January 30 (Renewables Now) - Scientists at Helmholtz-Zentrum Berlin fuer Materialien und Energie (HZB) have achieved 29.15% conversion efficiency with a perovskite/silicon tandem solar cell.
Two groups led by Bernd Stannowski and Steve Albrecht worked on the cell. They now aim to surpass 30% efficiency and are already discussing initial ideas in that direction, according to a press release by HZB on Wednesday.
The CalLab of the Fraunhofer Institute for Solar Energy Systems (ISE) has certified the 29.15% result for the tandem cell, which has a size of one square centimetre. The research centre said the processes used to build that cell are suitable in principle for large surface areas. Initial tests have shown that scaling up with the help of vacuum deposition processes is “very promising”.
The realistic practical efficiency limit for perovskite/silicon tandem cells is believed to be about 35%.