• 한국태양에너지학회:학술대회논문집
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• 2008.11a
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• pp.30-35
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• 2008

The purpose of EVA sheet in PV module is to bond or laminate the multiple layers of a module. We studied the influence of EVA sheet gel content on photovoltaic module durability. Gel Content was measured by manufacturing Glass/EVA Sheet/Back Sheet scheme at several curing temperature. Through this experiment, we could confirm that there are changes on Gel Content of EVA Sheet. The transmittance of $140^{\circ}C$/4min process condition was more excellent than the other condition at ultraviolet wavelength range. The thermal stability of $150^{\circ}C$/4min process condition was higher than the other condition.

• 한국태양에너지학회:학술대회논문집
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• 2008.04a
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• pp.98-103
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• 2008

The glass for crystalline PV module fabrication should have high thermal and mechanical resistance to environmental also have high transparency. In this paper, we analyze the optical characteristics of glasses for photovoltaic module application. The transmittance of several glasses are measured. The effects of texturing on low iron glass, glass thickness, anti-reflective glass, photocatalyst-treated glass and special glass are compared each other. Then this will give some information to select PV glass for manufacturing. The detailed analysis is described in the following paper.

• Proceedings of the SAREK Conference
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• 2009.06a
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• pp.792-797
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• 2009

The excess heat that is generated from PV modules can be removed and converted into useful thermal energy. A photovoltaic-thermal(PVT) module is a combination of photovoltaic module with a solar thermal collector, forming one device that receives solar radiation and produces electricity and heat simultaneously. In general, two types of PVT can be classified: glass-covered PVT module, which produces high-temperature heat but has a slightly lower electrical yield, and uncovered PVT module, which produces relatively lower temperature heat but has a somewhat higher electrical performance. In this paper, the experimental performance of two types of the PVT combined module(water type), glazed(glass-covered) and unglazed, was analyzed. The electrical and thermal performance of the PVT combined modules were measured in outdoor conditions, and the results were compared.

• Current Photovoltaic Research
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• v.10 no.1
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• pp.16-22
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• 2022

The long-term stability of PSCs against visual and UV light, moisture, electrical bias and high temperature is an important issue for commercialization. In particular, since the operation temperature of solar cell can rise above 85℃, a study on thermal stability is required. In this study, the cause of thermal-induced degradation of PSCs was investigated using the SCAPS-1D simulation tool. First, PSCs of TiO₂/CH₃NH₃PbI₃/Spiro-OMeTAD/Au structure were exposed to a constant temperature of 85℃ to observe changes in conversion efficiency and quantum efficiency. Because the EQE reduction above 500 nm was remarkable, we simulated PSCs performance as a function of lifetime, doping density of perovskite and spiro-OMeTAD. Consequently, the main cause of thermal-induced degradation is considered to be the change in the perovskite doping concentration and lifetime due to ion migration of perovskite.

• Journal of the Korean Vacuum Society
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• v.21 no.3
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• pp.136-141
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• 2012

We report investigation of structural and optical characteristics of $In_2Se_3$ thin films fabricated by thermal annealing process. Indium (In) is deposited on substrates by sputtering methods and $In_2Se_3$ thin films are fabricated by thermal annealing it with selenium vapor. The annealing temperature was changed from $150^{\circ}C$ to $400^{\circ}C$. We observe formation and phase changes of $In_2Se_3$ thin films with increase of annealing temperature. Conglomeration of In is observed at low annealing temperature (${\leq}150^{\circ}C$). $In_2Se_3$ phases are started to form at $200^{\circ}C$ and ${\gamma}-In_2Se_3$ phase form at $350^{\circ}C$. High-quality ${\gamma}-In_2Se_3$ thin film with wurtzite structure is obtained at $400^{\circ}C$ of annealing temperature. Furthermore, we confirm that band gaps of $In_2Se_3$ thin films are increased according to increase of annealing temperature. Optical band gap of high-quality ${\gamma}-In_2Se_3$ is found to be 1.796eV.

