light-induced degradation

Should the industry be alarmed at the potential degradation susceptibility of tunnel oxide passivated contact (TOPCon) solar cells? Or are the problems easily addressed and more a reflection of rushed-to-market products? pv magazine contributor and consultant Götz Fischbeck reports.

US scientists recently put different bifacial solar cells and modules through a series of tests at elevated temperature, humidity, voltage and mechanical stress levels. The tests revealed a range of light-induced and potential-induced degradation mechanisms that modules will likely suffer in the field.

Scientists in the United States used sophisticated imaging to delve deep into the structure of a silicon solar cell, revealing for the first time a distinct defect signature for light-induced degradation. Their technique could be used to better understand the mechanisms behind multiple various defects affecting the performance of silicon and other solar cell technologies.

Scientists in Europe took a very close look at the thin amorphous silicon layers used in heterojunction and tandem solar cells, building a full picture of the material’s structure at the nanoscale. Their findings could help scientists solve the long-standing mystery of light induced degradation.

Scientists led by the University of New South Wales have looked into the long-term degradation of silicon-heterojunction. Their findings suggest that illumination at high temperatures could actually improve cell efficiency, but also risks activating multiple light-induced degradation mechanisms if not carefully controlled.

Asier Ukar, director of the Spanish unit of German technical advisory PI Berlin, tells pv magazine about his experiences of conducting quality control inspections in Chinese factories during the global pandemic.

Australian researchers have unveiled hydrogenation technology to reduce light and elevated temperature-induced degradation in Czochralski silicon PERC solar cells. The developers say the process can minimize degradation without sacrificing performance in cells and modules.

The Chinese company has announced it has acquired intellectual property rights pertaining to various applications of gallium-doped silicon wafers in solar cell applications from Japanese company Shin-Etsu Chemical.

The Chinese PV manufacturer uses TOPCon half cells for the modules. The additional rear side yield is estimated by Trina at 5-30%.

With competition on the module market as cutthroat as ever, manufacturers are increasingly looking to emphasize the quality and reliability of their products and services as a differentiator. pv magazine investigates what’s behind some of these claims, and the move from manufacturers to more sophisticated quality assurance methods.