• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.772-776
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• 2011

개발 중인 중형 전기추진 무인기는 전력원으로 태양전지, 연료전지, 이차전지를 사용한다. 전력변환기 및 컨버터를 없이 전압 매칭을 통해 전력원을 선정하고 단품시험을 수행하였다. 여러 종류의 전력원을 통합하여 사용함에 따른 각 전력원 별 특성파악 및 에너지 사용 비율을 정량적으로 평가하기 위해 5시간 지상통합시험을 수행하였다. 그 결과 배터리는 시동 및 과도상태에서 다른 동력원에 비해 빠른 출력반응을 보였으며, 연료전지와 태양전지는 순항영역에서 주 전력 공급원의 역할을 수행함을 확인하였다. 사용한 에너지 비율은 연료전지, 태양전지, 배터리가 각각 68%, 29%, 2.5%임을 알 수 있었다.

• ETRI Journal
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• 제39권6호
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• pp.859-865
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• 2017

This paper presents a method for determining the optimum active-area width (OAW) of solar cells in a module architecture. The current density-voltage curve of a reference cell with a narrow active-area width is used to reproduce the current density profile in the test cell whose active area width is to be optimized. We obtained self-consistent current density and electric potential profiles from iterative calculations of both properties, considering the distributed resistance of the contact layers. Further, we determined the OAW that yields the maximum efficiency by calculating efficiency as a function of the active-area width. The proposed method can be applied to the design of the active area of a dye-sensitized solar cell in Z-type series connection modules for indoor and building-integrated photovoltaic systems. Our calculations predicted that OAW increases as the sheet resistances of the contact layers and the intensity of light decrease.

• Journal of Power Electronics
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• 제14권6호
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• pp.1281-1292
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• 2014

Photovoltaic (PV) solar systems with series-connected module integrated converters (MICs) are receiving increased attention because of their ability to create high output voltage while performing local maximum power point tracking (MPPT) control for individual solar panels, which is a solution for partial shading effects in PV systems at panel level. To eliminate the partial shading effects in PV system more effectively, sub-MICs are utilized at the cell level or grouped cell level within a PV solar panel. This study presents the results of a series-output-connection MPPT (SOC-MPPT) controller for sub-MIC architecture using a single sensor at the output and a single digital MPPT controller (sub-MIC SOC-MPPT controller and architecture). The sub-MIC SOC-MPPT controller and architecture are investigated based on boost type sub-MICs. Experimental results under steady-state and transient conditions are presented to verify the performance of the controller and the effectiveness of the architecture.

• 한국디지털건축인테리어학회논문집
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• 제12권3호
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• pp.5-13
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• 2012

In this study, features and design effects of PV(Photovoltaic) modules were classified to help the installation of BIPV(Building Integrated Photovoltaic) In addition, through domestic and international trends and cases survey, installation method was organized and applicable range of efficiency and design from First-generation solar cells to the third-generation solar cell was classified. Frist, Crystalline Solar cell module of first-generation is appropriate for the wall type, roof, louver, shading and etc. It has superiority of technology and price stability and can be achieved by a variety of aesthetic effects. Second, Dye-Sensitized Solar Cell of Thin Film solar cell can express a variety of colors, adjust light transmittance and maximize the aesthetic splendor. It is appropriate for the wall type, window type, curtain wall type and etc. Also, see-through type solar cell can provide comforts cause of free flow of light. And it is advantageous from economic due to adjust the indoor temperature. It is appropriate for the atrium type, curtain wall type, window type and etc.

• 한국전기전자재료학회논문지
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• 제30권6호
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• pp.401-405
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• 2017

Because silicon thin film solar cells have a high absorption coefficient in visible light, they can absorb 90% of the solar spectrum in a $1-{\mu}m$-thick layer. Silicon thin film solar cells also have high transparency and are lightweight. Therefore, they can be used for building integrated photovoltaic (BIPV) systems. However, the contact electrode needs to be replaced for fabricating silicon thin film solar cells in BIPV systems, because most of the silicon thin film solar cells use metal electrodes that have a high reflectivity and low transmittance. In this study, we replace the conventional aluminum top electrode with a transparent aluminum-doped zinc oxide (AZO) electrode, the band level of which matches well with that of the intrinsic layer of the silicon thin film solar cell and has high transmittance. We show that the AZO effectively replaces the top metal electrode and the bottom fluorine-doped tin oxide (FTO) substrate without a noticeable degradation of the photovoltaic characteristics.

