The use of edge pressure on photovoltaic thin film modules

Can edge seal materials be used in photovoltaic applications?

Here, using a Ca film deposited on a glass substrate, we demonstrate the evaluation of edge seal materials in a manner that effectively duplicates their use in a photovoltaic application and compare the results with standard methods for measuring water vapor transport.

What is a thin film PV module?

An additional layer of EVA adheres the back sheet to the cells. The lamination process is a batch type manufacturing process which requires large capital expenditure. Thin film PV modules use a similar lamination process, with the addition of an edge seal to prevent or minimize moisture ingress (Strevel et al., 2013).

Why do thin-film modules have a high voltage?

Due to the high number of individual cells, lower cell and module currents and higher module voltages are typical of thin-film modules. That means that relatively few modules can be connected in series. Some thin-film modules have higher voltages during their initial operation, further reducing the possible string length.

Why should we encapsulate thin film PV modules?

Since the lamination process is a well-established technology, lamination in the thin film PV module is also primarily used to reduce the overheard research cost. This creates a void for an innovative technology to encapsulate thin film PV modules.

Does moisture ingress affect the performance of a PV module?

Moisture ingress will degrade the performance of a PV module. An advantage of the glass-glass configuration is that moisture ingress can occur only along the perimeter of the module. The main function of the edge seal is to minimize moisture ingress around the perimeter.

What is a thin-film module – building integrated PV (BIPV)?

Thin-film modules are particularly popular in BIPV – Building Integrated PV. They are often preferred due to their uniform appearance, and additionally these installations are far more frequently affected by shading. In particular, vertical surfaces are generally affected by shading to a greater extent, e.g. by neighboring buildings and canopies.