Plasmon-active silver nanoparticle layers were included in solution-processed bulk-heterojunction solar cells. Nanoparticle fabricated using vapor-phase deposition on indium tin oxide electrodes. Owing to the increase optical electrical field inside photoactive layer, inclusion of such particle films lead increased absorption and consequently photoconversion at solar-conversion relevant wavelengths. The resulting energy conversion efficiency for a bulk heterojunction photovoltaic device...

The oxides of copper (Cu_xO) are fascinating materials due to their remarkable optical, electrical, thermal and magnetic properties.

We have used airbrush spray deposition to fabricate organic photovoltaic devices with an active layer composed of a blend poly(3-hexylthiophene) and [6,6]-phenyl-C61 butyric acid methyl ester. Working were prepared in ambient conditions from variety common solvents; layers chlorobenzene exhibit improved homogeneity, resulting narrower distributions the relevant device parameters. Further studies on showed that annealing at 120°C for 10min resulted optimum performance, thickness 150nm maximum...

Room temperature single-photon emission and quantum characterization is reported for isolated defects in zinc oxide. The are observed thin films of both in-house synthesized commercial oxide nanoparticles. Emission spectra the red infrared, second-order photon correlation functions, lifetime measurements, count rates presented. Both two- three-state emitters identified. Sub-band gap absorption suggest these vacancy. These results identify a new source single photons readily available wide...

Random silver nanohole films were created through colloidal lithography techniques and metal vapor deposition. The transparent electrodes characterized by uv-visible spectroscopy incorporated into an organic solar cell. test cells evaluated for power-conversion efficiency incident photon-to-current conversion efficiency. spectra displayed evidence that a film with 92nm diameter holes induces surface-plasmon-enhanced photoconversion. demonstrate promising route to removing the indium tin...

Using ZnO seed layers, an efficient approach for enhancing the heterointerface quality of electrodeposited ZnO–Cu2O solar cells is devised. We introduce a sputtered layer followed by sequential electrodeposition and Cu2O films. The employed to control growth crystallinity augment surface area films, thereby tuning heterointerface. Additionally, also assists in forming high with no pin-holes, pH electrolyte solution. X-ray electron diffraction patterns, scanning atomic force microscopy...

Abstract The charge‐collection dynamics in poly(3‐hexylthiophene:[6,6]‐phenyl‐C 61 ‐butyric acid methyl ester (P3HT:PCBM) bulk heterojunctions are studied thick (>1 μm) devices using time‐of‐flight measurements and external quantum‐efficiency measurements. show Schottky‐diode behavior with a large field‐free region the device. Consequently, electron transport occurs by diffusion of active layer. At high applied biases where depletion spans entire layer, normal transients observed from...

Anisotropic deformation of polystyrene particles in an oxygenated (O2/Ar) plasma is observed for radio frequency (rf) and inductively coupled (ICP). A facile model based on a ratio completely isotropic anisotropic etching presented to describe the anisotropy process implemented determine height spheroid-shaped particles. In our systems, we find be 54% rf 79% ICP. With this model, maximum material deposition thickness nanofabrication with plasma-etched nanosphere lithography or colloid can...

The use of biocompatible and biodegradable materials in optoelectronics will enable the development promising applications field healthcare environmental sensors as well a more sustainable production technology. Here, we present light-emitting electrochemical cells which utilize polymer poly(lactic-co-glycolic acid) (PLGA) to promote ionic conductivity active layer cells. device performance was analyzed terms volume fraction PLGA blend with respect three different lactic:glycolic monomer...

2D arrays of Au–PNIPAM core–shell nanocrystals were fabricated using convective deposition and spin-coating. The particle density ordering studied by AFM. Annealing at 700 °C removes the polymer shell, while retaining a monolayer well-separated gold nanoparticles. surface plasmon modes colloid monolayers could be measured spectroscopic ellipsometry.

Finding new solid state defect centers in novel host materials is crucial for realizing integrated hybrid quantum photonic devices. We present a preparation method with photostable bright single photon emission zinc oxide, material promising properties terms of processability, availability, and applications. A detailed optical study reveals complex dynamic intensity fluctuations at room temperature. Measurements cryogenic temperatures show very sharp (<60 GHz) zero phonon lines (ZPLs) 580 nm...

