Record Broken! A new breakthrough has been achieved in flexible perovskite/CIGS tandem solar cells in China. On April 18, the Ningbo Institute of Materials Technology and Engineering, under the Chinese Academy of Sciences, announced that a team led by Ye Jichun successfully developed a new technology for the efficient fabrication of flexible perovskite/CIGS tandem cells. This innovation has resulted in a certified photoelectric conversion efficiency of 23.8% on a device measuring 1.09 square centimeters, setting a new world record for this type of solar cell. The related findings have been published in the international journal Nature Energy.
Perovskite tandem 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 cells, being lightweight, efficient, and radiation-resistant, are particularly suitable for applications in space-constrained and weight-sensitive areas such as drones, wearable devices, and space satellites. CIGS thin-film cells serve as the "bottom layer" in the tandem structure, providing unique advantages for the development of flexible solar devices.
The research team introduced an innovative anti-solvent seed layer strategy that decouples the dissolution and adsorption processes of self-assembled monolayers (SAMs), achieving a synergistic optimization of the interface and structure. Additionally, incorporating perovskite crystal seeds into the anti-solvent significantly improved the wetting behavior of the precursor solution and enhanced the crystallization quality of the thin film. This ultimately resulted in a stable integration of the perovskite top cell with the CIGS bottom cell. This strategy has markedly improved the consistency, operational stability, and mechanical reliability of the tandem devices, providing crucial technical support for the advancement of flexible perovskite/CIGS tandem solar cells.
Ye Jichun expressed that this new technology not only represents a significant breakthrough in the efficiency and stability of flexible tandem solar cells but also possesses promising potential for scalable production, which could facilitate the practical application of the next generation of high-performance solar products.
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