Boron-oxygen related defects in Cz-silicon solar cells degradation, regeneration and beyond

This contribution addresses the stability of Cz-Si solar cells subsequent to the so called Regeneration process which virtually eliminates the losses due to the well known boron-oxygen related defect. The stability of the regenerated state is vital for the industrial application of the Regeneration process. As recent experiments have shown, at least one sample was instable after the completed Degradation-Regeneration cycle at elevated temperatures. However, this instability was not found for other samples investigated. Furthermore, different possible interpretations of this instability are discussed