• 제목/요약/키워드: OPV

검색결과 60건 처리시간 0.038초

유무인 겸용 비행체의 자동비행조종시스템 개발 (Automatic Flight Control System Development for Optionally Piloted Vehicle)

  • 이상종;최형식;성기정
    • 한국항공우주학회지
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    • 제42권11호
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    • pp.968-973
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    • 2014
  • 유무인 겸용 비행체인 OPV는 무인기 개발방법 중의 하나로 기존 유인기 운용을 통해 검증된 유인 비행체와 엔진 및 각 계통을 유지하며, 무인기 운용을 위해 필요한 부가 시스템을 장착하고, 필요에 따라 기존시스템을 수정하여 개발비용과 시간을 줄일 수 있는 장점을 가지고 있다. 또한 임무 및 비행조건에 따라 유인기와 무인기로 겸용하여 운용할 수 있는 장점을 가지고 있으며, 퇴역하는 유인기를 재활용하는 측면에서도 국가의 중요재원을 효율적으로 활용할 수 있는 시스템이다. 본 논문에서는 국내 최초로 개발한 고정익 OPV 비행체의 자동비행조종시스템을 중심으로 초기 중요 개발개념과 기술적 고려사항 들을 정리하였다.

Light Emitting Devices Based on Organic Single Crystals

  • Nakanotani, Hajime;Saito, Masatoshi;Nakamura, Hiroaki;Adachi, Chihaya
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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    • pp.342-345
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    • 2009
  • Bright light-emitting single crystal organic field-effect transistors (FETs) based on highly luminescent oligo(p-phenylenevinylene) (OPV) derivatives are demonstrated. Although OPV single crystal FETs show both p - and n - type FET operation, we found that an increase in the conjugation length of the OPV derivatives from three phenylene rings to five phenylene rings results in an improvement in the electron mobility by an order of magnitude, while retaining the high hole mobility with intense electroluminescence.

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Carbon nanomaterials in organic photovoltaic cells

  • Kim, Tae-Hoon;Yang, Seung-Jae;Park, Chong-Rae
    • Carbon letters
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    • 제12권4호
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    • pp.194-206
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    • 2011
  • Carbon nanomaterials in organic photovoltaic (OPV) cells have attracted a great deal of interest for the development of high-efficiency, flexible, and low-cost solar cells. Due to the complicated structure of OPV devices, the electrical properties and dispersion behavior of the carbon nanomaterials should be controlled carefully in order for them to be used as materials in OPV devices. In this paper, a fundamental theory of the electrical properties and dispersion behavior of carbon nanomaterials is reviewed. Based on this review, a state-of-the-art OPV device composed of carbon nanomaterials, along with issues related to such devices, are discussed.

Develpment of Textile-based Organic Solar Cell

  • 이승우;김영민;전지훈;이영훈;;최덕현
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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    • pp.460-460
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    • 2014
  • Organic photovoltaic cells (OPV) have been extensively studied due to their unique properties such as flexibility, light-weight, easy processability, cost-effectiveness, and being environmental friendly. These advantages make them an attractive candidate for application in various novel fields and promising development with new features. Photovoltaic cell-integrated textiles have greatly attractive features as a power source for the smart textile solutions, and OPV is most ideal form factor due to advantage of flexibility. In this study, we develop a textile-based OPV through various experimental methods and we suggest the direction for the design of the photovoltaic textile. We used a textile electrode and tried to various layouts for textile-based OPV. Finally, we determined the contact area by using Hertzian theory for the calculation of power conversion efficiency (PCE). Based on the results of calculation, the short circuit current density, Isc, was $13.11mA/cm^2$ under AM 1.5condition and the PCE was around 2.5%.

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Post Silicon Management of On-Package Variation Induced 3D Clock Skew

  • Kim, Tak-Yung;Kim, Tae-Whan
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제12권2호
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    • pp.139-149
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    • 2012
  • A 3D stacked IC is made by multiple dies (possibly) with heterogeneous process technologies. Therefore, die-to-die variation in 2D chips renders on-package variation (OPV) in a 3D chip. In spite of the different variation effect in 3D chips, generally, 3D die stacking can produce high yield due to the smaller individual die area and the averaging effect of variation on data path. However, 3D clock network can experience unintended huge clock skew due to the different clock propagation routes on multiple stacked dies. In this paper, we analyze the on-package variation effect on 3D clock networks and show the necessity of a post silicon management method such as body biasing technique for the OPV induced 3D clock skew control in 3D stacked IC designs. Then, we present a parametric yield improvement method to mitigate the OPV induced 3D clock skew.

