Unveiling the Potential of Electroluminescence Characteristics in Investigating Different Types of Defects and Degradations in c-Si PV Module





Electroluminescence Imaging, EL Characteristics, I-V Characteristic, Defects, Degradation, Solar Cell


Photovoltaic (PV) cells can be characterized using current-voltage (I-V) as well as electroluminescence (EL) characteristics. However, unlike I-V, the potential of EL characteristics has not been well discussed in the literature. In this work, the impact of different types of defects on the EL characteristics is studied, and the possible use of EL characteristics in the qualitative and quantitative investigation of defects is unveiled. Defective field-aged and new modules with artificially induced defects were taken for experimental study. EL current-intensity (I-ɸ) and EL voltage-intensity (V-ɸ) characteristics were studied for the cells suffering from major defects such as cracks, busbar interconnect failure, and PID-shunting. It is observed that I-ɸ characteristic is useful in the investigation of shunting defects, whereas V-ɸ characteristic is in diagnosing defect that increases series resistance. Bulk defects within a cell affect EL calibration constants and increase cell-to-cell mismatch within a module. The findings of this work would be useful for extracting valuable information from EL images regarding defects and degradations.


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M. Aghaei et al., “Review of degradation and failure phenomena in photovoltaic modules,” Renew. Sustain. Energy Rev., vol. 159, no. January, p. 112160, 2022, doi: https://doi.org/10.1016/j.rser.2022.112160.

L. Koester, S. Lindig, A. Louwen, A. Astigarraga, G. Manzolini, and D. Moser, “Review of photovoltaic module degradation, field inspection techniques and techno-economic assessment,” Renew. Sustain. Energy Rev., vol. 165, no. November 2021, p. 112616, 2022, doi: https://doi.org/10.1016/j.rser.2022.112616.

A. Sinha, O. S. Sastry, and R. Gupta, “Nondestructive characterization of encapsulant discoloration effects in crystalline-silicon PV modules,” Sol. Energy Mater. Sol. Cells, vol. 155, pp. 234–242, 2016, doi: https://doi.org/10.1016/j.solmat.2016.06.019.

J. Lindroos and H. Savin, “Review of light-induced degradation in crystalline silicon solar cells,” Sol. Energy Mater. Sol. Cells, vol. 147, pp. 115–126, 2016, doi: https://doi.org/10.1016/j.solmat.2015.11.047.

V. E. Puranik and R. Gupta, “Analysis and insight of electroluminescence imaging in the assessment of potential-induced degradation in crystalline silicon photovoltaic module,” Eng. Fail. Anal., vol. 134, Apr. 2022, doi: 10.1016/j.engfailanal.2022.106027.

O. Kunz et al., “Outdoor luminescence imaging of field-deployed PV modules,” Prog. Energy, vol. 4, no. 4, 2022, doi: https://doi.org/10.1088/2516-1083/ac9a33.

T. Fuyuki, H. Kondo, T. Yamazaki, Y. Takahashi, and Y. Uraoka, “Photographic surveying of minority carrier diffusion length in polycrystalline silicon solar cells by electroluminescence,” Appl. Phys. Lett., vol. 86, no. 26, pp. 1–3, 2005, doi: https://doi.org/10.1063/1.1978979.

T. Fuyuki, H. Kondo, Y. Kaji, A. Ogane, and Y. Takahashi, “Analytic findings in the electroluminescence characterization of crystalline silicon solar cells,” J. Appl. Phys., vol. 101, no. 2, 2007, doi: https://doi.org/10.1063/1.2431075.




How to Cite

Puranik, V. E., Kumar, R., & Gupta, R. (2024). Unveiling the Potential of Electroluminescence Characteristics in Investigating Different Types of Defects and Degradations in c-Si PV Module. SiliconPV Conference Proceedings, 1. https://doi.org/10.52825/siliconpv.v1i.843

Conference Proceedings Volume


Module Characterization and Simulation