• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.337.2-337.2
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• 2016

역 구조 유기태양전지는 가격이 저렴하고 우수한 경량성, 간단한 제조공정 그리고 휘어짐이 가능한 소자를 제작할 수 있는 것이 큰 장점이다. 또한, 광활성층과 전극 사이에 표면개질 물질을 도입하여 에너지장벽을 줄임으로써 소자 전반적인 전하수송을 증가시킬 수 있게 되었다. 나아가 용액공정과 저온 공정을 통해 유기 광전자소자의 roll-to-roll 대면적화 기술을 기반으로 가격대비 성능을 개선시켰다. 본 연구에서는 CdSe 또는 CdSe@ZnS 양자점을 표면개질 유기물질인 polyethylenimine ethoxylated (PEIE)에 정전기적 인력의 결합을 통한 양자점 단일층을 얻었고 이는 전기수송층, 광흡수층 그리고 표면플라즈몬 공명(Surface plasmon resornace)의 역할을 수행하게 되면서 태양전지 전반적인 성능 향상을 관찰 할 수 있었고 양자점 단일층으로 인해 20%가 증가된 에너지변환효율 얻었다. 또한 단일층으로 형성된 CdSe 또는 CdSe@ZnS 양자점 은 $F{\ddot{o}}rster$ resonance energy transfer (FRET) 메커니즘을 통해 PC60BM과 P3HT의 Photo luminescence 세기를 99% 감쇄시켰고, CdSe 양자점을 유기 광활성층인 PTB7:PC71BM에 적용하여 8.1%의 수치를 나타내었다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.249.2-249.2
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• 2015

Connecting two or more sub-cells is a simple and effective way of improving power conversion efficiency (PCE) of solar cells, and the theoretical efficiency of this tandem cell is known to reach 85~88% of the sum of the sub-cell's efficiencies. There are two ways of connecting sub-cells in the tandem structure, i.e. parallel and series connection. The parallel connection can increase the short circuit current (Jsc) and the series connection can increase the open circuit voltage (Voc). Although various tandem structures have been studied, the full use of incident light and optimization of cell efficiency is still limited. In this work, we designed series tandem solar cells consisting of lead sulfide (PbS) quantum dots/zinc oxide-based QDSC and zinc phthalocyanine (ZnPc)/C60-based small molecule OSCs. It is expected that the loss of the incident light is minimized because the absorption range of the PbS quantum dots and ZnPc is significantly different, and the Voc increases according to the Kirchhoff's law.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.276-276
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• 2012

The interface morphology of organic active layers is known to play a crucial role in the performance of organic photovoltaic (OPV) cells. Especially, a controlled nanostructure with a large contact area between electron donor (D) and acceptor (A) layers is necessary to improve the power conversion efficiency (PCE) of the cells since the short exciton diffusion lengths in organic semiconductors limit the charge (hole and electron) separation before excitons recombination. In this work, we developed simple solvent treating methods to fabricate a nanostructured DA interface and applied them to enhance the PCE of ZnPc/C60 based small molecule OPV cells. Interestingly, it was observed that the solvent treatment on the donor layer prior to the deposition of the acceptor layer resulted in a significant decrease in PCE, which was due to an existence of undesirable voids at the DA interface. Instead, the solvent vapor treatment after the DA bilayer formation led to densely packed and well dispersed DA contacts. Consequently, 3-fold enhancement of PCE as compared to the untreated bilayer cell was accomplished.

• 한국광학회지
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• 제2권4호
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• pp.179-185
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• 1991

적외선 광원으로 $CO_2$ 레이저를 사용하였고 광속을 2.5 cm의 직경으로 확대하여 Twyman-Green 간섭계를 구성하였다. 각종 렌즈는 Ge 렌즈로, 광속분리기는 ZnSe 평행판으로 택하였다. Pyro-electric vidicon camera에 의해 CRT monitor에 간섭무늬를 제시하며 image card에 의해 digitize되고 PC로 강도분포가 입력되어 data처리된다. 여기서, 적외선 간섭무늬는 thermal paper 상에 기록하였다. 가시영역에서는 He-Nefp이저를 광원으로 하고 CCD 카메라로 검출하여 CRT monitor에 제시하였다. 파면수차함수, PSF, OTF가 계산되어 3차원 그래프로 제시되며 프린트 된다.

• Journal of Animal Science and Technology
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• 제65권5호
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• pp.1040-1052
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• 2023

