• Title/Summary/Keyword: Solar cell

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Design analysis of high efficiency crystalline silicon solar cell using the selective emitter (선택적 에미터를 적용한 고효율 결정질 실리콘 태양전지 구조 설계)

  • Lim, Jong-Keun;Lee, Won-Jae;Moon, In-Sik;Oh, Hoon;Cho, Eun-Chel
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.355-358
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    • 2009
  • This paper presents the technology of selective emitter for high efficiency crystalline silicon solar cell. The effect of selective emitter is analyzed by using the simulation program for solar cell, PC1D. The selective emitter shows better spectral response in short wavelength regions compared to homogeneous emitter. Therefore, the efficiency of solar cell with selective emitter can be improved by changing the sheet resistance from 60 $\Omega/\square$ to 120 $\Omega/\square$. In addition, the power loss of solar cell can be minimized by optimizing width and gap of the finger electrodes on the selective emitter.

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Analysis of the Electrical Properties of Solar Cell According to Variation of the Frequency (주파수 변화에 따른 태양전지 전기적 특성 분석)

  • Kim, Seong-Geol;Hong, Chang-Woo;Lee, Kyung-Sup
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.5
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    • pp.372-376
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    • 2012
  • This study focused on the performance characteristics of solar cell using the impedance technique. We measured an impedance according to frequency from 1 Hz until 1 MHz. It could know that the impedance was decreased according to the frequency increases in solar cell. The impedance of single crystal solar cell was 0.61 ${\Omega}$ at 1 Hz, and kept almost settled value to $1{\times}10^2$ Hz. However, the impedance of polycrystal solar cell was $7{\times}10^3{\Omega}$ at 1 Hz.

Analysis of improved solar cell modeling (개선된 태양전지 모델링 해석)

  • Kim Sun-Ja;Jeong Byung-Hwan;Park Jong-Chan;Choe Gyu-Ha
    • Proceedings of the KIPE Conference
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    • 2004.07a
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    • pp.113-116
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    • 2004
  • Output power of a photovoltaic system changes continuously as it strongly depends on the weather condition(isolation and temperature). Therefore, it is necessary the theoretical model realizes the electrical output characteristics of solar cell. Of several theoretical models for real solar cell, both parametric model and interpolation model are used widely. In this paper, we have propose a improved model of solar cell using its output characteristics that can be extended to calculate the rear solar cell characteristics at various temperatures and insolation. And more, the theoretical research of several models of solar cell using simulation analysis.

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Maximum power tracking Strategy of a Solar Cell using ZVCS converter (ZVCS 컨버터를 이용한 태양전지 최대전력 검출법)

  • Kwak, Dong-Kurl;Jun, Hyun-Kyu;Kim, Jong-Min;Lee, Hyun-Woo
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1032-1034
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    • 2001
  • As well known, a solar cell has an optimal operating point to be able to get the maximum power $P_{max}$. So, many $P_{max}$ tracking controllers using the line voltage of a solar cell have been popularly used. But it may vary depending on the miss match between the solar cell output and the load. In this paper, we investigate the possibilities of $P_{max}$ control using the current tracking controller and the output voltage and the output current instead of the solar cell output power. And we also examine about the optimal power converter using ZVCS step up and down chopper circuit to operate the solar cell at an optimal voltage using these variables. And then, we show some experimental results to confirm the successful operation.

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A Stand-alone Source System using the Solar cell (태양전지를 이용한 독립형 전원시스템)

  • Lee, Jeong-Joon;Jho, Jeong-Min;Sung, Nark-Kuy;Lee, Seung-Hwan;Oh, Bong-Hwan;Han, Kyung-Hee
    • Proceedings of the KIEE Conference
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    • 1999.07f
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    • pp.2565-2567
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    • 1999
  • The output characteristics of solar cell vary with load and solar insolation. Therefore solar cell must always track maximum power point. If photovoltaic system is stand-alone. It is necessary to maintain for output of voltage source inverter. In this paper, stand-alone photovoltaic system consists of boost chopper and voltage source inverter. We make it to track maximum power point by revolution of solar cell array instead of detecting situation of sun in any conditions. And we prove that maximum power point tracking by revolution of solar cell array is better than fixed solar cell.

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A Study on the Solar Cell Charging Equipment for Hybrid Vehicle (Hybrid 자동차용 Solar Cell 충전장치에 관한 연구)

  • Kim, G.S.;Park, S.C.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.4
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    • pp.157-164
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    • 2011
  • Hybrid car can improve fuel efficiency using a power of motor that is generated during constant-speed or deceleration driving. The motor is located between engine and transmission. But, when voltage of main battery is low, fuel efficiency is low because the voltage can't run the motor. In this situation, this study observed fuel efficiency when using solar cell for assistance power. In order to verify a fuel consumption of hybrid car equipped solar cell for assistance power, the car was tested downtown driving. As hybrid car was equipped solar cell for assistance, fuel consumption was reduced 8.35 % at running air conditioner. And, at air conditioner doesn't work, fuel consumption was reduced 6.88 %. This point of view, CO2 is expected to reduce in similar proportion.

