Scientists in China built a four-terminal perovskite-CIGS tandem solar cell based on a top semi-transparent perovskite device with an efficiency of 21.26% and a high bifaciality factor of 92.2%.

In April, a group of researchers from UNIST and the Swiss Federal Institute of Technology Lausanne (EPFL) achieved a conversion efficiency of 25.6% in a single-junction perovskite solar cell.

Dr Imalka Jayawardena, from Surrey's Advanced Technology Institute, said: "By addressing these common challenges we see with perovskite solar technology, our research blows the doors wide open for ...