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2차원 채널 물질을 활용한 전계효과 트랜지스터의 저항 요소 성능 영향성 분석
홍태영(TaeYeong Hong),반학준(HakJun Ban),홍슬기(Seul Ki Hong) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
Research on novel semiconductor materials to replace Si, including the use of 2D materials as channels, is actively being conducted. However, there have been very few studies on the effects of 2D transistor variables, such as parasitic resistances and their relation to RF applications. Here we report a systematic study of those effects on electrical performance depending on the transistor structure. It is found that the access resistance and contact resistance are the dominant factors leading to degradation of the device performance, especially in deep scaled devices. A guideline for device structural parameter design for required RF performance is discussed.
고집적 반도체 시스템을 위한 2차원 채널 물질 활용 수직 구조 전계 효과 트랜지스터
공석헌(SeokHeon Kong),김준형(June Hyeong Kim),홍슬기(Seul Ki Hong) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
The use of vertically oriented 2D materials has been demonstrated for three-dimensional electronic applications. In this study, graphene was transferred along the sidewall of a dielectric. It is ossible to further scale down the channel length of the 2D material by engineering the deposited thickness of the atomic layer deposition (ALD) dielectric layer. The process integration of the proposed 2D material vertical transistor resembles that of currently commercialized transistor architecture, with a design rule of less than 20nm, implying practical usage of this form for 3D advanced FET applications.
두충나무, 황벽나무 등을 포함하는 수목추출물의 항여드름 및 항아토피 효과
김기은 ( Gi Eun Kim ),김진홍 ( Jin Hong Kim ),홍슬기 ( Seul Ki Hong ),김타곤 ( Ta Gon Kim ),김동욱 ( Dong Uk Kim ) 한국화학공학회 2010 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.48 No.6
본 연구에서는 두충나무, 황벽나무 등을 포함하는 수목추출물의 소재특성을 시험하여 화장품 및 피부질환 치료소재로서의 응용 가능성을 조사하였다. 수목추출물의 항산화력은 DPPH 자유라디칼 소거법으로 측정되었으며 저농도에서는 항산화력이 낮았으나, 1,000 ug/ml의 고농도에서는 우수한 항산화제인 비타민 C와 유사하였다. 항균력은 원판확산법으로 측정되었으며, 수목추출물은 피부상재균인 Staphylococcus epidermidis에 대해서는 낮은 항균력을 보이지만, 여드름 유발균인 Propionibacterium acne에 대해서는 높은 항균력을 보여주는 선택성 항균력이 있어, 여드름소재로서 매우 우수한 특성을 나타내었다. 무모생쥐를 이용한 항아토피 시험결과, 수목추출물은 DNCB에 의해 유도된 피부염증을 14일 째 거의 정상상태로 회복시켰으며, 피부내 항체인 IgE의 농도도 대조군에 비해 16% 낮추어주어 항아토피 효과가 우수한 것으로 나타났다. 따라서 수목추출물은 항여드름효과 및 항아토피 효과가 뛰어나서 화장품 혹은 피부질환치료소재로서 응용 가능성이 매우 높음을 알 수 있었다. In this study, plant extracts including Eucommia ulmoides Oliv, and Phellodendron amurense were studied to test possible application for cosmetics and skin related medicine. Anti-oxidation effect of plant extracts was measured by DPPH free radical scavenging activity and it was insignificant at low concentration, however, it was as good as vitamin C, excellent anti-oxidation agent, at 1,000 ug/ml. Anti-bacterial effect was tested by disc diffusion method, and plant extracts showed mild anti-bacterial effect for normal skin flora, Staphylococcus epidermidis while it indicated strong anti-bacterial effect for acne inducing Propionibacterium acne. Therefore it had powerful potential for anti-acne material because of selectivity. Anti-atopic dermatitis effect was tested by hairless mouse and plant extracts recovered damaged skin to near normal condition after 14 days of treatment. IgE concentration in treated mouse was decreased 16% compared with control. From the research, plant extracts indicated strong anti-acne and anti-atopic dermatitis effect, and showed strong potential for cosmetics and skin related medicine.