• Title/Summary/Keyword: Solar cell

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A Study on Analysis of Solar Cell Characteristics Using EMTP (EMTP를 이용한 Solar Cell 특성 분석에 관한 연구)

  • Cho, Hae-In;Yeo, Sang-Min;Kim, Chul-Hwan
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.213-214
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    • 2008
  • 최근 태양광 발전을 전력계통에 연계하는 연구가 많이 진행되고 있다. 태양광 발전 시스템은 조사량과 온도의 변화와 같은 환경요인에 의해 출력 특성이 달라지므로 이에 대한 연구와 계통에 미치는 영향 분석이 필요하다. 본 논문에서는 EMTP/MODELS를 사용하여 태양전지 내부 손실, 조사강도, 온도 조건을 고려한 Solar Cell의 특성을 구현하고 분석하였다. 또한 실제 Solar Cell 데이터와 비교하여 타당성을 검증하였다.

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A study on Electrical Characteristics of Solar Cell - Wind Generator Hybrid system (태양광, 풍력발전 하이브리드시스템의 전기적 특성)

  • Hong, Chang-Woo;Choi, Young-Sung;Lee, Kyung-Sup
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.25-25
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    • 2010
  • In this paper, we have investigated the electrical characteristics for solar-cell and wind power generator hybrid system. The output of electricity for solar cell - wind generator hybrid system were investigated according to the weather conditions at Naju province.

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The effect of rear side etching for crystalline Si solar cells (후면식각이 결정질 실리콘 태양전지에 미치는 영향에 관한 연구)

  • Shin, Jeong Hyun;Kim, Sun Hee;Lee, Hongjae;Kim, Bum Sung;Lee, Don Hee
    • 한국신재생에너지학회:학술대회논문집
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    • 2010.06a
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    • pp.72.2-72.2
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    • 2010
  • Nowadays, the crystalline Si Solar cell are expected for economical renewable energy source. The cost of the crystalline Si solar cell are decreasing by improvement of its efficiency and decrease of the cost of the raw Si wafers for Solar cells. This Si wafer based crystalline Si solar cell is the verified technology from several decade of its history. Now, I will introduce one method that can be upgrade the efficiency by using simple and economical method. The name of this method is Rear Side Etching(RSE). The purpose of rear side etching is the elimination of n+ layer of rear side and increase of the flatness. The effects of rear side etching are the improvement of Voc and increase of efficiency by reducement series resistance and forming of uniform BSF. The experimental procedure for rear side etching is very simple. After anti-reflection coating on solar cell wafer, Solar cell wafer is etched by the etching chemical that react with only rear side not front side. This special chemical is no harmful to anti-reflection coating layer. It can only etched rear side of solar cell wafer. We can use etching image by optical microscope, minority carrier life time by WCT 120, SiNx thickness and refractive index by ellipsometer, cell efficiency for the RSE effect measurement. The key point of rear side etching is development of etching process condition that react with only rear side. If we can control this factor, we can achieve increase of solar cell efficiency very economically without new device.

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Rear Surface Passivation with Al2O3 Layer by Reactive Magnetron Sputtering for High-Efficiency Silicon Solar Cell

  • Moon, Sun-Woo;Kim, Eun-Kyeom;Park, Won-Woong;Jeon, Jun-Hong;Choi, Jin-Young;Kim, Dong-Hwan;Han, Seung-Hee
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.211-211
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    • 2012
  • The electrical loss of the photo-generated carriers is dominated by the recombination at the metal- semiconductor interface. In order to enhance the performance of the solar cells, many studies have been performed on the surface treatment with passivation layer like SiN, SiO2, Al2O3, and a-Si:H. In this work, Al2O3 thin films were investigated to reduce recombination at surface. The Al2O3 thin films have two advantages, such as good passivation properties and back surface field (BSF) effect at rear surface. It is usually deposited by atomic layer deposition (ALD) technique. However, ALD process is a very expensive process and it has rather low deposition rate. In this study, the ICP-assisted reactive magnetron sputtering method was used to deposit Al2O3 thin films. For optimization of the properties of the Al2O3 thin film, various fabrication conditions were controlled, such as ICP RF power, substrate bias voltage and deposition temperature, and argon to oxygen ratio. Chemical states and atomic concentration ratio were analyzed by x-ray photoelectron spectroscopy (XPS). In order to investigate the electrical properties, Al/(Al2O3 or SiO2,/Al2O3)/Si (MIS) devices were fabricated and characterized using the C-V measurement technique (HP 4284A). The detailed characteristics of the Al2O3 passivation thin films manufactured by ICP-assisted reactive magnetron sputtering technique will be shown and discussed.

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Output Power Characteristics of CPV Solar Cell due to Non-uniform Illumination (고집광 태양전지의 비균등 조사에 의한 출력특성)

  • Shin, Goo-Hwan;Ryu, Kwang-Sun;Cha, Won-Ho;Myung, Noh-Hoon;Kim, Young-Sik;Kang, Gi-Hwaw
    • 한국태양에너지학회:학술대회논문집
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    • 2011.04a
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    • pp.269-274
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    • 2011
  • A solar cell is primary parts to produce electrical energy from the Sun. And, we can utilize those solar cells as a power generation system in home, factory, and so on. In order to make proper power, the solar cells are configured in series and parallel lay down. In condition of uniform illumination, the solar array will produce an enough power by photovoltaic effects from the solar cells. In case of non-uniform illumination on the solar cells, the power will be dramatically decreased compared to design. Fortunately, there were so many research outputs regarding the illumination effects on solar array. In this work, we tried to find out the non-uniform effects on unit CPV solar cell, because there were no research outputs for unit CPV solar cell considering illumination. The CPV solar cell was used in CPV system to make a power by the Sun. We chosen the triple junction solar cell of GaAsInP2Ge for simulation, which has a 30 % of conversion efficiency. By simulation, we obtained the output performance of CPV solar cells in condition of various illumination by using Hamming Window function. Its performance was degraded by 10 % to 50 % depending illumination conditions.

