Time filter

Source Type

Huang Y.-T.,National Cheng Kung University | Wu S.-L.,Cheng Shiu University | Chang S.-J.,Institute of Electro Optical Science and Engineering | Kuo C.-W.,National Cheng Kung University | And 3 more authors.
IEEE Transactions on Nanotechnology | Year: 2011

Implementation of strained-Si MOSFETs with optimum low-cost stress-memorization technique for a 40-nm technology CMOS process was demonstrated. Devices fabricated on (100) substrate with 100channel orientation provide additional 8% current drivability improvement for strained-Si nMOSFETs without any degradation of pMOSFETs performance. The stress-memorization technique (SMT) mechanism was experimentally verified by studying the impact of layout geometry (length of source/drain LS/D and polyspacing) on the device performance. In the SMT devices with LS/D down to 0.11 m and polyspace reduced to 120 nm, no obvious current improvement and more performance degradation are observed compared with control device (only strained contact etch-stop layer), indicating that the benefit of the SMT is substantially eliminated and showing that the SMT-induced stress is mainly originated from the source/drain region in our case. © 2010 IEEE.

Huang Y.-H.,National Cheng Kung University | Ko S.-W.,National Cheng Kung University | Fuh A.Y.-G.,Institute of Electro Optical Science and Engineering
Proceedings of the International Display Workshops | Year: 2012

This paper demonstrated the research of axially symmetric dye-doped liquid crystal (ASDDLC). Axially symmetric devices were widely used in symmetric optics, such as converting linear polarized light into axially, azimuthally or vortically light. The novel applications have been presented, such as polarization-independent liquid crystal lens and tunable donut beam.

Ho T.-Y.,Institute of Electro Optical Science and Engineering | Lee C.-Y.,Institute of Electro Optical Science and Engineering | Kuo C.-W.,National Cheng Kung University | Tang F.-C.,National Cheng Kung University | And 3 more authors.
Electrochemical and Solid-State Letters | Year: 2010

We demonstrate a plasma-beam-processed polyimide (PI) surface to effectively align liquid crystal (LC) molecules. The pretilt angles of LCs can be varied between 0 and 3.5°, and the PI surface energy can be adjusted by controlling the plasma beam with an energy of 450 eV at an incident angle varying from 0 to 80° with respect to the normal direction of the substrate. Additionally, a method was developed to quickly evaluate the level of anchoring force of LC when compared with a rubbed-aligned LC cell. The performance of this method should be under LC cells with the same alignment materials. © 2010 The Electrochemical Society.

Yeh B.-L.,Institute of Electro Optical Science and Engineering | Chen Y.-H.,Institute of Electro Optical Science and Engineering | Chiu L.-Y.,Institute of Electro Optical Science and Engineering | Lin J.-W.,Institute of Electro Optical Science and Engineering | And 6 more authors.
Journal of the Electrochemical Society | Year: 2011

We demonstrate a simple and an inexpensive approach for the low-temperature fabrication (<200°C) of low-voltage-operated (<20 V), organic, pentacene-based, nonvolatile memory devices with a high- k hafnium dioxide (Hf O2) main dielectric layer and a polymer electret layer. Two kinds of polymer insulators were used as the electret layer, i.e., a poly(vinylalcohol) (PVA) with strong polar groups and an amorphous poly(methyl methacrylate) (PMMA). We studied the memory characteristics of the corresponding devices, including writing and erasing process, long-term retention, and multiple continuous writing/erasing cycles' endurance testing. The memory windows in devices with PVA can be attributed to the dominant short-lifetime shallow traps located at the PVA/pentacene interface and in the pentacene film, whereas those in devices with PMMA are mainly due to the long-lifetime deep traps located in the PMMA layer. The possible sources of shallow-type and deep-type traps in the memory devices were discussed. Accordingly, the devices with the PMMA layer show superior memory characteristics, including a stable memory window of approximately 2.5 V after 20 V 1 s pulse, retaining 80% of memory windows after 103 s and a good endurance properties. © 2011 The Electrochemical Society.

Lee Y.-C.,National Cheng Kung University | Lee Y.-C.,Institute of Electro Optical Science and Engineering | Chang Y.-H.,National Cheng Kung University | Chen Y.-Y.,Institute of Electro Optical Science and Engineering | And 2 more authors.
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2010

This work analyses the effects of polarization and pressure in caesium 6S-8S two-photon spectroscopy. The linewidth was broadened and the frequency was shifted by a change of polarization states. The frequency shift and the linewidth broadening of the caesium 6S-8S two-photon transition were measured as a function of laser power using one single-frequency Ti:sapphire ring cavity laser, two caesium cells and two quarter-wave plates to ensure polarization states of light, and we showed that the linewidth cannot be evaluated just by fitting data to a Lorentzian shape. As determined by fitting the data to a Voigt profile, the natural linewidth is independent of the polarization states of the pump beams, the laser power and the pressure. Caesium 6S-8S two-photon transitions pumped by a circularly polarized beam have narrower linewidths and smaller shifts than those pumped by a linearly polarized beam. The light shift obtained by pumping with the circularly polarized beam is -6.75(57) Hz (mW mm-2)-1, and that obtained by pumping with a linearly polarized beam is -7.25(45) Hz (mW mm-2)-1. These results agree closely with theoretical calculations. The pressure shift is -588(387) Hz mPa-1. This work shows how to evaluate two-photon transitions with a Voigt profile, and then helps us to understand two-photon transitions with different polarization states, and improve the signal quality obtained when they are used as frequency markers. © 2010 IOP Publishing Ltd.

Discover hidden collaborations