular wires in self-assembled monolayer devices | We have fabricated a variety of isolated molecule diodes based on self-assembled monolayers (SAM) of solid-state mixture (SSM) of molecular wires [1,4-methane benzene dithiol (Me-BDT)], and molecular insulator spacers [penthane 1-thiol (PT)] with different concentration ratios r of wires/spacers, wh... | Transport studies; Molecular wires; Monolayer devices | 2005 |
| 13 |
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Boehme, Christoph | Triplet recombination at Pb centers and its implications for capture cross sections | Pulsed electrically detected magnetic resonance measurements are presented showing that Pb centers at the crystalline silicon (c-Sid) (111) to silicon dioxide sSiO2d interface can cause recombination of strongly coupled spin pairs in singlet and triplet configurations. The implication of these find... | Silicon interfaces | 2005 |
| 14 |
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Vardeny, Zeev Valentine | Ultrafast spectroscopy of excitons in semiconducting carbon nanotubes | Ultrafast relaxation dynamics of photoexcitations in semiconducting single walled carbon nanotubes (S-NTs) were investigated using polarized pump-probe photomodulation (with 150 fs time resolution) and cw polarized photoluminescence (PL). Both annealed and unannealed NT films and D 2 0 solutions of ... | Non-linear optical methods; Carbon nanotubes; ultrafast dynamics | 2005 |
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