Photoelectric conversion efficiency 30.1%! Perovskite tandem cells set a new record

Perovskite solar cells are solar cells that use perovskite-type organic metal halide semiconductors as light-absorbing materials. They belong to the third generation of solar cells, also known as new concept solar cells.

Perovskite, as a synthetic material, was first tried in the field of photovoltaic power generation in 2009. Since then, it has become popular due to its excellent performance, low cost and huge commercial value. In recent years, Oxford University, Swiss Federal Institute of Technology in Lausanne, Japan's Panasonic, Sharp, Toshiba and other top scientific research institutions and large multinational companies have invested a lot of manpower and material resources to strive to achieve mass production as soon as possible.

In February 2017, Hangzhou Xianna Optoelectronics Technology Co., Ltd. broke the world efficiency record of perovskite small modules that had been held by Japan for a long time for the first time with a conversion efficiency of 15.2%. Since then, in May and December of that year, it achieved the excellent result of breaking the world record three times in one year with a conversion efficiency of 16% and 17.4%.

In 2022, Professor Tan Hairen's research group at the School of Modern Engineering and Applied Sciences of Nanjing University and scholars from Oxford University in the UK used coating printing, vacuum deposition and other technologies to achieve the preparation of large-area all-perovskite tandem photovoltaic modules for the first time in the world. The stable photoelectric conversion efficiency of this module is as high as 21.7%, opening up a new path for the mass production and commercialization of large-area perovskite tandem cells.

On May 11, 2024, Shi Weixuan, deputy director of the office of Hubei Optics Valley Laboratory, introduced the preparation of all-perovskite tandem solar cells based on industrial compatible technology, achieving the world's leading third-party certified efficiency of 28.8%. On May 23, the all-perovskite tandem battery developed by Renshuo Solar and the research team of Nanjing University had a steady-state photoelectric conversion efficiency of 30.1%, creating a new history in the development of human photovoltaics. At the same time, Renshuo Solar actively promotes the industrialization of perovskite single-junction cells and all-perovskite tandem cells, and the internationally authoritative certified steady-state efficiency of large-area all-perovskite tandem photovoltaic modules has reached 24.8%.

The "dual carbon" goal and energy security are major national strategic decisions, and vigorously developing photovoltaic technology is of great strategic significance. The development of traditional single-junction photovoltaic technology has reached a theoretical bottleneck, so there is an urgent need to develop new ultra-efficient stacked photovoltaic technology. Although the large-scale production and long-term stability of perovskite solar cells in commercial products are still under research and improvement, the manufacturing cost of perovskite solar cells is relatively low, and the conversion efficiency has increased over the years. It is still unknown whether they will replace traditional photovoltaics in the future.