• 제목/요약/키워드: Solar Energy Conversion Efficiency

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$TiO_2$ 나노파이퍼를 첨가한 염료감응형 태양전지의 전기화학적 특성 (Electrochemical Characteristics of added $TiO_2$ Nanofiber for Dye-Sensitized Solar Cells)

  • ;박경희;구할본
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.243-244
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    • 2009
  • The $TiO_2$ nanofiber doped $TiO_2$ electrode area applied to dye-sensitized solar cells(DSSCs). The mixtures of $TiO_2$ nanofiber to $TiO_2$ photoelectrode has larger surface area than $TiO_2$ photoelectrode. In this research added 2.5, 5 and 10wt% $TiO_2$ nanofibers and the optimum condition of 5 wt% $TiO_2$ nanofiber's high surface area contributing the improvement of short-circuit photocurrent. The open-circuit voltage was 0.7V and solar energy conversion efficiency was 5.4%.

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$Ta_2O_5/Al/SiO_2/P-Si$ MIS형(形) 태양전지(太陽電池)의 제작(製作)과 특성(特性) (Fabrication and Characteristics of $Ta_2O_5/Al/SiO_2/p-Si$ MIS Solar Cells)

  • 노경석;손연규
    • 태양에너지
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    • 제6권2호
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    • pp.70-75
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    • 1986
  • The fabrication procedure and characteristics of $Ta_2O_5/Al/SiO_2/p-Si$ MIS solar cells forming a fine grating pattern of aluminum evaporated on to p-type silicon crystal are discribed. The proper temperature for oxide growing of these cells was found to be about $450^{\circ}C$ for 20 minutes with oxygen flow. The conversion efficiency increased about 3% after $750{\AA}$ thickness of tantalium silica film spin on anti-reflective coating. The best results showed that $V_{oc}=0.545V,\;J_{sc}=34mA$ and F.F = 0.65, which represent that the conversion efficiency is 12%.

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MOCVD를 이용한 GAs/Si 태양전지의 제작과 특성에 관한 연구 (A Study on Fabrication and Properties of the GaAs/Si Solar Cell Using MOCVD)

  • 차인수;이만근
    • 태양에너지
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    • 제18권3호
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    • pp.137-146
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    • 1998
  • In this paper, the current status of manufacturing technologies for GaAs/Si solar cell were revived and provied new MOCVD. In the manufacturing process of GaAs/Si solar cells and an experiment to get the high efficiency GaAs solar cells, we must investigate the optimum growth conditions to get high quality GaAs films on Si substrates by MOCVD. The GaAs on Si substrates has been recognized as a lightweight alternative to pure substrate for space applicaton. Because its density is less the half of GaAs or Ge.So GaAs/Si has twofold weight advantage to GaAs monolithic cell. The theoretical conversion efficiecy limit of tandem GaAs/Si solar cell is 32% under AM 0 and $25^{\circ}C$ condition. It was concluded that the development of cost effective MOCVD technologies shoud be ahead GaAs solar cells for achived move high efficiency III-V solar cells involving tandem structure.

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태양열 온수 시스템에 적용 가능한 100 W급 열전발전 모듈 성능에 관한 연구 (A Study on the Performance of 100 W Thermoelectric Power Generation Module for Solar Hot Water System)

  • 서호영;이경원;윤정훈;이순환
    • 한국태양에너지학회 논문집
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    • 제39권1호
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    • pp.21-32
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    • 2019
  • Solar hot water system produces hot water using solar energy. If it is not used effectively, overheating occurs during the summer. Therefore, a lot of research is being done to solve this. This study develops thermoelectric power module applicable to solar hot water system. A thermoelectric material can directly convert thermal energy into electrical energy without additional power generation devices. If there is a temperature difference between high and low temperature, it generate power by Seebeck effect. The thermoelectric module generates electricity using temperature differences through the heat exchange of hot and cold water. The water used for cooling is heated and stored as hot water as it passes through the module. It can prevent overheating of Solar hot water system while producing power. The thermoelectric module consists of one absorption and two radiation part. There path is designed in the form of a water jacket. As a result, a temperature of the absorption part was $134.2^{\circ}C$ and the radiation part was $48.6^{\circ}C$. The temperature difference between the absorption and radiation was $85.6^{\circ}C$. Also, The Thermoelectric module produced about 122 W of irradiation at $708W/m^2$. At this time, power generation efficiency was 2.62% and hot water conversion efficiency was 62.46%.

광합성 전자 추출 기반 바이오 태양광 에너지 전환기술 동향 (Trends of Photosynthetic Bio-solar Energy Conversion Technology)

  • 김용재;홍현욱;신혜인;윤재형;류원형
    • 세라미스트
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    • 제21권3호
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    • pp.233-248
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    • 2018
  • Photosynthesis of plant, algae, and certain types of bacteria can convert solar energy to electrons at high efficiency. There have been many research investigations to utilize this mechanism to develop photosynthetic bio-solar energy systems. In this article, the fundamentals of photosynthetic energy conversion mechanism are explained and various approaches are introduced and discussed.

