Browsing by Author "Lin, J. W."

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Low threshold voltage and high drive current poly-silicon thin film transistors using Ytterbium metal gate and LaAlO3 dielectric
(2007)
Hung, B. F.
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Wu, C. H.
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Chin, Albert
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Wang, S. J.
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Lin, J. W.
We have demonstrated high-performance metal-gate/high-k Ytterbiuni/LaAlO3 low-temperature poly-Si (LTPS) thin film transistors (TFTs) that have both high drive current capability and high voltage operation. The high drive current is due to the combined effect of low work-function Ytterbium metal gate and high gate capacitance by high-k LaAlO3 dielectric. The high breakdown voltage is also due to the high-k LaAlO3 dielectric to give larger physical thickness at the same equivalent oxide thickness (EOT). The good reliability and full process compatibility are the other important merits for Ytterbium/LaAlO3 device.
NUMERICAL INVESTIGATION OF A N2O/HTPB HYBRID ROCKET MOTOR WITH A DUAL-VORTICAL-FLOW (DVF) DESIGN
(2017-12-01)
Lai, A.
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Lin, Y. C.
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Wei, S. S.
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Chou, T. H.
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Lin, J. W.
A compact hybrid rocket motor design that incorporates a dual-vortical-flow (DVF) concept is proposed. The oxidizer (nitrous oxide, N2O) is injected circumferentially into various sections of the rocket motor, which are sectored by several solid fuel "rings" (made of hydroxyl-terminated polybutadiene, HTPB) that are installed along the central axis of the motor. The proposed configuration not only increases the residence time of the oxidizer flow, it also implies an inherent "roll control" capability of the motor. Based on a DVF motor geometry with a designed thrust level of 11.6 kN, the characteristics of the turbulent reacting flow within the motor and its rocket performance were analyzed with a comprehensive numerical model that implements both real-fluid properties and finite-rate chemistry. Data indicate that the vacuum specific impulse (Isp) of the DVF motor could reach 278 s. The result from a preliminary ground test of a lab-scale DVF hybrid rocket motor (with a designed thrust level of 3,000 N) also shows promising performance. The proposed DVF concept is expected to partly resolve the issue of scalability, which remains challenging for hybrid rocket motors development.
Thermal leakage improvement by using a high-work-function ni electrode in high-kappa TiHfO metal-insulator-metal capacitors
(2007)
Chiang, K. C.
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Huang, C. C.
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Pan, H. C.
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Hsiao, C. N.
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Lin, J. W.
An unavoidable drawback when using high-kappa dielectrics in capacitors is the small bandgap and the related reduction in the band-offset, which results in a large leakage current at elevated temperatures. We report improvements in the thermal leakage current by using Ni as a high-work-function top electrode for high-kappa TiHfO capacitors. This avoids sacrificing the overall kappa value by using a multilayer or laminate structure and results in better voltage linearity, which is important for analog/radio frequency integrated circuits. (c) 2007 The Electrochemical Society.
Very high density (44 fF/mu m(2)) SrTiO3 MIM capacitors for RF applications
(2007)
Chiang, K. C.
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Lin, J. W.
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Pan, H. C.
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Hsiao, C. N.
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Chen, W. J.
We demonstrate a high-performance TaN/SrTiO3/TaN metal-insulator- metal (MIM) radio-frequency (rf) capacitor with good device integrity of very high capacitance density of 44 fF/mu m(2), small voltage linearity alpha of 54 ppm/V-2 at 2 GHz, and a small capacitance reduction 3.5% from 100 KHz to 10 GHz. Such large capacitance density can largely reduce the device size used in rf integrated circuits. (c) 2007 The Electrochemical Society.