The Japan Industrial Technology Research Institute, in collaboration with Sustainable Titania Technology, has introduced a groundbreaking innovation that effectively mitigates the issue of Potential Induced Degradation (PID), a common problem that reduces the efficiency of solar cell modules over time. This new technology employs a straightforward and cost-effective method—applying a thin film composed of titanium oxide-based composite materials onto glass substrates. The process involves coating the glass using a "Doctor Blade" technique, followed by heat treatment at temperatures ranging from 200°C to 450°C for 15 minutes. This approach is not only simple but also highly promising for addressing PID issues in the solar industry.
The application of this technology was tested on a standard 18cm×18cm solar cell module. During a PID test conducted under conditions of -1000V, 85°C, and for 2 hours, the module showed minimal degradation in conversion efficiency. In contrast, conventional modules typically experience a dramatic drop, from 15.9% to as low as 0.6%. Researchers believe the effectiveness of this technology stems from its ability to block the migration of sodium ions from the glass, which is a primary cause of PID.
Looking ahead, the team plans to refine the material composition, optimize the film thickness, and adjust the coating parameters to further enhance the technology's performance. Additionally, they aim to explore the underlying mechanism of PID suppression and conduct tests on larger-scale modules to validate its real-world applicability.
Details about this breakthrough will be presented at the “Production Research Institute Photovoltaic Power Generation Engineering Research Center Results Report 2013†conference, held at the Tsukuba International Conference Center on June 4 and 5, 2013. This development marks a significant step forward in improving the longevity and reliability of solar panels, making them more efficient and sustainable in the long run.
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