Browsing by Author "Wu, SY"

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A floating well method for exact capacitance-voltage measurement of nano technology
(2003-06-01)
Su, HD
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Chiou, BS
;
Wu, SY
;
Chang, MH
;
Lee, KH
Small gate area with short gate length reduces the C-V distortion of ultrathin oxide devices, but results in high parasitic capacitance/total capacitance ratio. The floating well method can exclude the parasitic capacitance to obtain accurate inversion oxide thickness without using any dummy pattern. It is suitable for nano technology.
Bi-mode breakdown test methodology of ultrathin oxide
(2003-12-01)
Su, HD
;
Chiou, BS
;
Ko, CY
;
Wu, SY
;
Chang, MH
The breakdown detections of ultrathin oxide (1.4-2 nm) using a fast voltage ramp have been studied. It was found that the breakdown voltage test of deep sub-micron technology requires the reduction of the gate area of test patterns and therefore the increase of the number of structures due to a large inversion gate current at a low electrical field (> 0. 1 A/cm(2) at 1 V) caused by the scaling down of oxide thickness. The gate current in accumulation mode is smaller than that in inversion mode by more than two orders of magnitude at a low applied voltage (1 V). The bi-mode model proposed in this paper applies a voltage stress in the inversion mode and detects failure in the accumulation mode to enhance the robustness of the breakdown test and reduce the possibility of pseudo breakdown failure. With the proposed method, a shorter test time with an increased test pattern area to improve the efficiency of the breakdown test of ultrathin oxide is achieved.
Characteristics of oxide breakdown and related impact on device of ultrathin (2.2 nm) silicon dioxide
(2003-09-01)
Su, HD
;
Chiou, BS
;
Wu, SY
;
Chang, MH
;
Lee, KH
The oxide breakdown characteristics of ultrathin oxide (2.2 nm) have been studied in this paper. Light emission microscopy (EMMI) analysis shows that each breakdown has a specific failure location with a random distribution. Gate leakage current increases for all soft breakdown events are similar. After soft breakdown, the I-V curve still shows the representative direct tunneling characteristics and can be fitted using a dual direct tunneling (DDT) model. Soft breakdown has no effect on the drain current of long-channel devices. Breakdown at the polyedge appears to be of the hard-breakdown mode and results in an abrupt increase in gate current. For short-channel devices, the polyedge is always within the damaged region of an oxide because the channel is shorter than the damaged region of the oxide. Hence, only hard breakdown resulting in permanent damage is observed in short-channel devices.
Improving the quality of liquid-crystal projection image by multilevel diffractive grating technique
(1999-07-01)
Ko, FJ
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Wu, CK
;
King, HJ
;
Wu, SY
;
Shieh, HPD
A technique using multilevel diffractive gratings to suppress the discrete nature of liquid crystal display (LCD) projection images is demonstrated. The multilevel diffractive gratings, having a cross section similar to a staircase, are fabricated by VLSI processes and plastic molding. Upon positioning the diffractive gratings on the front surface of the LCD panel, the output light beams emitted from each pixel are diffracted mainly into the zeroth and the +/-first diffraction order light beams of equal energy. The light beams transformed by the diffractive gratings into orders higher than zeroth are able to fill up the dead space between each subpixel, and generate an array of images from each subpixel. As a result, the spatial frequency of the color subpixel distribution within the whole image is increased. Accordingly, the grain-like pixel structure in projection images is removed, at a slight expense of image resolution.
Optimal assignment of mobile agents for software authorization and protection
(1999-01-15)
Shieh, SP
;
Lin, CT
;
Wu, SY
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資訊工程學系
;
Department of Computer Science
In this paper, a model for software authorization and protection in mobile code systems is proposed. In the model, a software is partitioned into objects, called mobile agents, and the privileges to access these agents are separated and distributed to the user's local system and a number of trusted servers called trusted computational proxies. The execution of a program (software) is conducted by cooperation of the agents and the proxies that contain them. Two agents are dependent if there is a message passing between them. To reduce the risk of software being attacked,dependent agents are distributed to different proxies. In this way, if a proxy is compromized, minimal information of the software will be disclosed. Methods for assigning agents to proxies are also proposed to minimize, under the security constraints, computation load of the proxies as well as communication load between the user's local system and proxies. (C) 1999 Elsevier Science B.V. All rights reserved.
Styrene/maleimide copolymer with stable second-order optical nonlinearity
(1996-08-01)
Sung, PH
;
Chen, CY
;
Wu, SY
;
Huang, JY
;
光電工程學系
Radical copolymerization of N-(azo dye) maleimide or N-(substituted phenyl) maleimide and styrene were carried out using 2,2'-azobis-isobutyronitrile as an initiator in THF at 60 degrees C. These copolymers exhibit high solubility in most of the organic solvents and excellent thermal stability up to 280 degrees C under nitrogen atmosphere. The copolymer films which were heated at 200-240 degrees C under high corona field exhibit d(33) = 3-5 pm/V, in the Maker-fringe measurement. Experimental results also showed that the copolymer with azo dye as chromophore did not decay in second harmonic response even at 130 degrees C. (C) 1996 John Wiley & Sons, Inc.
Styrene/maleimide copolymer with stable second-order optical nonlinearity
(1996-08-01)
Sung, PH
;
Chen, CY
;
Wu, SY
;
Huang, JY
;
光電工程研究所
Radical copolymerization of N-(azo dye) maleimide or N-(substituted phenyl) maleimide and styrene were carried out using 2,2'-azobis-isobutyronitrile as an initiator in THF at 60 degrees C. These copolymers exhibit high solubility in most of the organic solvents and excellent thermal stability up to 280 degrees C under nitrogen atmosphere. The copolymer films which were heated at 200-240 degrees C under high corona field exhibit d(33) = 3-5 pm/V, in the Maker-fringe measurement. Experimental results also showed that the copolymer with azo dye as chromophore did not decay in second harmonic response even at 130 degrees C. (C) 1996 John Wiley & Sons, Inc.