New designs for perovskite-silicon solar cells have reached a conversion efficiency of 27.7 percent.

The use of solar photovoltaic cells as a renewable energy source is booming, as the technology becomes more efficient and less expensive. Stacking perovskite solar cells on top of silicon ones is one way to increase the amount of sunlight harnessed, and now researchers at Australian National University (ANU) have broken a new efficiency record for these tandem solar cells.

Already outperforming most commercially available solar cells, which hover around the 20-percent efficiency mark, these are based solely on silicon, and that technology is expected to bump up against its maximum upper limit in the next few years.

Read more: New tandem perovskite-silicon solar cell breaks efficiency record (