• KEPCO Journal on Electric Power and Energy
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• 제6권2호
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• pp.157-161
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• 2020

온실 가스 감축과 관련하여 BIPV (Building Integrated Photovoltaics)는 청정 에너지 자원을 바탕으로 도심의 빌딩에서 자체적으로 전력을 생산할 수 있는 중요한 기술이다. 특히, 페로브스카이트 물질은 투명성을 지니고 있으며, 다양한 색상 구현이 가능하여 BIPV용 태양전지로 주목받고 있다. 그러나 태양전지의 투과도와 효율은 서로 반비례 관계에 있어 두 인자를 모두 높이는 것은 쉽지 않은 과제이다. 따라서 본 논문에서는 투과도와 효율을 모두 높일 수 있는 반투명 페로브스카이트 태양전지 구조를 제안하고, 이를 평가하였으며, 안정성 평가를 위해 국제표준에 따른 내구성 평가를 수행하였다.

• Bulletin of the Korean Chemical Society
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• 제28권6호
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• pp.953-958
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• 2007

Anchoring quantum dots (QDs) onto thermodynamically stable, large band gap oxide semiconductors is a very important strategy to enhance their quantum yields for solar energy conversion in both visible and near-IR regions. We describe a general procedure for anchoring a few chalcogenide QDs onto the titanium oxide layer. To anchor the colloidal QDs onto a mesoporous TiO2 layer, linker molecules containing both carboxylate and thiol functional groups were initially attached to TiO2 layers and subsequently used to capture dispersed QDs with the thiol group. Employing the procedure, we exploited cadmium selenide (CdSe) and cadmium telluride (CdTe) quantum dots (QDs) as inorganic sensitizers for a large band gap TiO2 layer of dye-sensitized solar cells (DSSCs). Their attachment was confirmed by naked eyes, absorption spectra, and photovoltaic effects. A few QD-TiO2 systems thus obtained have been characterized for photoelectrochemical solar energy conversion.

• 한국진공학회지
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• 제21권1호
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• pp.62-68
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• 2012

건재 일체형 태양광발전(BIPV) 응용을 위해 광 입사각에 따른 태양전지의 변환 효율은 중요하다. 양자효율은 태양전지의 파장별 전자 수집효율을 말하며, 입사각별 양자효율 측정으로 입사각에 따른 태양전지 출력 변화 요인을 분석할 수 있다. 이러한 입사각별 양자효율은 태양전지 종류에 따라 차이를 보인다. 본 연구에서는 가장 많이 쓰이는 벌크형 단결정 실리콘 태양전지와 박막형 비정질 실리콘 태양전지의 입사각별 양자효율을 비교하였다. 그 결과, 단결정 실리콘 태양전지에서는 광 입사각이 증가함에 따라 전 파장영역에서 양자효율이 감소했다. 반면, 비정질 박막 실리콘 태양전지에서는 단파장 영역에서는 결정질 실리콘과 동일하게 감소하였으나, 그 이후의 흡수 영역에서 약 $40^{\circ}$의 입사각까지 증가 또는 일정한 양자효율을 보이다가 이후에 급격히 감소하는 결과를 얻었다. 이는 비정질 박막 실리콘 태양전지에서 입사각이 증가함에 따라 특정 파장 영역에서 산란과 박막 구조의 영향으로 예상된다. 따라서, 태양전지의 구조 및 광학 구조 최적화 등으로 BIPV 적용에 유리한 구조 태양전지 제작이 가능할 것으로 보인다.

• 반도체디스플레이기술학회지
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• 제10권3호
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• pp.43-47
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• 2011

Recently the government banners green growth promises as a paradigm of national development which are to reduce greenhouse gases and environmental pollution by exhaust gases from automobiles. Existing in all countries around the world by using fossil fuels to minimize environmental changes are developing a new alternative energy sources. Among the emerging alternative energy, using solar energy technology is applied across the industry, but the maintenance and repair to integrate solar cells and has been a problem occurs. To prolong the life of cells integrated on a solar cell is exposed when the non-eye, etc., when not integrated by the solar cells should not be exposed. In order to resolve these contradictions, a intellectual solar green street lighting was developed by using Q(Quick)-TRIZ.

• 반도체디스플레이기술학회지
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• 제10권2호
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• pp.19-23
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• 2011

Global warming is affecting all industries, and has been applied very quickly in the energy sector. Existing in all countries around the world by using fossil fuels to minimize environmental changes are developing a new alternative energy sources. Among the emerging alternative energy, using solar energy technology is applied across the industry, but the maintenance and repair to integrate solar cells and has been a problem occurs. To prolong the life of cells integrated on a solar cell is exposed when the non-eye, etc., when not integrated by the solar cells should not be exposed. In order to resolve these contradictions, a square solar flower of the biological mother was developed by using TRIZ technique(6SC).