Thin-film OPV firm, Dyesol has undertaken light soaking testing of its small substrate-sized lab-based perovskite solar cells.
The company said that it used batches of strip cells (1 cm2 size) with around 10% conversion efficiencies that had been encapsulated (not specified as glass or plastic) and subjected to continuous light soaking at full sun intensity for over 1,000 hours.
Dyesol claimed that the testing showed the cells had efficiency degradations below 10%. The results were not said to have been verified by a third party testing house.
The company also claimed that because the accelerated test conditions resulted in less than 10% relative conversion efficiency degradation proved that the cells were inherently photo-stable.
However, as the company noted, the light soaking test is only a sub-part of meeting the IEC 61646 testing standard for thin-film modules, where under a range of testing power output of a module, rather than a cell, should not degrade after final light soaking of no less than 90% of the minimum value specified by the manufacturer.
Dyesol said that it would continue to focus on stability work as well as other stability validation tests for perovskite solar cells.