Abstract In this work, we demonstrate the use of biodegradable polymer polycaprolactone (PCL) as ion solvating in solution-processed light-emitting electrochemical cells (LEC). We show that inclusion PCL active layer yields higher ionic conductivities and thus contributes to a rapid formation dynamic p-i-n junction reduction operating voltages. shows no phase separation with emitter reduces film roughness. The devices light-emission at voltages low 3.2 V lifetimes on order 30 h above 150 cd...

Energy transfer from the defect state of zinc oxide nanoparticles to fluorescent dye AlexaFluor 594 (A594) cadaverine has been studied using both steady-state and time-resolved photoluminescence (PL) measurements. The addition five stoichiometric equivalents A594 completely quenches visible emission nano crystals. We also find that entire ZnO is reduced without any change in overall line shape emission, demonstrating a single electronic coupled phonon modes crystal lattice. energy modeled...

Atomic force microscopy, contact-angle, and spectroscopic ellipsometry measurements were employed to investigate the presence properties of gold oxide on surface metal. It was found that, in agreement with available literature, unoxidized surfaces hydrophobic, whereas oxidation rendered highly hydrophilic. The could be removed ethanol or base but appeared stable over long periods water salt solutions between pH 3 7. After oxidation, layer thickness, determined using ellipsometry, consistent...

We show that perforated metal electrode arrays, fabricated using nanosphere lithography, provide a viable alternative to conductive oxides as transparent materials. The inter-aperture spacing is tuned by varying etching times in an oxygen plasma, and the effect of “wire” thickness on optical electronic properties silver films shown. Optical transmission limited reflection surface plasmons, for these results do not exceed 73%. Electrical sheet resistance shown be low 3 Ω ◻−1 thermally...

Abstract We describe a comprehensive model for the optical properties of pristine films poly‐(3‐hexylthiophene) (P3HT). The presented is anisotropic with axis normal to substrate plane, which consistent previous x‐ray diffraction studies that show preferential edge‐on packing polymer chains on substrate. Peak locations and spacings are defined using Huang‐Rhys vibronic progression known phonon energies. demonstrate fits variable‐angle spectroscopic ellipsometry normal‐incidence transmission...

The effects of ZnO crystal defects and the ubiquitous defect fluorescence on electronic properties nanocrystal thin-films were determined. Films prepared from particles in DMSO with controllable fluorescence. Particles determined to range size 5 12 nm average, little bearing properties. Thin-film electron mobilities found decrease 0.04 cm2 V−1 s−1 0.008 decreasing fluorescence, indicating are pivotal high-mobility nanoparticle films. threshold voltage FET devices was 120 40 V while...

Digital printing enables solution processing of functional materials and opens a new route to fabricate low-cost electronic devices. One crucial parameter that affects the wettability inks for all techniques is surface free energy (SFE) substrate. Siloxanes, with their huge variety side chains ability form self-assembled monolayers, offer exhaustive control substrate SFE from hydrophilic hydrophobic. Thus, siloxane treatment suitable approach adjust conditions desired ink, instead optimizing...

Zinc oxide nanocrystals were prepared in ethanol and spin-cast to form semiconductor nanocrystal thin films that thermally annealed at temperatures between 100 800 °C. Particle size, monodispersity, film porosity determined by X-ray diffraction, ultraviolet−visible absorption spectroscopy, spectroscopic ellipsometry, respectively. Film rapidly decreased above 400 °C, from 32% 26%, which coincided with a change electronic properties. Above the ZnO electron mobility, FET transfer...

We demonstrate the fabrication of sophisticated nanostructures using nanosphere lithography (NSL). These include periodic triangular and pyramidal islands as well periodically perforated thin films cavities on nano- microscale. Furthermore, arrays vertically standing multiwalled carbon nanotubes are grown by plasma enhanced chemical vapor deposition from catalyst that were prepatterned NSL. Moreover, we discuss applicability NSL to rough surfaces show ratio between size roughness is...