Homoepitaxial growth on 4H-SiC Si-face substrates with sizes corresponding to 150 mm was carried out. The influence of growth conditions for uniformity and epitaxial defect density was investigated. A 150 mm size was ...
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Homoepitaxial growth on 4H-SiC Si-face substrates with sizes corresponding to 150 mm was carried out. The influence of growth conditions for uniformity and epitaxial defect density was investigated. A 150 mm size was realized by using two 76.2 mm wafers lined up in a radial direction. C/Si ratio is found to be a major parameter for controlling triangulardefect density and the generation of step bunching. As a result, the surface morphology without bunched step structure and the triangulardefect density with 0.5 cm−2 were obtained by decreasing C/Si ratio to 1.0 on the size corresponding to 150 mm. Under this condition, good carrier concentration and thickness uniformity of σ/mean =15.2 % and 1.7 % could be obtained.
40GHz radio over fibre (rOF) downlink system is constructed to demonstrate Hd video transmission capability using the hybrid optical and wireless system. The dual-sideband optical carrier suppression (dSB-OCS) techniq...
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40GHz radio over fibre (rOF) downlink system is constructed to demonstrate Hd video transmission capability using the hybrid optical and wireless system. The dual-sideband optical carrier suppression (dSB-OCS) technique is used in conjunction with the minimum transmission bias (MiTB) to generate optical millimetre wave signal by utilizing a dual electrode Mach-Zehnder modulator (dE-MZM). A baseband high definition (Hd) video signal is modulated into the system via a second MZM. The signal is distributed to a remote antenna unit (rAU) using a 20km optical fibre, then transmitted wirelessly to a customer premise equipment (CPE) located at 5m away. The results show that the Hd video is successfully transmitted over the error free 40GHz rOF downlink system.
Modified TiO2 films have been prepared by combining commercial titania powders （degussa P25） with sol-gel made by titanium chloride （Ti-sol）. The result shows that clusters are formed by nanoparticles and large po...
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Modified TiO2 films have been prepared by combining commercial titania powders （degussa P25） with sol-gel made by titanium chloride （Ti-sol）. The result shows that clusters are formed by nanoparticles and large pores can be seen on the surface of the TiO2 films. The short circuit photocurrent density and photoelectric conversion efficiency of the solar cells are obviously enhanced compared with those without modification. The relationship between the photoelectric conversion efficiency and the amount of Ti-sol was investigated. With the addition of 30 wt% Ti-sol, the photoelectric conversion efficiency as high as 9.75% is achieved, increasing by 28.3% compared with the solar cells without modification.
A new pixel circuit with pixel memory is proposed for field sequential colordisplay. The new pixel circuit associated with its unique driving scheme can solve voltage residue problem.
A new pixel circuit with pixel memory is proposed for field sequential colordisplay. The new pixel circuit associated with its unique driving scheme can solve voltage residue problem.
Instability of amorphous silicon TFT has been a major challenge in designing a shift register of gate driver. We proposed in this paper a novel amorphous silicon gate driver (ASG). A 2.8 inch QVGA TFT-LCd prototype dr...
Instability of amorphous silicon TFT has been a major challenge in designing a shift register of gate driver. We proposed in this paper a novel amorphous silicon gate driver (ASG). A 2.8 inch QVGA TFT-LCd prototype driven by proposed ASG has been successfully fabricated. Stable operation within 240 hours at 70 °C temperature has been demonstrated without noticeable failure or artifacts.
We have developed a mobile display using wide-color-gamut(WCG)-white-LEds. An LCd with WCG-white-LEds has almost the same color gamut (103% u'v'diagram) as that with WCG-CCFLs developed by Sony. A red-emitting...
We have developed a mobile display using wide-color-gamut(WCG)-white-LEds. An LCd with WCG-white-LEds has almost the same color gamut (103% u'v'diagram) as that with WCG-CCFLs developed by Sony. A red-emitting-phosphor with the longer luminescent wavelength should be used in WCG-white-LEd to achieve WCG, because of the emission originated from 4f-5d transition.
In this paper, an innovative 4G antenna solution operating in the 698-960 MHz band, is presented. It is composed of two radiating elements recombined in a single feed antenna-system using an integrated powerdivider/c...
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In this paper, an innovative 4G antenna solution operating in the 698-960 MHz band, is presented. It is composed of two radiating elements recombined in a single feed antenna-system using an integrated powerdivider/combiner, synthesized thanks to five lumped components. Simulations using realistic SMd (Surface Mount devices) components allow reaching a matching better than -6 dB, confirmed by measurement and an average total efficiency of 30% over the full frequency band. These results are benchmarked with the performance of measured commercial handset antennas, demonstrating a key improvement of the achievable bandwidth and total efficiency. Proposed solution seems promising in order to address 4G wideband antenna design challenges.
Untreated agricultural wastes are most harmful to the environment. Three large quantities of agricultural wastes including water hyacinth, oil extraction residue and mushroom waste were selected to investigate the pot...
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