Recent Development Status of Organic Solar Cells (유기태양전지의 개발현황)

  • Pang, Chang-Hyun;Park, Keun-Hee;Jung, Dong-Geun;Chae, Hee-Yeop
    • Journal of the Korean Vacuum Society
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    • v.16 no.3
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    • pp.167-171
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    • 2007
  • Currently, the alternative energy is one of the critical issues because of exhaustion of petroleum resources and its high cost. The solar cell is considered as the one of the promising alternative energy. And the solar cell can be classified to inorganic solar cell and organic solar cell. Although the efficiency of organic solar cell is very lower than the that of inorganic solar cell, organic solar cells have many advantages including low process cost, high transmittance, color variation, and flexibility. For these reasons, organic solar cells have the potential in low cost solar cell market that is challenging for inorganic solar cells. Recent researches of organic solar cell is concentrating on enhancement of efficiency, lifetime, and stability to order to commercially use. Working principles and the development issues of organic solar cells are discussed in this paper.

Fabrication of Multi-crystalline Silicon Solar Cell by using Wafer Adhesion Texturing Method (웨이퍼 접착 텍스쳐링 방식을 이용한 다결정 실리콘 태양전지 제조)

  • Yoon, Seok-Il;Roh, Si-Cheol;Choi, Jeong- Ho;Jung, Jong-Dae;Seo, Hwa-Il
    • Journal of the Semiconductor & Display Technology
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    • v.15 no.4
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    • pp.67-72
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    • 2016
  • In this study, the texturing and the emitter formation processes were carried out with the wafer adhesion method to increase the productivity and reduce the production cost of the multi-crystalline silicon solar cell. After fabricating $156{\times}156mm$ solar cell according to the wafer adhesion method, the operation characteristics were analyzed and compared with those of the solar cell fabricated by the standard process method. In the case of a solar cell formed by the wafer adhesion method, it showed Jsc of $32.87mA/cm^2$, Voc of 0.612V, FF of 78.04% and efficiency of 15.71% respectively. The efficiency of the solar cell formed by the wafer adhesion method was 0.1% higher than that of the solar cell formed by the standard method. In addition, the productivity of the texturing and the emitter formation processes is expected to be approximately doubled. Therefore, it is expected that the manufacturing cost of the multi-crystalline solar cell can be reduced due to the improved productivity compared with the standard process.

Advances in Crystalline Silicon Solar Cell Technology

  • Lee, Hae-Seok;Park, Hyomin;Kim, Donghwan;Kang, Yoonmook
    • Proceedings of the Korean Vacuum Society Conference
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    • 2015.08a
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    • pp.82-82
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    • 2015
  • Industrial crystalline silicon (c-Si) solar cells with using a screen printing technology share the global market over 90% and they will continue to be the same for at least the next decade. It seems that the $2^{nd}$ generation and the $3^{rd}$ generation technologies have not yet demonstrated competitiveness in terms of performance and cost. In 2014, new world record efficiency 25.6% (Area-$143.7cm^2$, Voc-0.740V, $Jsc-41.8mA/cm^2$, FF-0.827) was announced from Panasonic and its cell structure is Back Contact $HIT^*$ c-Si solar cell. Here, amorphous silicon passivated contacts were newly applied to back contact solar cell. On the other hand, 24.9% $TOPCon^{**}$ cell was announced from Fraunhofer ISE and its key technology is an excellent passivation quality applying tunnel oxide (<2 nm) between metal and silicon or emitter and base. As a result, to realize high efficiency, high functional technologies are quite required to overcome a theoretical limitation of c-Si solar cell efficiency. In this presentation, Si solar cell technology summarized in the International Technology Roadmap for Photovoltaics ($^{***}ITRPV$ 2014) is introduced, and the present status of R&D associated with various c-Si solar cell technologies will be reviewed. In addition, national R&D projects of c-Si solar cells to be performed by Korea University are shown briefly.

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CHARACTERISTICS OF LOW-TEMPERATURE PROCESSED DYE-SENSITIZED SOLAR CELL BY ELECTROCHEMICAL IMPEDANCE AND PHOTOCURRENT-PHOTOVOLTAGE TRANSIENT SPECTROSCOPY

  • Li, Yuelong;Lee, Doh-Kwon;Kim, Kyung-Kon;Ko, Min-Jae
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.381-381
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    • 2011
  • In this study, a TiO2 colloidal sol was synthesized by sol-gel process, which was used as a "glue" agent to enhance interconnection of TiO2 particles in low temperature process for plastic dye sensitized solar cell. The crystalline phase of this TiO2 glue is pure anatase with average particles size of 5 nm, which was characterized by powder X-ray diffraction and high revolution-TEM. The viscous alcoholic paste without any organic binder was prepared from the mixture of commercial P25 powder and glue. Paste composition and sintering process parameters were optimized for high photovoltaic performance based on low temperature process. The electrochemical impedance spectroscopy and photocurrent-photovoltage transient spectroscopy were also employed to investigate the mechanism of electron transport in this binder free TiO2 film system.

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