• 태양에너지
• /
• 제8권1호
• /
• pp.41-48
• /
• 1988

Heterojunction solar cells of $n-Cd_{1-x}Zn_xS/p-Si$ were fabricated by solution growth technique. The crystal structure, spectral response, surface morphology, and I-V characteristics of the $n-Cd_{1-x}Zn_xS/p-Si$ heterojunction solar cells were studied. The $Cd_{1-x}Zn_xS$ layer deposited on a silicon substrate (111) were found to be a cubic structure with the crystal orientation (111), (220) of the CdS and to be a hexagonal structure with crystal orientation (100) of the ZnS. The open-circuit voltage, short-circuit current, fill factor, and conversion efficiency of $n-Cd_{1-x}Zn_xS/p-Si$ heterojunction solar cell under $100mW/cm^2$ illumination were found to be 0.43V, 38mA. 0.76, and 12.4%, respectively.

• 대한화학회지
• /
• 제56권3호
• /
• pp.348-356
• /
• 2012

In an attempt to find a new class of bisazo disperse dyes with better dyeing properties, a series of novel bisazo dyestuffs based on 4-arylhydrazono-3-(2'-hydroxyphenyl)-1-phenyl-2-pyrazolin-5-ones $\mathbf{3a-f}$ were prepared by diazocoupling of p-nitrophenyl diazonium chloride with 4-arylhydrazono-3-(2'-hydroxyphenyl)-1-phenyl-2-pyrazolin-5-ones $\mathbf{2a-f}$. Compounds $\mathbf{3a-f}$ were subsequently reacted with acetic anhydride in the presence of p-toluenesulfonic acid afford the corresponding O-acetyl derivatives $\mathbf{4a-f}$. The latter products as well as spectral data indicated that compounds $\mathbf{3a-f}$ exist predominantly in the azo-hydrazone tautomeric form (H) as the ZE-configuration. Additionally, two series of the synthesized dyes $\mathbf{3a-f}$ and $\mathbf{4a-f}$ were applied as disperse dyes for dyeing polyester fabrics and their fastness properties were evaluated. Also the position of color in CIELAB coordinates ($L^*$, $a^*$, $b^*$, $H^*$, $C^*$*) was assessed.

• 한국결정성장학회지
• /
• 제9권2호
• /
• pp.212-216
• /
• 1999

SiC(3C) 광다이오드는 p-형 Si 위에 tetramethylsilane (TMS)를 열분해아여 화학기상증착법으로 성장된 SiC(3C) 에피층을 성장하여 제작되었다. SiC(3C)의 전기적 특성은 홀 측정(Hall measurement) 및 전류-전압(I-V) 특성으로 조사되었다. SiC(3C) 에피층의 전도형은 n-형이었다. 저항성 접촉은 마스크 (shadow-mask)를 통해서 Al을 열증착하여 형성하였다. SiC(3C)광다이오드의 광학적 이득(photovoltaic detection)를 해석하기 위하여 SiC(3C) 에피층의 Spectral response (SR)를 전기적 변수(electrical parameter) 및 광다이오드의 기하학적 구조(geometric structure)를 고려하여 계산하였다. 적절히 선정된 변수들로부터 계산된 SR의 최대값은 550 nm에서 약 0.75이었고, 파장영역 400~600 nm 사이에서 청색 및 근자외선 광검지기로서 매우 유용하다.

• 한국지진공학회논문집
• /
• 제1권2호
• /
• pp.17-29
• /
• 1997

교량의 내진설계에 있어서 일반적인 중.소지간의 교량에 적용하도록 규정법 단일모드 스펙트럼 해석법은 비교적 작은 규모의 단순교량에 적용되는 있는 간단한 내진설계방법에며 국내외를 통틀어 가장 많이 사용되는 방법이다. 그러나 최근에 들어서부터 구조형상이 복잡해지고 지간이 길고 교각고가 높은, 규모가 큰 비정형 교량이 많이 시공되고 있으며 이러한 경우에는 교량의 안전과 경제적, 효율적인 설계를 위해서 반드시 다중모드 스펙트럼 해석법이나 입력지진파에 의한 시간이력해석에 의해서 검토되는 것이 바람직하다.다중모드 스펙트럼 해석법의 경우에는 교량의 형식, 경간의 수, 교각의 강성, 인접교각과의 상대적 강성 및 상부구조의 지지조건 등에 따라서 같은 유형의 교량이라 하더라도 진동응답은 각기 다르기 때문에 일률적인 규칙을 적용하는데에는 어려움이 있다. 따라서 본 연구에서는 도로교량에 대한 효율적인 내진설계가 이루어지기 위해서, 교량이 진동응답 및 특성을 파악할 수 있는 3차원 동적해석 프로그램을 작성하여 내진해석이 용이하게 이루어질 수 있도록 하였으며, 후처리 프로그램을 사용하므로써 동적해석프로그램에 의한 결과를 곧바로 내진설계에 반영할 수 있도록 하였으며, 후처리 프로그램을 사용하므로써 동적해석프로그램에 의한 결과를 곧바로 내진설계에 반영할 수 있도록 하였다. 또한 교량의 형식, 규모, 지지조건 등의 변화에 따른 동적 해석결과로부터 적절하고 효율적인 내진설계의 기준을 제시하였다.

