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Plasma-Doped Si Nanosheets for Transistor and <i>p-n</i> Junction Application
Lee, Jaejun,Kwon, Juyoung,Seo, Dongjea,Na, Jukwan,Park, Sangwon,Lee, Hyo-Jung,Lee, Seung-Woo,Lee, Ki-Young,Park, Tae-Eon,Choi, Heon-Jin American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.45
<P>Since the discovery of graphene, layered transition metal dichalcogenides (TMDs) have been considered promising materials for applications in various fields because of their fascinating structural features and physical properties. Doping in semiconducting TMDs is essential for their practical application. In this regard, two-dimensional (2D) Si materials have emerged as a key component of 2D electronic, optics, sensing, and spintronic devices because of their complementary metal-oxide-semiconductor (CMOS) compatibility, high-quality oxide formation, moderated bandgap, and well-established doping techniques. Here, we report the tuning of the electronic properties of Si nanosheets (NSs) using a plasma-doping technique. Using this doping process, we fabricated <I>p</I>-<I>n</I> homojunction diodes and transistors with Si NSs. The estimated high ON/OFF ratio of ∼10<SUP>6</SUP> and field-effect hole mobility of 329 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP> suggest a high crystal quality of the Si NSs. We also demonstrate vertically stacked heterostructured <I>p</I>-<I>n</I> junction diodes with MoS<SUB>2</SUB>, which exhibit rectifying properties and excellent light response.</P> [FIG OMISSION]</BR>
Isolated Gastric Varix Bleeding Caused by Splenic Vein Obstruction: Two Case Reports
Juyoung Pak,Sangjoon Lee,Hyoung Nam Lee,Dongho Hyun,Sung-Joon Park,Youngjong Cho 대한영상의학회 2023 대한영상의학회지 Vol.84 No.1
Isolated left-sided portal hypertension is a rare clinical syndrome caused by splenic veno-occlusive disease. Splenic vein thrombosis and extrinsic compression causes proximal splenic vein hypertension, and the splenic blood flows into the superior mesenteric or portal vein through the upper stomach’s collateral vessels, such as the short gastric, coronary, and gastroepiploic veins. Open splenectomy is recommended to treat gastrointestinal bleeding caused by isolated left-sided portal hypertension. Interventional management could be a clinically useful option for selected patients who want to avoid surgical corrections. The report presents two cases of left-sided portal hypertension with gastric variceal bleeding.