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Off-state Leakage Currents of MOSFETs with high- k Dielectrics
장성일 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.6
In this research, the off-state leakage current characteristics were studied for different device structures having a high- dielectric as a gate dielectric and/or a spacer. A guideline to reduce the off-state leakage current is given in terms of the gate dielectric and the spacer structures. Several structures were compared in terms of dielectric constant, equivalent oxide thickness (EOT), and drain-induced barrier lowering (DIBL). The E-eld contour, which is responsible for the gateinduced drain leakage (GIDL), was shown. The device structure in which the high- dielectric extends to the bottom of the oxide spacers showed the smallest GIDL current while the device structure in which the interface between the high- gate dielectric and the oxide spacer met at the lightly-doped drain (LDD) region of the silicon substrate showed the best DIBL characteristics. Also, the device structure having a gate dielectric stack of high- gate dielectric/buffer SiO2 spacer was shown to be reasonable for suppressing the GIDL. As the EOT became thinner because of using a high- dielectric, the off-state leakage current, which was aected by the GIDL current, becomes severe.
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Magnetic Compression Anastomosis for the Treatment of Post-Transplant Biliary Stricture
장성일,조재희,이동기 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.3
A number of different conditions can lead to a bile duct stricture. These strictures are particularly common after biliary operations,including living-donor liver transplantation. Endoscopic and percutaneous methods have high success rates in treating benign biliarystrictures. However, these conventional methods are difficult to manage when a guidewire cannot be passed through areas of severestenosis or complete obstruction. Magnetic compression anastomosis has emerged as an alternative nonsurgical treatment methodto avoid the mortality and morbidity risks of reoperation. The feasibility and safety of magnetic compression anastomosis have beenreported in several experimental and clinical studies in patients with biliobiliary and bilioenteric strictures. Magnetic compressionanastomosis is a minimally traumatic and highly effective procedure, and represents a new paradigm for benign biliary strictures thatare difficult to treat with conventional methods.
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