Record Broken! A New Breakthrough in Solar Cell Preparation Technology in China
On April 18, 2025, it was announced by the Ningbo Institute of Materials Technology and Engineering at the Chinese Academy of Sciences that the team led by Ye Jichun at the laboratory for optoelectronic materials and devices has successfully developed a new technology for the efficient production of flexible perovskite/CIGS (Copper Indium Gallium Selenide) tandem solar cells. This innovation achieved a certified photovoltaic conversion efficiency of 23.8% on devices measuring 1.09 square centimeters, setting a new world record for this type of solar cell. The related findings were published in the international journal Nature Energy.
Perovskite tandem solar cells are widely regarded as a significant breakthrough in next-generation photovoltaic technology due to their combination of high efficiency and low cost. Flexible CIGS tandem solar cells are particularly suitable for applications in weight-sensitive and space-constrained environments, such as drones, wearable devices, and space satellites, owing to their lightweight, high efficiency, and radiation resistance. As the “bottom layer” in the tandem structure, CIGS thin-film cells offer unique advantages for the development of flexible solar devices.
The research team introduced an innovative anti-solvent seed layer strategy, which decouples the dissolution and adsorption processes of self-assembled monolayers (SAMs) to achieve synergistic optimization of the interface and structure. Additionally, incorporating perovskite crystal seeds into the anti-solvent effectively improved the wetting behavior of the precursor solution, enhancing the crystallization quality of the thin film and ultimately ensuring a stable bond between the perovskite top cell and the CIGS bottom cell. This strategy significantly increased the preparation consistency, operational stability, and mechanical reliability of the tandem devices, providing crucial technical support for the development of flexible perovskite/CIGS tandem solar cells.
Ye Jichun stated that this new technology not only marks a significant breakthrough in the efficiency and stability of flexible tandem solar cells but also demonstrates excellent potential for large-scale production, promising to bring the next generation of high-performance solar products into real life.
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