Research on potential induced degradation (PID) of polymeric backsheet in PV modules after salt-mist exposure

•Degree of PID of PV backsheet after salt mist exposure can be evaluated by DSC.•Degree of crystallinity increased under PD with the increasing salt-mist exposure.•Erosion rate of PV backsheets is influenced by salt-mist exposure and PD activity.•Electron avalanche releases kinetic energy and damage...

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Veröffentlicht in:Solar Energy 2019-08, Vol.188, p.475-482
Hauptverfasser: Zhang, Jia-wei, Cao, De-kun, Diaham, Sombel, Zhang, Xin, Yin, Xun-qian, Wang, Qian
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container_end_page 482
container_issue
container_start_page 475
container_title Solar Energy
container_volume 188
creator Zhang, Jia-wei
Cao, De-kun
Diaham, Sombel
Zhang, Xin
Yin, Xun-qian
Wang, Qian
description •Degree of PID of PV backsheet after salt mist exposure can be evaluated by DSC.•Degree of crystallinity increased under PD with the increasing salt-mist exposure.•Erosion rate of PV backsheets is influenced by salt-mist exposure and PD activity.•Electron avalanche releases kinetic energy and damages the lattice of backsheet.•Molecules dissociated by low-energy electrons form anions, radicals and excitons. Recently, solar photovoltaic (PV) systems have been helping to relieve the global energy crisis. However, the service lifetime of PV systems may be shorter than the designed time. The backsheet, which is usually made of polyethylene terephthalate (PET), influences the long-term reliability of PV systems. When a PV system is located in a coastal area, the backsheet usually suffers from various problems such as partial discharge (PD) activity induced by the leakage current caused by potential-induced degradation (PID) because of exposure to salt-mist. Here we used atomic force microscopy (AFM), scanning electron microscopy (SEM), Raman spectroscopy, differential scanning calorimetry (DSC) and phase-resolved partial discharge (PRPD) to explore the PD activity of PET backsheets caused by PID after salt-mist exposure. The analyses revealed that the surface roughness of the PET backsheet increased with the salt-mist duration. Raman spectroscopy indicated that some chemical groups changed after PD activity and salt-mist exposure. The degree of crystallinity increased under the condition of PD activity with increasing salt-mist exposure time. The result of PRPD indicated that PD activity depended salt-mist exposure conditions. From these results, we found that the erosion rate of PET backsheets was influenced by salt-mist exposure and PD activity induced by the leakage current caused by PID. These findings provide guidance to improve the durability of insulating backsheets of PV systems.
doi_str_mv 10.1016/j.solener.2019.06.019
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Recently, solar photovoltaic (PV) systems have been helping to relieve the global energy crisis. However, the service lifetime of PV systems may be shorter than the designed time. The backsheet, which is usually made of polyethylene terephthalate (PET), influences the long-term reliability of PV systems. When a PV system is located in a coastal area, the backsheet usually suffers from various problems such as partial discharge (PD) activity induced by the leakage current caused by potential-induced degradation (PID) because of exposure to salt-mist. Here we used atomic force microscopy (AFM), scanning electron microscopy (SEM), Raman spectroscopy, differential scanning calorimetry (DSC) and phase-resolved partial discharge (PRPD) to explore the PD activity of PET backsheets caused by PID after salt-mist exposure. The analyses revealed that the surface roughness of the PET backsheet increased with the salt-mist duration. Raman spectroscopy indicated that some chemical groups changed after PD activity and salt-mist exposure. The degree of crystallinity increased under the condition of PD activity with increasing salt-mist exposure time. The result of PRPD indicated that PD activity depended salt-mist exposure conditions. From these results, we found that the erosion rate of PET backsheets was influenced by salt-mist exposure and PD activity induced by the leakage current caused by PID. 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Recently, solar photovoltaic (PV) systems have been helping to relieve the global energy crisis. However, the service lifetime of PV systems may be shorter than the designed time. The backsheet, which is usually made of polyethylene terephthalate (PET), influences the long-term reliability of PV systems. When a PV system is located in a coastal area, the backsheet usually suffers from various problems such as partial discharge (PD) activity induced by the leakage current caused by potential-induced degradation (PID) because of exposure to salt-mist. Here we used atomic force microscopy (AFM), scanning electron microscopy (SEM), Raman spectroscopy, differential scanning calorimetry (DSC) and phase-resolved partial discharge (PRPD) to explore the PD activity of PET backsheets caused by PID after salt-mist exposure. The analyses revealed that the surface roughness of the PET backsheet increased with the salt-mist duration. Raman spectroscopy indicated that some chemical groups changed after PD activity and salt-mist exposure. The degree of crystallinity increased under the condition of PD activity with increasing salt-mist exposure time. The result of PRPD indicated that PD activity depended salt-mist exposure conditions. From these results, we found that the erosion rate of PET backsheets was influenced by salt-mist exposure and PD activity induced by the leakage current caused by PID. 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Recently, solar photovoltaic (PV) systems have been helping to relieve the global energy crisis. However, the service lifetime of PV systems may be shorter than the designed time. The backsheet, which is usually made of polyethylene terephthalate (PET), influences the long-term reliability of PV systems. When a PV system is located in a coastal area, the backsheet usually suffers from various problems such as partial discharge (PD) activity induced by the leakage current caused by potential-induced degradation (PID) because of exposure to salt-mist. Here we used atomic force microscopy (AFM), scanning electron microscopy (SEM), Raman spectroscopy, differential scanning calorimetry (DSC) and phase-resolved partial discharge (PRPD) to explore the PD activity of PET backsheets caused by PID after salt-mist exposure. The analyses revealed that the surface roughness of the PET backsheet increased with the salt-mist duration. Raman spectroscopy indicated that some chemical groups changed after PD activity and salt-mist exposure. The degree of crystallinity increased under the condition of PD activity with increasing salt-mist exposure time. The result of PRPD indicated that PD activity depended salt-mist exposure conditions. From these results, we found that the erosion rate of PET backsheets was influenced by salt-mist exposure and PD activity induced by the leakage current caused by PID. These findings provide guidance to improve the durability of insulating backsheets of PV systems.</abstract><cop>New York</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.solener.2019.06.019</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0002-3688-0607</orcidid><oa>free_for_read</oa></addata></record>
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subjects Atomic force microscopy
Backsheet
Calorimetry
Coastal zone
Crystallinity
Degradation
Degree of crystallinity
Differential scanning calorimetry
Discharge
Engineering Sciences
Erosion mechanisms
Erosion rates
Exposure
Leakage
Leakage current
Microscopy
Mist
Organic chemistry
Photovoltaic cells
Photovoltaics
Polyethylene
Polyethylene terephthalate
Potential-induced degradation
Raman spectroscopy
Reliability
Salts
Scanning electron microscopy
Service life
Solar cells
Solar energy
Spectroscopy
Spectrum analysis
Surface roughness
title Research on potential induced degradation (PID) of polymeric backsheet in PV modules after salt-mist exposure
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