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Organic light emitting diodes (OLEDs) are fabricated using two novel polymers, isotactic and syndiotactic poly(N-pentenyl-carbazole) (i-PPK and s-PPK), as emitting layers. The electroluminescence spectra of the devices are analyzed in comparison with the photoluminescence spectra of polymer films and are related to their microstructure properties. Blue light emitting diodes are obtained, except for...
Aluminium scandium nitride (ASN) exhibits a largely enhanced piezoelectric response as compared to aluminium nitride (AlN), which makes it an upcoming piezoelectric material for use in next generation RF filters, sensors, actuators and energy harvesting devices. In this work, process-microstructure-property relationships of such sputtered ASN films containing up to 42 at% Sc were investigated. Hereby,...
Improving the output of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) sensor has been the central issue to meet the requirements for next generation read sensors.
This paper presents a new method for making three-dimensional structure on the surface of an elastomer substrate. In general, micromachining based on lithography process is layer-by-layer fabrication, and the resulting structure is restricted to be two-dimensional. In this paper, we presented that three-dimensional structures were achieved by attaching a thin film partially onto an elastomer. Under...
The paper reports the improvement of tensile strength of single-crystal silicon (SCS) microstructures fully coated with sub-micrometer thick diamond like carbon (DLC) film using plasma enhanced chemical vapor deposition (PECVD). To minimize the deformations or damages caused by non-uniform coating of DLC, which has high residual stress, the released SCS specimens with the dimensions of 120 μm long,...
The development of a new generation of supercapacitors with high electric and energy characteristics based on new active ingredients is an important and useful task. One of the most promising materials for the realization of these objectives is granular nanocomposites made from pyrocarbon (PC) matrix and nanosized globular carbon. The paper presents the results of the study properties of pyrocarbon...
In order to limit the scattering of electron at grain boundaries (GBs) which contributes to the resistivity, it is necessary to reduce the number of GBs by increasing the grain size of Cu films. The grain growth evolution in nanotwinned Cu (nt-Cu) films prepared by electrodeposition is investigated in this study. For the purpose of understanding the nt-Cu grain growth occur on (100)-oriented Cu, a...
High light extraction efficiency is strongly required in many illumination applications. In this study, a new method to fabricate microstructure array based on porous film and silicone gel (OE-6550, Dow Corning, USA) molding process for the blue chip-on-board (COB) packaging light emitting diodes (LEDs) is proposed and demonstrated. In this method, the porous film on the polymer surface is a polystyrene(PS)...
We investigated microstructures and transport properties of Nb-doped anatase TiO2 (TNO) films deposited by two methods: sputtering and pulsed laser deposition (PLD).We found that working pressure (Pw) of sputtering has a significant influence on both microstructures and transport properties. Cross-sectional observation by transmission electron microscopy revealed that lowered Pw improved homogeneity...
Theoretical analyses on the thermo-mechanical behavior of power modules designed in a new buildup and interconnection technology based on silver sintering and electroplated copper interconnects have been made. The characteristic difference to other technologies can be seen in the replacement of bonding wires by planar copper interconnects and the high voltage applicability of the resulting modules...
Chromium aluminium nitride (CrAlN) thin films were grown on Si wafers by DC reactive magnetron co-sputtering technique without external heating and biasing to the substrates. The effect of N2 gas flow rate on the structure of the as-deposited films was invested. Cr and Al metals were used as sputtering targets. The Cr and Al sputtering current were fixed at 300 mA. The sputtering gas (Ar) flow rate...
This study has demonstrated the design and fabrication of wearable piezoelectric PDMS rubber microstructures with d31 and d33 modes. This PDMS microstructure shows a strong piezoelectricity with effective piezoelectric coefficient (d31) and (d33) of approximately 235 and 3350 pC/N, the lower effectively elastic modulus (E) and spring constant (k) are approximate 300 kPa and 250 N/m, respectively....
In this work, multiwalled carbon nanotubes are being investigated for mechanical reinforcement of metal contacts on inverted metamorphic multijunction solar cells. We have focused on a silver-carbon-nanotube layer-by-layer microstructure for our initial studies. The silver layer is electrodeposited, and the carbon nanotube layer is deposited by electrodeposition and nanospreading. To increase adhesion...
The defect scatter interval (St) of a-Si:H/c-Si interface and void concentration (Cv) of a-Si:H were analyzed by Spectroscopic Ellipsometry (SE). The passivation performance of a-Si:H layers in SHJ solar cells was not only affected by the conductivity, but more importantly, it was strongly governed by the hydrogen content (CH) in a-Si:H layers. In addition, the microstructure deduced from SE was in...
High magnetocrystalline anisotropy (Ku) material was required for future heat assisted magnetic recording media. The ordered L10 FePt film can be prepared to have high [001] texture which shows high perpendicular magnetic anisotropy. Epitaxial growth of FePt films on MoC/CrRu/glass have been proved to promote chemical ordering and texturing. Dual-segregants such as transition metal-oxide with carbon...
Resistive random access memory is one of the most promising non-volatile alternatives to current technologies, such as Flash, due to its simple sandwiched structure, low power consumption, high speed and good endurance1,2. In many cases, the mechanism of resistive switching is believed to be the formation and partial dissolution of nanoscale conductive filaments (CFs) during the set and reset process...
Magnetically soft nanogranular thin films comprised of metal grains separated by an insulating oxide matrix have emerged as an attractive candidate for high frequency inductor applications. The development of magnetic cores that can be integrated with current CMOS technology are critical to enable future power supplies on a chip (PwrSOC) that will lead to further miniaturization of electronic devices...
Co/Pt multilayers were one of the first thin film systems with perpendicular magnetic anisotropy (PMA) to be studied [1]. Originally attractive because of their potential as magneto-optic recording media, they are now of interest for the study of magnetic domain walls and spin torque. The physics of domain walls and their response to magnetic field and electric current underpins device concepts such...
In order to achieve the application of FePt based films, great progresses have been made in the fabrication of granular FePt thin films using MgO or TiN underlayer/intermediate layers. However, the MgO intermediate layer possessing small surface energy led to large opening-up in the in-plane hysteresis loop while the TiN intermediate layer possessing large surface energy caused the formation of the...
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