Recently, researchers from the Institute of Chemistry, Chinese Academy of Sciences, along with the teams of Li Yongfang and Meng Lei from the Beijing National Molecular Science Center, collaborated with Professor Felix Lang from the University of Potsdam, Germany, achieving significant progress in the field of perovskite/organic tandem solar cells. The team realized a wide-bandgap perovskite solar cell with an open-circuit voltage of 1.36 V and a photoelectric conversion efficiency greater than 18% (the increase in open-circuit voltage is a key factor in improving the efficiency of perovskite/organic tandem solar cells).
The team combined the wide-bandgap perovskite solar cell with an organic solar cell to construct a perovskite/organic tandem solar cell, achieving a photoelectric conversion efficiency of 26.4% (certified by a third party as 25.7%). This achievement represents the highest efficiency for this type of tandem solar cell to date and provides a new approach to reducing voltage loss in wide-bandgap perovskite solar cells, which will strongly promote the development of perovskite/organic tandem solar cells. This research result was recently published in the international academic journal *Nature*.
Solar cells are a key technology for converting solar energy into electrical energy and have long been a hot topic in the research and application of clean energy. Among them, the next-generation solar cells represented by perovskite solar cells and organic solar cells, which can be manufactured using solution printing, offer advantages such as easy preparation, lightweight, and the ability to be made into flexible devices. They complement the current large-scale commercial applications of crystalline silicon solar cells and have significant application prospects in portable energy, building-integrated photovoltaics, and indoor photovoltaics. In recent years, their energy conversion efficiency has also rapidly improved. As an emerging technology, perovskite/organic tandem solar cells have attracted considerable attention, as their structure can effectively enhance efficiency while significantly improving device stability.