STUDY OF DELAMINATION IN ACCELERATION TESTED PV MODULES

The average adhesional shear strength at silicon cell/EVA interface in damp-heat, acceleration-tested modules was ~27% of that measured in new modules. The average carbon concentration at the surface of samples extracted from acceleration tested modules was 15 atomic % or ~30% of that measured in new modules. Surface concentrations of sodium on Si-cell samples from the acceleration tested modules ranged from 4.9 to 22.0 atomic % while those of phosphorous ranged from 4.3 to 7.1 at. %. These are very high impurity concentrations. Often