• Journal of the Korean Society of Safety
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• v.33 no.4
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• pp.1-7
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• 2018

This paper is analyzed for the thermal characteristics(1 year) of the 6 components(DC breaker, DC filter(including capacitor and discharge resistance), IGBT(Insulated gate bipolar mode transistor), AC filter, AC breaker, etc.) of a photovoltaic power generation-based PCS(Power conditioning system) below 20 kW. Among the modules, the discharge resistance included in the DC filter indicated the highest heat at $125^{\circ}C$, and such heat resulting from the discharge resistance had an influence on the IGBT installed on the rear side the board. Therefore, risk priority through risk priority number(RPN) of FMEA(Failure modes and effects analysis) sheet is conducted for classification into top 10 %. According to thermal characteristics and FMEA, it is necessary to pay attention to not only the in-house defects found in the IGBT, but also the conductive heat caused by the discharge resistance. Since it is possible that animal, dust and others can be accumulated within the PCS, it is possible that the heat resulting from the discharge resistance may cause fire. Accordingly, there are two options that can be used: installing a heat sink while designing the discharge resistance, and designing the discharge resistance in a structure capable of avoiding heat conduction through setting a separation distance between discharge resistance and IGBT. This data can be used as the data for conducting a comparative analysis of abnormal signals in the process of developing a safety device for solar electricity-based photovoltaic power generation systems, as the data for examining the fire accidents caused by each module, and as the field data for setting component management priorities.

• Journal of the Korean Solar Energy Society
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• v.31 no.4
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• pp.95-102
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• 2011

In this paper, the thermal performance of a heat spreader module for CPV(Concentrating Photovoltaic) cooling is experimentally investigated. In order to evaluate the thermal performance of the heat spreader module which consists of a Metal PCB and an aluminum alloy heat spreader, experiments are conducted with varying the type of the metal PCB, the thickness of the heat spreader, the inclination angle, and the applied heat flux. To validate the experimental data, three dimensional numerical simulations are performed using the commercial simulation tool in the present work. The experimental results are compared with the corresponding numerical results and are in close agreement with the numerical results. From the experimental results, the temperature difference between the maximum temperature and the ambient temperature increases with decreasing the thickness of the heat spreader and with increasing the applied heat flux. Also, it is found that the inclination angle significantly affects the thermal performance of the heat spreader. the maximum temperature difference of the heat spreader with the horizontal orientation is much larger than that with the vertical orientation.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.245.2-245.2
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• 2013

Solution processed organic photovoltaic devices have relatively less attention compared to polymer photovoltaic devices even though they have high possibility to be developed because they have both advantages of polymer and organic, such as solution processable, no synthetic batch dependence of photovoltaic performance, high purity and high charge carrier mobility as well as relatively high efficiency (~7%). In addition, solution processed organic photovoltaic devices have an advantage of easiness to study the relationship between the molecular structure and photovoltaic performance due to its simple structure. In this work, five isoindigo based low band gap donor-acceptor-donor (D-A-D) small molecules with different electron donating strength were synthesized for investigating the relationship between the molecular structure and photovoltaic performance, especially, investigating the effects of different electron donating effect of donor group in isoindigo backbone to photovoltaic device performance. The variation of electron donating strength of donor group strongly affected the optical, thermal, electrochemical and photovoltaic device performances of isoindigo organic materials. The highest power conversion efficiency of ~3.2% was realized in bulk heterojuction photovoltaic device consisted of the ID3T as donor and PC70BM as acceptor. This work demonstrates the great potential of isoindigo moieties as electron deficient units as well as guideline for synthesis of donor-acceptor-donor (D-A-D) small molecules for realizing highly efficient solution processed organic photovoltaic devices.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.37 no.12
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• pp.48-53
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• 2008

• 한국태양에너지학회:학술대회논문집
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• 2011.11a
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• pp.93-98
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• 2011

A photovoltaic/thermal(PVT)collector produces both thermal energy and electricity simultaneously. The heat from PV modules should be removed for better electrical performance, and can be converted into useful thermal energy. A PVT module is a combination of PV module with a solar thermal collector which forms one device that converts solar radiation into electricity and heat. In general, there are two different types of PVT module: glazed PVT module and unglazed PVT module. On the other hand, two types of the PVT module can be distinguished according to absorber on PV module rear side: the sheet-and-tube absorber PVT module and the fully wetted absorber PVT module. The absorber collector plays an important function in PVT system. It cools down the PV module, while collecting the thermal energy produced in the form of hot water. The aim of this study is to compare the electrical and thermal performance of two different PVT collectors, one with the rectangular tube and the other with fully wetted absorber PVT collectors. For this paper, the PVT collectors with two different types of thermal absorber were made, and both the thermal and electrical performance of them were measured in outdoor, and the results were compared. The experimental results were analyzed that the thermal efficiency of the fully wetted absorber PVT collector is about 8.7% higher than the sheet-and-tube absorber PVT collector, and for the electrical efficiency, the fully wetted absorber PVT collector had about 7% higher than the rectangular tube absorber.