Synthesis of Zr-incorporated TiO2 Using a Solvothermal Method and its Photovoltaic Efficiency on Dye-sensitized Solar Cells

  • Kim, Su-Jung;Kang, Mi-Sook
    • Bulletin of the Korean Chemical Society
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    • 제32권9호
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    • pp.3317-3322
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    • 2011
  • This study examines the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) when nanometer-sized Zr (0.1, 0.5, and 1.0 mol %)-$TiO_2$ prepared using a solvothermal method is utilized as the working electrode material. The particle sizes observe in the transmission electron microscopy (TEM) images are < 30 nm in all samples. The absorption band is slightly broadened at the tail for the 0.1 mol % Zr-$TiO_2$, and the intensity of the photoluminescence (PL) curves of the Zr-incorporated $TiO_2$ is significantly smaller than that of the pure $TiO_2$. Compared to that using pure $TiO_2$, the energy conversion efficiency is enhanced considerably by the application of Zr-$TiO_2$ in the DSSCs to approximately 6.17% for 0.5 mol % Zr-$TiO_2$ with the N719 dye (10.0 ${\mu}m$ film thickness and 5.0 mm ${\times}$ 5.0 mm cell area) under 100 mW/$cm^2$ of simulated sunlight.

Enhancement of Photocurrent Efficiency in Dye-sensitized Solar Cells Using Nanometer-sized Y-incorporated TiO2 Materials

  • Kim, Su-Jung;Yeo, Min-Kyeong;Um, Myeong-Heon;Kang, Mi-Sook
    • Bulletin of the Korean Chemical Society
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    • 제33권4호
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    • pp.1220-1224
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    • 2012
  • This study examines the photoelectric conversion efficiency of dye-sensitized solar cells (DSSCs) when nanometer-sized Y (0, 0.1, 0.5, and 1.0 mol %)-incorporated $TiO_2$ prepared using a solvothermal method is utilized as the working electrode material. The photoelectric properties of the Y-$TiO_2$ used in DSSCs were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopy. The recombination was much slower in the Y-$TiO_2$-based DSSCs than in the pure $TiO_2$-assembled DSSC. Compared to that using pure $TiO_2$, the energy conversion efficiency was enhanced considerably by the application of Y-$TiO_2$ in the DSSCs to approximately 6.08% for 0.5 mol % Y-$TiO_2$.

F$\ddot{o}$rst energy transfer 를 적용한 준고체 DSSC 의 효율향상 (Enhanced Light Harvesting from F$\ddot{o}$rst-type resonance Energy Transfer in the Quasi-Solid State Dye-Sensitized Solar Cells)

  • 천종훈;이정관;양현석;김재홍
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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    • pp.117.1-117.1
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    • 2011
  • We have demonstrated Forst-type resonance energy transfer (FRET) in the quasi-solid type dye-sensitized solar cells between organic fluorescence materials as an energy donor doped in polymeric gel electrolyte and ruthenium complex as an energy acceptor on surface of $TiO_2$. The strong spectral overlap of emission/absorption of energy donor and acceptor is required to get high FRET efficiency. The judicious choice of energy donor allows the enhancement of light harvesting characters of energy acceptor in quasi-solid dye sensitized solar cells which increase the power conversion efficiency. The enhanced light harvesting effect by the judicious choice/design of the fluorescence materials and sensitizing dyes permits the enhancement of photovoltaic performance of DSSC.

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지향성 에너지를 이용한 고고도 장기체공 태양광 무인항공기 운용 개념 연구 (A Study on Operational Concept of Solar Powered HALE UAV Using Directed-Energy)

  • 안효정
    • 신재생에너지
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    • 제7권3호
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    • pp.59-66
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    • 2011
  • Recently, an UAV using green energy for propulsion has been developed due to exhaustion of fossil fuel. This aircraft runs on electric motors rather than internal combustion engines, with electricity coming from fuel cells, solar cells, ultracapacitors, and/or batteries. Especially solar cells are installed in HALE UAV and flight tests are performed in the stratosphere. Although the solar powered UAV has the advantage of zero emission, its energy conversion efficiency is low and operation time is limited. Therefore, the solar powered UAV has been designed to operate with the secondary battery obtaining flexibility of energy management. In this study, we suggest the new operational concept of the solar powered UAV using directed-energy rayed from the surface of earth to UAV. An UAV is able to secure additional power through attaching solar cell to the lower surface of elevator. As a result, the additional energy supplied by directed-energy can improve the energy management and operational flexibility of the solar powered UAV.

스퍼터링에 의한 CdTe 박막 제조 조건이 CdTe/CdS 태양전지의 특성에 미치는 영향 (Effect of Sputtering Conditions for CdTe Thin Films on CdTe/CdS Solar Cell Characteristics)

  • 정해원;이천;신재혁;신성호;박광자
    • E2M - 전기 전자와 첨단 소재
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    • 제10권9호
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    • pp.930-937
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    • 1997
  • Polycrystalline CdTe thin films have been studied for photovoltaic application because of their high absorption coefficient and optimal band energy(1.45 eV) for solar energy conversion. In this study CdTe thin films were deposited on CdS(chemical bath deposition)/ITO(indium tin oxide) substrate by rf-magnetron sputtering under various conditions. Structural optical and electrical properties are investigated with XRD UV-Visible spectrophotometer SEM and solar simulator respectively. The fabricated CdTe/CdS solar cell exhibited open circuit voltage( $V_{oc}$ ) of 610 mV short circuit current density( $J_{sc}$ ) of 17.2 mA/c $m^2$and conversion efficiency of about 5% at optimal sputtering conditions.

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