Researchers from the Fraunhofer Institute for Solar Energy Systems in Germany developed a predictive model for light and raised temperature induced breakdown in Gallium -doped silicon waffle that includes the effects of temporary recovery.
A team led by researchers from Fraunhofer Institute for Solar Energy Systems (Fraunhofer Isee), based in Germany), has developed a parametric predictive model for light and raised temperature-induced demolition (Letid) in Gallium-moored silicon waffles about the temporary recovery effect.
“We have specifically investigated the kinetics of temporary recovery in Gallium-doted silicon” PV -Magazinenotice that the group had earlier demonstrated and reported in Solar energy materials and solar cells That temporary recovery can suppress the degree of Letid breakdown.
Furthermore, the team developed a model for Letid in Gallium-merged Czochralski silicon waffles, including kinetics at different temperatures and minority taxes, and measuring the resulting changes in effective lifespan.
The work resulted in a quantitative description of all relevant sub -processes. “Our new insights into kinetics enable us to model this oppression precisely,” said Thome.
A challenging aspect was the in situ aspect of the research. “Because temporary recovery quickly changes the lifespan of the samples, we had to design a specific in-situ experiment. This was necessary to correctly determine the model entry parameters,” he explained.
The scientists concluded that temporary recovery is ‘a multi -step process’, with at least two different sub -reactions.
“By examining the temporary recovery in Galicon-doped silicon, we can investigate breakdown and regeneration, we have established that the speed of temporary recovery increases as the temperature is lowered. This is quantitatively reflected in a reversed Arrhenius behavior,” the team said.
“This makes it possible to predict the breakdown speed and its size as a function of temperature and minority loading density,” it said.
“Since temporary recovery (TR) Letid can suppress or reduce, especially in winter periods, quantifying this behavior is the key to the complete Letid model,” said Thome, adding that if TR is not absorbed correctly, the degradation caused by Letid can be overestimated.
The work appears in “Light and raised temperature -induced breakdown in with gallium -doped silicon: a complete parametric description“Published in Solar energy materials and solar cells.
The group now connects the parametric model with an atomist. Whose preliminary results will be presented by research team member Wolfram Kwapil on the European Photovoltaic Solar Energy Conference and Exhibition 2025 (EU PVSEC 2025) in Bilbao, according to Thome. Other members of the research team came from Inatech and the University of Freiburg.
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