Current Photovoltaic Research

Korea Photovoltaic Society (한국태양광발전학회)
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Degradation Characteristics according to Encapsulant Materials Combining with Transparent Backsheet on the Mini Shingled Si Photovoltaic Modules

투명 백 시트와 봉지재 물질 조합에 따른 소형 슁글드 실리콘 태양전지 모듈의 열화 특성 분석

  • Son, Hyung Jin (New & Renewable Energy Research Center, Korea Electronic Technology Institute) ;
  • Kim, Sung Hyun (New & Renewable Energy Research Center, Korea Electronic Technology Institute)
  • 손형진 (신재생에너지 연구센터, 전자부품연구원) ;
  • 김성현 (신재생에너지 연구센터, 전자부품연구원)
  • Received : 2019.12.02
  • Accepted : 2020.02.16
  • Published : 2020.03.31
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Abstract

This study investigates the degradation characteristics of different material types of ethyl vinyl acetate (EVA) and polyolefin (POE) with combining transparent backsheet. To this end, we fabricated samples with structure of glass/encapsulant/transparent backsheet for each type of encapsulants, and shingled Si modules with the same structure. The samples were then subjected to accelerated test by storing under damp heat condition of 85℃ and 85% RH. As a result, encaplsulant discoloration was observed, which the transmittance of the samples with EVA decreased in a rapid rate than the samples with POE. The discoloration also affected a power degradation of the shingled modules with a reduction of current density, resulting that the module with EVA showed more drop on the efficiency than the modules with POE. Furthermore, corrosion of the soldered ribbon caused by acetic acid produced from the degraded EVA also contributed in fill factor reduction.

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References

  1. Kim, J. H., “Outdoor Testing and Degradation of EVA and POE Encapsulated Photovoltaic Modules,” J. Korean Inst. Electr. Electron. Mater. Eng., Vol. 29, No. 12, pp. 847-852, 2016. https://doi.org/10.4313/JKEM.2016.29.12.847
  2. Agroui, K., "Thermal stability of slow and fast cure EVA encapsulant material for photovoltaic module manufacturing process," Sol. Energy Mater. Sol. Cells, Vol. 90, pp. 2509-2514, 2006. https://doi.org/10.1016/j.solmat.2006.03.023
  3. Chattopadhyay, S., "Visual degradation in field-aged crystalline silicon PV Modules in India and correlation with electrical degradation," IEEE J. Photovolt., Vol. 4, pp. 1470-1476, 2014. https://doi.org/10.1109/JPHOTOV.2014.2356717
  4. Pern, F. J., "Weathering degradation of EVA encapsulant and the effect of its yellowing on solar cell efficiency," IEEE, pp. 557-561, 2010.
  5. Sinha, A., "Nondestructive characterization of encapsulant discoloration effects in crystalline-silicon PV modules," Sol. Energy Mate. Sol. Cells, Vol. 155, pp. 234-242, 2016. https://doi.org/10.1016/j.solmat.2016.06.019
  6. Pern, F. J., "Characterization of ethylene vinyl acetate (EVA) encapsulant: Effects of thermal processing and weathering degradation on its discoloration," Sol. Energy Mate. Sol. Cells, Vol. 25, pp. 3-23, 1992. https://doi.org/10.1016/0927-0248(92)90013-F
  7. Lopez-Escalante, M. C., "Polyolefin as PID-resistant encapsulant material in PV modules," Sol. Energy Mate. Sol. Cells, Vol. 144, pp. 691-699, 2016. https://doi.org/10.1016/j.solmat.2015.10.009
  8. Hacke, P., "Characterization of multicrystalline silicon modules with system bias voltage applied in damp heat," 25th European Photovoltaic Solar Energy Conference, Valencia, pp. 3760-3765, 2010.
  9. Bauer, J., "On the mechanism of potential-induced degradation in crystalline silicon solar cells," Phys. Status Solidi RRL, Vol. 6, pp. 331-333, 2012. https://doi.org/10.1002/pssr.201206276
  10. Berghold, J., "Properties of encapsulation materials and their relevance for recent field failures," IEEE 40th PVSC, pp. 1987-1992, 2014.
  11. Yang, J., "Effect of various encapsulants for frameless glass to glass Cu(In,Ga)(Se,S)2 photovoltaic module," RSC Adv., Vol. 5, p. 51258, 2015. https://doi.org/10.1039/C5RA03663A