• 한국염색가공학회:학술대회논문집
• /
• 한국염색가공학회 2011년도 제44차 학술발표회
• /
• pp.35-35
• /
• 2011

The design and preparation of novel dye rotaxanes have gained much interest recently, since such structure usually exhibits peculiar spectral and optical changes. In spite of the promising results to date, increasing pressure remains to develop novel supramolecular structures based on stimuli-responsive systems. This presentation covers the study of inclusion complexes of cyclodextrins and various chromophores, with an emphasis on our most recent outcome of anisotropic hydrogel. In this system, physical gelation prepared from simple mixture of CD and a azo dye is completed through specific host-guest interaction. The obtained hydrogel exhibits respective morphological transitions based on supramolecular assembly and dissociation, leading to either precipitation or a sol-to-gel transition. It can identify different classes of metal ions, and, among them, naked-eye differentiation of lead ion is possible due to the coordination-induced unthreading of dye molecules. Accompanying structural changes were verified by numerous characterization techniques, including 2D-ROESY, HR-MAS, UV-Visible absorption, small-angle X-ray scattering, and induced circular dichroism measurements. Such properties discussed here will find useful in analytical applications, such as metal ion sensing and removal applications.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
• /
• pp.1440-1442
• /
• 2007

In this work, we have modeled and fabricated microcavity-enhanced OLED using the 1-dimensional distributed Bragg reflector model (DBR). Results show that simulated spectrum intensity of microcavity OLED increased more than 30% compared to the conventional OLED, by use of DBR with $TiO_2$ and $SiO_2$. Spectral change of green and blue emission was expected to give the deeper color. The experimental design and characterization as well as the matching with simulated properties were performed for microcavity OLED for actual application.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
• /
• pp.111-111
• /
• 2012

In this talk, we represent a novel approach to investigating intra-nanorod surface plasmon coupling with control over block compositions. The multi-component rod-like nanostructures, which consist of optically active components (Au and Ag) and optically less active component (for example, Ni) in UV-vis-NIR spectral window, showed interesting optical response depending on each block length and the total length of the structure. By controlling the composition and relative lengths of the blocks that comprise these structures, we can tailor the overall optical properties. Depending on the relative fraction of Au and Ag blocks, the intensity of the transverse modes varied without noticeable peak shifts. However, the strong intraparticle surface plasmon coupling resulted in the collective appearance of longitudinal LSP modes, including higher-order modes. The experimental observations were confirmed by theoretical calculation, using a discrete dipole approximation method. In addition, we will briefly discuss how single nanorod solar cells can be synthesized by using by using electrochemical deposition and AAO hard templates.

• 천문학회보
• /
• 제44권1호
• /
• pp.73.5-73.5
• /
• 2019

Studying the amount and kinematics of circumand intergalactic medium (CGM and IGM) is key to understanding the role of feedback and environment (cold streams and galactic winds) in the evolution of galaxies. In particular, $Ly{\alpha}$ emission line has been utilized to investigate the density structure and kinematics of the (most abundant) H I gas in the CGM and IGM around galaxies. Therefore, modeling $Ly{\alpha}$ radiative transfer through multiphase interstellar medium (ISM), CGM and IGM is crucial in understanding the galaxy evolution. As discussed in Kakiichi & Dijkstra (2018), most $Ly{\alpha}$ RT effects would occur on interstellar scales. This is because the main source of $Ly{\alpha}$ photons would be H II regions, which are in most cases, if not all, surrounded by "cold" photo-dissociation regions. However, most $Ly{\alpha}$ RT studies have been performed in the CGM and IGM environments with T ~ 10,000K. In this talk, we present how the $Ly{\alpha}$ RT effect in the cold ISM with T ~ 100 K regulates the $Ly{\alpha}$ spectral properties.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
• /
• pp.75-76
• /
• 2006

olycrystailine CdSe thin films were grown on ceramic substrate using a chemical bath deposition (CBD)method. They were annealed at various temperature and X-ray diffraction patterns were measured by X-ray diffractometer in order to study CdSe polycrystal structure. Its grain size was about 0.3 ${\mu}m$. Hall effect on this sample was measured by Van der Pauw method and studied on carrier density and movility depending on temperature. We measured also spectral response, sensitivity($\gamma$), maximum allowable power dissipation and response time on these samples.

• 천문학회보
• /
• 제35권1호
• /
• pp.69.2-69.2
• /
• 2010

The far-ultraviolet (FUV) H2 and C IV emission images and spectra of Orion Eridanus Superbubble (OES) is hereby presented. The OES seems to consists of multiple phase through the detection of highly-ionized gas and pervasive neutral hydrogen. The former is traced by hot gas while the latter is traced by cold medium. A spectral image made with H2 fluorescent emission shows that the spatial distribution of hydrogen molecule is well correlated with the dust map. The model spectra was taken from a photodissociation region (PDR) radiation code which find a best suitable parameter such as hydrogen density, gas temperature and incident uv intensity of the radiation field. C IV emission is caused by intermediate temperature ISM about 10^4.5 K~10^6 K. Therefore we could get more clear evidence to reveal the structure of OES. Feature of spectra for the each sub region is also presented and discussed. The data were obtained with the Far-Ultraviolet Imaging Spectrograph (FIMS) and the whole data handling were followed by previous FIMS analysis.