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Titanium dioxide powders were obtained by the homogeneous precipitation technique by using two different titanium precursors, namely, titanium (IV) butoxide and titanium (IV) isopropoxide. The solution was prepared by mixing the Ti precursors in methanol, after that, acetic and sulfuric acid were slowly added. The solution was kept under constant magnetic stirring until obtaining a white precipitate...
We report on the monolithic integration of RGB InGaN dot-in-a-wire LEDs on a single chip. The correlated color temperature can be continuously varied in the range of 1900K to 6800K, while maintaining excellent color rendering index capability (CRI>90). Moreover, submicron scale RGB pixels were demonstrated.
Flexible ITO-lree P3HT:PC61BM solar cells with spin-coated silver nanowire transparent electrode are demonstrated. For conventional structure type of solar cells, the power conversion efficiency (PCE) of devices based on silver nanowire can reach around 2.29%. As for inverted structure type, the PCE of devices can reach 3.39%. The conventional and inverted flexible ITO based P3HT:PC61BM solar cells...
This work demonstrates the trench P/N hybrid nanowires (NWs) channel junctionless thin film transistors (JL-TFT) with gate-all-around (GAA) structure. The GAA NWs hybrid JL-TFT exhibits the good electrical properties, including high ON/OFF current ratio (>106), subthreshold slope (136 mV/dec.), and low DILB (60 mV/V). This trench hybrid P/N channel JL-TFT is simple to fabricate and highly favorable...
In the past few years, organic film prepared on the silicon (Si) surface has become attractive owing to the wide range of potential application, low cost and good performance. In this paper, perfluorinated organic film was prepared on the Si surface in aqueous solution using one-step dipping method. On the Si surface, 4-nitrobenzene diazonium (NBD) tetrafluoroborate was firstly reduced with the presence...
In this study, the influence of adding Sn-0.7Cu, Sn-1.2Cu, Sn-3.0Ag-0.5Cu and Sn-4.0Ag-0.5Cu coating into Sn-58Bi/Cu interface was investigated during thermal aging by scanning electron microscopy with Energy Dispersive X-ray. And the coatings of the Sn-based solder on the Cu were made by using hot-dip method. The result showed the Sn-based coating on the Cu was effective at suppressing the IMCs'...
The wettability of the solders Zn-25Sn-XAl (x=0–0.09wt%) was investigated by dipping method. The interfaces between solders and Cu substrate were investigated by scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and energy dispersive spectroscopy (EDS) equipped in transmission elctron microscopy (TEM). It was found that the addtion of Al enhances the wettability of the solders...
In this presentation, we report a simple and effective method for improving the performance of CH3NH3PbI3 perovskite solar cells. By employing a novel hot-air annealing process (HAAP) and a merged annealing method (MA) for preparing the perovskite CH3NH3PbI3 film, we could successfully enhance the crystallinity of the CH3NH3PbI3 active layer and improve its photon collection properties. This led to...
This work presents a template matching-based approach tackling image drift during Electron Beam induced Deposition of nano-granular metal structures. An automation sequence including a drift compensation routine is implemented using a self-developed software framework. A template matching algorithm simultaneously processing multiple templates adapts to the continuously changing image periodically...
To realize an intracellular contact between nanoelectrodes and cells, a sufficient small electrode diameter is needed [1]. A sacrificial layer process developed by the Fraunhofer IMS using deep reactive ion etching and atomic layer deposition [2] is varied. A double hard mask technique is used to taper structures in a sacrificial layer and thereby the nanoelectrodes' diameter. The principles and evaluation...
The key role that underfill materials play in highly reliable, advanced flip chip organic packages has generated an increased focus on their behavior and structure. One such behavior relates to the observation of filler separation from the resin matrix which, to date, has been predominantly attributed to gravity or capillary flow. The phenomenon of silica filler separation is discussed in the context...
In this study we present a novel substrate for the investigation of cell response, behavior and attachment to the surface of iron oxide nanopillars. The material was fabricated using an anodic aluminum oxide template to electroform nanopillars of iron oxide. The lengths of the rods were controlled by the electroforming time and this has a direct influence on the stiffness of the nanopillars. The material...
The interfacial reactions in Sn, Sn-3.0Ag-0.5Cu (SAC, in wt%) and Sn-9Zn (SZ, in wt%) lead-free solders reacting with the Cu-40Zn alloys were investigated. The results were indicated that the (Cu, Zn)6Sn, and (Cu, Sn)Zn phases were formed in the Sn/Cu-40Zn couple reacted at 240 and 270 °C. When the reaction temperature was increased to 300 °C, the (Cu, Sn)Zn with the layered structure and metastable...
We demonstrate a simple way to grow continuous and single-layer MoS2 film by LPCVD (Low Pressure Chemical Vapor Deposition) in centimeter scale. The as-grown MoS2 films are characterized by optical microscopy (OM), scanning electron microscopy (SEM), Raman spectroscopy, photoluminescence (PL) spectroscopy, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). The layer number of...
Crack and dislocation of direct wafer bonded silicon diaphragm on silicon dioxide layer of silicon substrate containing cavity were analyzed. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and focused ion beam (FIB) were conducted on cracked silicon diaphragm to understand the mechanisms of crack initiation and propagation. SEM analysis results show that the crack initiated...
It is of great importance to pick up a single carbon nanotube (CNT) from a bulk of CNTs for nanodevice fabrication. In this study, we have proposed a nanorobotic manipulation system allowing automated pick-up of CNTs based on visual feedback. We utilize histogram normalization for automatic binarization, and it achieves to clearly distinguish CNTs from substrate and other impurities under different...
A simple and effective method to grow GaN on Si substrates has been achieved. The method that GaN comes out from a submicron and deep hole with nearly zero dislocations above the mask is demonstrated. This work proves that reducing the epitaxy area by using mask and increasing the depth to width ratio of pattern contribute to filtering the dislocations and improving the quality of GaN.
We present a fabricating method for all-solid-state LiNi0.5Mn1.5O4/LiPON/SiNx structure flexible lithium micro-batteries using excimer laser annealing system. Excimer laser annealing can selectively crystallize LiNi0.5Mn1.5O4 cathode thin film in low temperature without thermal damage of substrate. Structural properties of the thin films were investigated by X-ray diffraction (XRD), transmission electron...
Recently, the eco-friendly vehicles such as Hybrid Electric Vehicle (HEV) and Electric Vehicle (EV) have been spotlighted. EV has power semiconductors which generate a lot of heat. So, the power semiconductors have to guarantee reliability because it is driven at high temperature. Furthermore, it was able to be driven at a higher temperature by developing the semiconductor devices such as SiC and...
This work intends to investigate strain fields around cracks in thin metallic film deposited on flexible substrate through an experimental approach. The studied sample consists of a pre-cracked silver nanoparticles inkjet printed layer with a thickness of 2 µm deposited on 125 µm thick polyimide substrates. The mechanical induced failure experiments are performed on a tensile testing device installed...
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