The objective of this study was to investigate the protective effects of functional nutrients including various functional amino acids, vitamins, and minerals on chicken intestinal epithelial cells (cIECs) treated with oxidative stress. The cIECs were isolated from specific pathogen free eggs. Cells were exposed to 0 mM supplement (control), 20 mM threonine (Thr), 0.4 mM tryptophan (Trp), 1 mM glycine (Gly), 10 μM vitamin C (VC), 40 μM vitamin E (VE), 5 μM vitamin A (VA), 34 μM chromium (Cr), 0.42 μM selenium (Se), and 50 μM zinc (Zn) for 24 h with 6 replicates for each treatment. After 24 h, cells were further incubated with fresh culture medium (positive control, PC) or 1 mM H₂O₂ with different supplements (negative control, NC and each treatment). Oxidative stress was measured by cell proliferation, whereas tight junction barrier function was analyzed by fluorescein isothiocyanate (FITC)-dextran permeability and transepithelial electrical resistance (TEER). Results indicated that cell viability and TEER values were less (p < 0.05) in NC treatments with oxidative stress than in PC treatments. In addition, FITC-dextran values were greater (p < 0.05) in NC treatments with oxidative stress than in PC treatments. The supplementations of Thr, Trp, Gly, VC, and VE in cells treated with H₂O₂ showed greater (p < 0.05) cell viability than the supplementation of VA, Cr, Se, and Zn. The supplementations of Trp, Gly, VC, and Se in cells treated with H₂O₂ showed the least (p < 0.05) cellular permeability. In addition, the supplementation of Thr, VE, VA, Cr, and Zn in cells treated with H₂O₂ decreased (p < 0.05) cellular permeability. At 48 h, the supplementations of Thr, Trp, and Gly in cells treated with H₂O₂ showed the greatest (p < 0.05) TEER values among all treatments, and the supplementations of VC and VE in cells treated with H₂O₂ showed greater (p < 0.05) TEER values than the supplementations of VA, Cr, Se, and Zn in cells treated with H₂O₂. In conclusion, Thr, Trp, Gly, and VC supplements were effective in improving cell viability and intestinal barrier function of cIECs exposed to oxidative stress.

• Bulletin of the Korean Chemical Society
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• 제30권12호
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• pp.3021-3024
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• 2009

$Zn_2Ti_{1-x}Fe_xO_4\;(0\;{\leq}\;x\;{\leq}\;0.7)$ photocatalysts were synthesized by polymerized complex (PC) method and investigated for its physico-chemical as well as optical properties. $Zn_2Ti_{1-x}Fe_xO_4$ can absorb not only UV light but also visible light region due to doping of Fe in the Ti site of $Zn_2TiO_4$ lattice because of the band transition from Fe 3d to the Fe 3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped $Zn_2TiO_4$ samples for hydrogen production under UV light irradiation decreased with an increase in Fe concentration in $Zn_2TiO_4$. Consequently, there exists an optimized concentration of iron for improved photocatalytic activity under visible light (${\lambda}{\leq}$420 nm)

• 공업화학
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• 제27권2호
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• pp.153-157
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• 2016

본 연구에서는 세 가지 형태의 금속을 함유한 이온성 액체 촉매를 제조하고, 다양한 물리화학적 분석법으로 제조된 촉매의 특성분석을 실시하였다. 프로필렌 옥사이드(PO)와 이산화탄소의 부가반응을 통한 프로필렌 카보네이트(PC)의 합성반응에서 세 가지 촉매의 반응활성을 확인하였고 속도론적 연구를 통해 촉매들의 반응성 차이를 비교하였다. 세가지 금속이 다른 촉매에 대한 유사 반응속도 상수($K_{app}$)는 $(MeIm)_2ZnCl_2$, > $(MeIm)_2FeCl_2$ > $(MeIm)_2CuCl_2$의 순서이며, 이 것은 세 가지 촉매의 반응성이 $(MeIm)_2ZnCl_2$ > $(MeIm)_2FeCl_2$ > $(MeIm)_2CuCl_2$의 순서로 실험결과와 잘 일치하였다.

• 대한전자공학회논문지
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• 제11권6호
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• pp.25-32
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• 1974

먼저 ZnS분말을 공기중에서 소성하는 방법을 연구하여 EL을 제조하여 만들어진 EL의 전기광학적 실험을 하였다. 다음에 CdS를 이용하여 광도전소자를 만들고 그 전기광학적 성질을 조사하였다. 위의 두가지를 이용하여 하나의 미광증폭소자를 만들어 그 원리를 이론적으로 규명하였고 실험적으로 확인하였다. 결론적으로 우리가 세운 이론식이 2%이내의 오차한계에서 정확하였고 미광증폭기의 설계와 제작에 도움이 됨을 알았다.

• 한국염색가공학회지
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• 제14권1호
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• pp.27-33
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• 2002

The preparations of deodorizing fibers using medal-phthalocyanines have been investigated. The five metal-phthalocyanine derivatives(M-taPc, M=Fe, Co, Ni, Zn, Cu) were prepared in modest to good yields. The metal-phthalocyanine derivative as a deodorant material was introduced to fibers by a dyeing method. The deodorant activity(D.A.) of these deodorizing fibers was measured by chromogenic gas detector tubes. In comparison with untreated fibers, these deodorizing fibers was remarkably effective against $NH_3$ and CH3SH. More than 99% of ammonia can be removed within 20 min. The D.A.(%) of fiber adsorbed M-taPc was more than 80% after 90min.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 학술대회 및 기술세미나 논문집 디스플레이 광소자
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• pp.39-40
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• 2006

We prepared ZnO:Al (AZO) thin films on polycarbonate (Pc) and polyethersulfon (PES). Because the polymer substrate has weak thermal resistance. The AZO thin films were deposited at room temperature by facing targets sputtering (FTS) method In the work, AZO thin films were deposited with different thickness in 1mTorr and $O_2$ gas flow rate 0.05. The electrical, optical and crystallographic properties were measured From the results, the resistivity of $7.3{\times}10^{-4}{\Omega}cm$ and transmittance of over 80% in visible range were obtained.