Micro cracks distribution and power degradation of polycrystalline solar cells wafer: Observations constructed from the analysis of 4000 samples

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Abstract

In this paper, the impact of Photovoltaic (PV) micro cracks is assessed through the analysis of 4000 polycrystalline silicon solar cells. The inspection of the cracks has been carried out using an electron microscopy, which facilitate the detection of the cracks though the acquisition of both Everhart-Thornley Detector (ETD) and the Back Scatted Electron Diffraction (BSED) image, where it was found that the size micro cracks are ranging from 50 μm to a maximum of 4 mm. Micro cracks have been categorized into two main categories, including cracks in the solar cell front or rear contact. Several remarkable observations have been found, including but not limited to, (i) the output power loss due to micro cracks varies from 0.9% to 42.8%, subject to micro crack type and size, (ii) cracks in solar cells fingers reduce the finger width, resulting an increase in the output power loss by at least 1.7%, and (iii) there is a substantial correlation between PV hot-spots and the presence of micro cracks, while minimum increase in the cell temperature is observed at 7.6 °C.
LanguageEnglish
Pages466-477
Number of pages12
JournalRenewable Energy
Volume145
Early online date15 Jun 2019
DOIs
Publication statusE-pub ahead of print - 15 Jun 2019

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Solar cells
Cracks
Degradation
Silicon solar cells
Polysilicon
Electron diffraction
Electron microscopy
Inspection
Detectors

Cite this

@article{176dd5f9067f4a61b1b55c0eb8b59d62,
title = "Micro cracks distribution and power degradation of polycrystalline solar cells wafer: Observations constructed from the analysis of 4000 samples",
abstract = "In this paper, the impact of Photovoltaic (PV) micro cracks is assessed through the analysis of 4000 polycrystalline silicon solar cells. The inspection of the cracks has been carried out using an electron microscopy, which facilitate the detection of the cracks though the acquisition of both Everhart-Thornley Detector (ETD) and the Back Scatted Electron Diffraction (BSED) image, where it was found that the size micro cracks are ranging from 50 μm to a maximum of 4 mm. Micro cracks have been categorized into two main categories, including cracks in the solar cell front or rear contact. Several remarkable observations have been found, including but not limited to, (i) the output power loss due to micro cracks varies from 0.9{\%} to 42.8{\%}, subject to micro crack type and size, (ii) cracks in solar cells fingers reduce the finger width, resulting an increase in the output power loss by at least 1.7{\%}, and (iii) there is a substantial correlation between PV hot-spots and the presence of micro cracks, while minimum increase in the cell temperature is observed at 7.6 °C.",
keywords = "Photovoltaic (PV), Photovoltaic (PV) cracks, Photovoltaic (PV) hot spotting analysis, Statistical analysis, Probabilistic approach, Observations, Power losses, Micro cracks detection, nano-scratch, Nanostructure",
author = "Mahmoud Dhimish",
year = "2019",
month = "6",
day = "15",
doi = "10.1016/j.renene.2019.06.057",
language = "English",
volume = "145",
pages = "466--477",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Micro cracks distribution and power degradation of polycrystalline solar cells wafer

T2 - Renewable Energy

AU - Dhimish, Mahmoud

PY - 2019/6/15

Y1 - 2019/6/15

N2 - In this paper, the impact of Photovoltaic (PV) micro cracks is assessed through the analysis of 4000 polycrystalline silicon solar cells. The inspection of the cracks has been carried out using an electron microscopy, which facilitate the detection of the cracks though the acquisition of both Everhart-Thornley Detector (ETD) and the Back Scatted Electron Diffraction (BSED) image, where it was found that the size micro cracks are ranging from 50 μm to a maximum of 4 mm. Micro cracks have been categorized into two main categories, including cracks in the solar cell front or rear contact. Several remarkable observations have been found, including but not limited to, (i) the output power loss due to micro cracks varies from 0.9% to 42.8%, subject to micro crack type and size, (ii) cracks in solar cells fingers reduce the finger width, resulting an increase in the output power loss by at least 1.7%, and (iii) there is a substantial correlation between PV hot-spots and the presence of micro cracks, while minimum increase in the cell temperature is observed at 7.6 °C.

AB - In this paper, the impact of Photovoltaic (PV) micro cracks is assessed through the analysis of 4000 polycrystalline silicon solar cells. The inspection of the cracks has been carried out using an electron microscopy, which facilitate the detection of the cracks though the acquisition of both Everhart-Thornley Detector (ETD) and the Back Scatted Electron Diffraction (BSED) image, where it was found that the size micro cracks are ranging from 50 μm to a maximum of 4 mm. Micro cracks have been categorized into two main categories, including cracks in the solar cell front or rear contact. Several remarkable observations have been found, including but not limited to, (i) the output power loss due to micro cracks varies from 0.9% to 42.8%, subject to micro crack type and size, (ii) cracks in solar cells fingers reduce the finger width, resulting an increase in the output power loss by at least 1.7%, and (iii) there is a substantial correlation between PV hot-spots and the presence of micro cracks, while minimum increase in the cell temperature is observed at 7.6 °C.

KW - Photovoltaic (PV)

KW - Photovoltaic (PV) cracks

KW - Photovoltaic (PV) hot spotting analysis

KW - Statistical analysis

KW - Probabilistic approach

KW - Observations

KW - Power losses

KW - Micro cracks detection

KW - nano-scratch

KW - Nanostructure

U2 - 10.1016/j.renene.2019.06.057

DO - 10.1016/j.renene.2019.06.057

M3 - Article

VL - 145

SP - 466

EP - 477

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -