The Japan Industrial Technology Research Institute and Sustainable Titania Technology have jointly developed technologies that can suppress the phenomenon of Potential Induced Degeneration (PID), which reduces the output power of solar cell modules. According to reports, this new technology can be realized by a simple method of coating low-cost materials on glass substrates. Therefore, it is a technology that is expected to solve the PID problem.
Cross section structure of module (right) and common module (left) to which this technology is applied
Trial module appearance and PID test results
The technology developed this time is applied to a glass substrate constituting a solar cell module, coated with a TiO 2 (titanium oxide) based composite metal compound thin film, dried, and then heat-treated at a temperature of 200 to 450° C. for 15 minutes. In the coating operation, a "Doctor Blade method" is employed in which a solution containing a raw material is dripped and then diluted on a whole substrate with a metal prop, a metal rod, and the like.
Using the technology developed this time in a solar cell module with an external size of 18cm×18cm and performing a PID test (-1000V, 85°C, 2 hours), it was found that the decrease in conversion efficiency before and after the test was small. For ordinary modules, the conversion efficiency before and after the test will be significantly reduced from 15.9% to 0.6%. The main reason for the PID phenomenon is estimated - the diffusion of sodium ions in the glass is blocked by the film.
In the future, the material, film thickness, and film formation conditions of the thin film will be optimized to further improve the inhibitory effect of the PID phenomenon. At the same time, the principle of suppression of PID phenomena will also be explored, and large-area modules will be used for testing.
The details will be announced 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.
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