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A Study on Verifying the Validity of a Solar Cell System Following Sunlight in the Horizontal Direction for Aid to Navigation (태양광원에 대한 수평방향 추적식 항로표지용 태양전지 시스템의 도입 타당성에 관한 연구)

  • Jeon, Joong-Sung;Kim, Jung-Hun;Lee, Yong-Han
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2009.06a
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    • pp.414-418
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    • 2009
  • In this paper, a solar power tracking method using the solar cells is proposed, which has 3 solar cell located at an interval of $60^{\circ}$ in azimuth so that the sunlight may almost be perpendicular to the solar cells without excessive mechanical operation. Compared with the solar cell voltages in each azimuth, there is the highest voltage in time interval. As a results, this solar cell system achieve higher relative efficiency of $1.6{\sim}11.5%$ than fixed solar cell system. Therefore, it is verifying that this solar cell tracking system obtain more relative efficiency than fixed solar cell system for aid to navigation.

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Structure and Characteristics of Tandem Solar Cell Composed of Dye-sensitized Solar Cell and Thermoelectric Generator (염료감응형 태양전지와 열전발전소자를 결합한 복합 태양전지의 구조 및 특성)

  • Lee, Dong-Yoon;Song, Jae-Sung;Lee, Won-Jae;Kim, In-Sung;Jeong, Soon-Jong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.4
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    • pp.357-362
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    • 2005
  • The tandem solar cell composed of a dye-sensitized solar cell (DSC) and a thermoelectric generator (TEG) was designed. In such new cell, the characteristics of DSC and TEG were investigated. DSC uses the wavelength range of 380∼750 nm and has the maximum efficiency of below 10 %. If the solar light transmitted through DSC can be converted to heat energy, TEG can generate electric energy using this heat energy. By this means, it is possible to utilize most of solar energy in the wavelength range of 350∼3000 nm for electric generation and it can be expected to obtain higher solar energy conversion efficiency exceeding the known limit of maximum efficiency. For this purpose we suggest the tandem solar cell constructed with DSC and TEG. In this structure, DSC has a carbon nanotube film as a counter electrode of DSC in order to collect the solar light and convert it to heat energy. We measured the I-V characteristics of DSC and TEG, assembled to the tandem cell. As a result, it was shown that DSC with carbon nanotube and TEG had the efficiency of 9.1 % and 6.2 %, respectively. From this results, it is expected that the tandem solar cell of the new design has the possibility of enhanced conversion efficiency to exceed above 15 %.

Change of I-V Properties of Flexible CZTS Solar Cell Through Mechanical Bending Test (굽힘 시험에 의한 플렉시블 CZTS 태양전지의 I-V 특성 변화에 관한 연구)

  • Kim, Sungjun;Kim, Jeha
    • Journal of the Korea Convergence Society
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    • v.13 no.3
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    • pp.197-202
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    • 2022
  • The CZTS solar cell is a thin film solar cell using an absorption layer composed of Cu, Zn, Sn, Se, and S, and is cheaper than a CIGS solar cell using In and Ga and more eco-friendly than a perovskite and CdTe solar cell using Pb and Cd. In this study, we conducted a bending test for flexible CZTS solar cells. Experiments were conducted in the direction of inner benidng with compressive stress and outer bending with tensile stress, and during the number of bending 1,000 times with a radius of curvature of 50 mmR, the efficiency of the solar cell decreased by up to 12.7%, and the biggest cause of efficiency reduction in both directions was a large decrease in parallel resistance.

Photovoltaic Performance of Crystalline Silicon Recovered from Solar Cell Using Various Chemical Concentrations in a Multi-Stage Process (습식 화학 공정에 의한 태양전지로부터 고순도 실리콘 회수 및 이를 이용한 태양전지 재제조)

  • Noh, Min-Ho;Lee, Jun-Kyu;Ahn, Young-Soo;Yeo, Jeong-Gu;Lee, Jin-Seok;Kang, Gi-Hwan;Cho, Churl-Hee
    • Korean Journal of Materials Research
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    • v.29 no.11
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    • pp.697-702
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    • 2019
  • In this study, using a wet chemical process, we evaluate the effectiveness of different solution concentrations in removing layers from a solar cell, which is necessary for recovery of high-purity silicon. A 4-step wet etching process is applied to a 6-inch back surface field(BSF) solar cell. The metal electrode is removed in the first and second steps of the process, and the anti-reflection coating(ARC) is removed in the third step. In the fourth step, high purity silicon is recovered by simultaneously removing the emitter and the BSF layer from the solar cell. It is confirmed by inductively coupled plasma mass spectroscopy(ICP-MS) and secondary ion mass spectroscopy(SIMS) analyses that the effectiveness of layer removal increases with increasing chemical concentrations. The purity of silicon recovered through the process, using the optimal concentration for each process, is analyzed using inductively coupled plasma atomic emission spectroscopy(ICP-AES). In addition, the silicon wafer is recovered through optimum etching conditions for silicon recovery, and the solar cell is remanufactured using this recovered silicon wafer. The efficiency of the remanufactured solar cell is very similar to that of a commercial wafer-based solar cell, and sufficient for use in the PV industry.

Characterization ion of Solar Cells (태양전지의 효율측정)

  • 조영현;조은철;이수홍
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1995.05a
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    • pp.163-166
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    • 1995
  • A solar cell I-V (current-voltage) characteristic measurement facility is crucial, for the characteristic of solar cells, The solar cell I-v tester has been designed and fabricated to characterize the solar cell at SAIT.

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