Environmental and accelerated ageing tests were performed on the indoor dye modules described in Sect. 7.6 in order to detect failure mechanisms. Contrary to expectations, many modules survived humidity/freeze cycling tests (10 cycles, 85%, 20 h at 55°C per cycle) without major degradation, demonstrating the capability of the sealing concept (see Fig. 7.8). This was also true for temperature cycling (between —5 and 55°C). However, it has
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been shown from accelerated testing (strong continuous illumination under a fluorescent lamp, including UV-B light) that UV light in particular is a serious degradation factor. Efficient UV filters are therefore recommended in order to prevent fast degradation of UV critical components in the cell .