스프레이 박막 코팅을 이용한 OPV제작

  • 김정수;김동수;조정대;김인영
    • 기계와재료
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    • 제22권3호
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    • pp.6-13
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    • 2010
  • 최근 신재생에너지, 녹색성장분야의 연구는 미래 산업의 핵심 기술로 평가되고 있다. 특히나 태양전지 분야는 미래 대체 에너지 기술로써 크게 각광 받고 있으며 과거 실리콘 기반의 전력 생산용 태양전기 기술이 주가 되었지만 근래에는 모바일 기기의 보조 전력, 스마트 윈도우 등 다양한 산업에 적용 가능한 박막 태양전지 기술이 급속도로 발전을 하고 있다. 현재 박막 태양전지 기술은 아직까지도 산업화 기술에 근접하지 못하고 있지만 향후 5년이내에는 다양한 형태로 산업화가 이루어 질 것으로 예측하고 있다. 따라서 본 논문에서는 박막형 태양전지 중의 하나인 OPV태양전지의 산업화 적용을 위해 스프레이 공정 기술과 이를 이용하여 OPV 소자를 제작한 내용에 대해 기술했다.

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대면적 유기 태양 전지의 제작 (Fabrication of large area OPV cells)

  • 변원배;신원석;류가연;박혜성;문상진
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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    • pp.69.2-69.2
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    • 2010
  • Recently, bulk hetero-junction cells have been extensively studied by many researchers. Most of these cells were fabricated by spin coater. However, the spin coating process is not favorable to the large-scaled industry because it is not compatible with roll-to-roll process. One of the alternative methods is Doctor blading. In this study, we fabricated large OPV cells having total area of $100cm^2$. The buffer layer was Poly-(3,4-ethylenedioxythiophene) : poly-(styrenesulfonate) aqueous dispersion (PEDOT:PSS) and the active material is poly (3-hexythiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) blend in the solvent of Chlorobenzene. All of the organic layers were coated by dragging the blade with a speed of 5~20 mm/s on the stage with a temperature of $50^{\circ}C$. As-bladed PEDOT:PSS layer was baked at $120^{\circ}C$ for 10 minutes to eliminate the water. The cell structure is patterned ITO substrate/PEDOT:PSS/P3HT:PCBM/LiF/Al. The topmost electrode, LiF/Al, was deposited by thermal evaporation. After depositing electrode, and the cell was annealed at $150^{\circ}C$ for 30 minutes. The measured ISC, VOC, fill factor, and PCE were 2.95 A, 5.86 V, 0.32, and 0.78%, respectively. PCE was quite low but the large active area could be obtained successfully.

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Development of Simple Solvent Treating Methods to Enhance the Efficiency of Small-Molecule Organic Solar Cells

  • Kim, Jin-Hyun;Heo, Il-Su;Gong, Hye-Jin;Yu, Yeon-Gyu;Yim, Sang-Gyu
    • 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.

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Enhanced Stability of Organic Photovoltaics by Additional ZnO Layers on Rippled ZnO Electron-collecting Layer using Atomic Layer Deposition

  • Kim, Kwang-Dae;Lim, Dong Chan;Jeong, Myung-Geun;Seo, Hyun Ook;Seo, Bo Yeol;Lee, Joo Yul;Song, Youngsup;Cho, Shinuk;Lim, Jae-Hong;Kim, Young Dok
    • Bulletin of the Korean Chemical Society
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    • 제35권2호
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    • pp.353-356
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    • 2014
  • We fabricated organic photovoltaic (OPV) based on ZnO ripple structure on indium tin oxide as electron-collecting layers and PTB7-F20 as donor polymer. In addition, atomic layer deposition (ALD) was used for preparing additional ZnO layers on rippled ZnO. Addition of 2 nm-thick ALD-ZnO resulted in enhanced initial OPV performance and stability. Based on photoluminescence results, we suggest that ALD-ZnO layers reduced number of surface defect sites on ZnO, which can act as electron-hole recombination center of OPV, and increased resistance of ZnO towards surface defect formation.