At Fraunhofer ISE we have well over 20 years of experience in the precise characterization and durability testing of PV modules. Throughout we continuously are adapting both our equipment and our methods to meet the new technologies. Many tandem cell technologies exhibit particularly strong spectral and capacitive effects which make it difficult to measure performance with standard flashers. To test and characterize such modules, we have high pulse duration solar simulators and a class AAA constant light solar simulator.
We already are supporting customers with reliability tests on PV modules based on tandem solar cells. Our current research work focuses on identifying the aging effects on the individual cell layers and developing meaningful characterization parameters that can be used to describe the behavior of the modules in the application as accurately as possible. This is, for example, a necessary prerequisite for the preparation of yield forecasts.