The current record for the efficiency of tandem solar cells has been broken at HZB, certifying institute European Solar Test Installation (ESTI) in Italy has confirmed.
Tandem solar cells consist of a silicon bottom cell and a perovskite top cell. In order to increase the technology's efficiency, the HZB team used an advanced perovskite composition with a smart interface modification.
Having developed an interface modification to reduce charge carrier recombination losses, the researchers applied detailed analysis to understand its specific properties.
Altogether, the interface and optical modifications enabled high photovoltages (open-circuit voltage) and resulted in the new record efficiency for tandem technology.
"This is a really big leap forward that we didn't foresee a few months ago. All the teams involved at HZB, especially the PV Competence Center and the HySPRINT Innovation lab teams have worked together successfully and with passion,"...