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A drift and diffusion model for PID-s in solar modules

  • A quantitative physical model for potential induced degradation of the shunting type (PID-s) in solar modules is introduced. Based on a drift and diffusion approach for sodium ions and atoms, it gives insight into the kinetics of degradation and the corresponding regeneration. A simple drift/source term is used to describe the time-dependent flux of Na-ions towards stacking faults at the surface of the solar cell. The assumed transport mechanism for Na+ ions through the SiN-layer uses the modified Stern-Eyring rate theory but our approach can also be adapted to other mechanisms. Several PID-s and regeneration curves of one-cell solar modules at T = 49°C and T = 90°C with 1000V potential difference between modul frame and cell were measured and least-square fits of the in-situ measured parallel resistance Rsh to the model were performed giving very good accordance. Based on a few measurements, the model can predict PID-s and regeneration characteristics of solar modules under different conditions.
Metadaten
Author:Achim Schulze, M. B. Koentopp, C. Taubitz
URL:https://doi.org/10.1109/JPHOTOV.2020.3003776
Parent Title (English):IEEE Journal of Photovoltaics
Publisher:IEEE
Place of publication:USA
Document Type:Article (peer reviewed)
Language:English
Publication Year:2020
Tag:Photovoltaic cells, Photovoltaic systems, PID
Volume:2020
Page Number:6
Peer reviewed:Ja
faculties / departments:Fakultät für Angewandte Natur- und Geisteswissenschaften