High-efficiency PERL and PERT silicon solar cells on FZ and MCZ substrates

High-efficiency PERL (passivated emitter, rear locally diffused) and PERT (passivated emitter, rear totally diffused) silicon solar cells have been fabricated on FZ and MCZ (magnetically confined Czochralski) substrates at the University of New South Wales. One of the PERL cells on FZ substrates demonstrated 24.7% efficiency at Sandia National Laboratories under the standard global AM1.5 spectrum (100 mW/cm2) at 25°C. Another PERT cell on a MCZ substrate, supplied by SEH, Japan, demonstrated 24.5% efficiency at Sandia under the same test conditions. Both these efficiencies are the highest ever reported for FZ and MCZ silicon cells, respectively. The cells made on MCZ substrates also showed stable cell performance.