AS a top-tier brand in N-type technology, DAS Solar has achieved remarkable results with TOPCon 3.0 Plus, reaching a peak efficiency of up to 25.8% and a laboratory efficiency of 26.24%, which approach to the theoretical limit of crystalline silicon cells. How to improve the efficiency of crystalline silicon cells to exceed the theoretical limit of 29.4% has become a hot spot. In response, DAS Solar, in collaboration with the UNSW Advanced Photovoltaic Research Center's Martin Green team, has initiated a research project for the development of SFOS super-efficient solar cells.
The SFOS super-efficient solar cells, which are being developed in this project, have a theoretical maximum efficiency exceeding 40%. These cells will be based on DAS Solar's highly efficient silicon cell structure, which achieves an efficiency of over 26%. Additionally, a novel photoelectric conversion thin film material with singlet fission characteristics will be applied to the surface of the cells. When the incident solar photons from the sunlight spectrum interact with this material, the singlet excitations are converted into two triplet excitations, resulting in an exciton multiplication process. This leads to a quantum efficiency of the solar cells exceeding 100%, enabling the broad-spectrum utilization of solar energy and a significant boost in the current and voltage of the solar cells. Moreover, the wide availability and ease of deposition of this novel photoelectric thin film material make SFOS cells advantageous in terms of low cost and high efficiency. These characteristics align with the first principle of high cost-performance ratio that is essential for photovoltaic products.
