High-efficiency polycrystalline silicon double-glass components

Although the conventional monolayer polycrystalline silicon method is highly effective in TOPCon solar cells, it is limited by doping inhomogeneity, which impairs the passivation and electrical properties, and the cell's photovoltaic conversion efficiency remains suboptimal.

Finally, an industrial-scale TOPCon solar cell based on the double poly-Si/SiO x structure achieved an average conversion efficiency of 24.73 %, 0.23 % higher than the baseline production TOPCon cell at 24.50 %.

The commercial crystalline silicon photovoltaic cells exhibit an efficiency ranging from 12 % to 19 % .

Electrical performance test data using bilayer polysilicon/silicon oxide structured solar cells and baseline structured solar cells, samples from different experimental groups are denoted by S1, S2, and S3, respectively.

A promising alternative is the poly-crystalline silicon (poly-Si) stack consisting of poly-Si(p+)/poly-Si(n+), which is based on a tunnel oxide passivating contact (TOPCon) bot-tom sub-cell and can offer excellent passivation and contact prop-erties simultaneously, therefore holding tremendous potential for use in perovskite/c-Si TSCs22,23.

These observations reinforce the importance of the double poly-Si/SiO x design for P-doped polysilicon, effectively slowing down the diffusion of P into the underlying polysilicon layer, resulting in more uniform and controllable doping levels of the underlying polysilicon and enhanced passivation.