Monday, July 15, 2024

Power Conversion Breakthrough Could Increase Solar Cells Efficiency

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Researchers from China have developed high-efficiency monolithic perovskite/black silicon TOPCon tandem solar cells that improve the stability of the device and increase power conversion efficiency (PCE)

The monolithic perovskite/black silicon TOPCon tandem solar cells (Credit: NIMTE)

It is difficult to improve the performance of solar cells as they need huge investments and had limited light-trapping capabilities. Perovskite/silicon tandems offer an increase in the PCE of solar cells at a relatively low cost. Hence, a research group led by Prof. Ye Jichun at the Ningbo Institute of Materials Technology and Engineering (NIMTE) of the Chinese Academy of Sciences (CAS) has developed high-performance monolithic perovskite/black silicon (b-Si) solar cells with tunnel oxide passivated contact (TOPCon) that enabled them to achieve a certified power conversion efficiency (PCE) of 28.2%.

This first monolithic perovskite/Si tandem solar cell is based on industry-relevant b-Si with TOPCon structures. Combined with the TOPCon, the surface reconstruction of the b-Si contributes to an excellent trade-off between high-level surface passivation and broadband light trapping. The reconstructed nanotexture of b-Si can significantly increase the moisture resistance and promote the wetting of perovskite. The b-Si also guides the vertically aligned crystal growth of perovskite through the nanoconfinement effect, reducing carrier recombination and facilitating carrier collection. Further, b-Si reduces the film strains, thus improving the stability of the device.

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With an open-circuit voltage of 1.80 V, fill factor of 81.8%, and a short-circuit current density of 19.2 mA/cm2, the prepared monolithic perovskite/b-Si TOPCon tandem solar cells yield a remarkably high certified PCE of 28.2%, which is among the highest reported values for perovskite/Si solar cells with either TOPCon or double-side-textured Si to date.

The research will assist in the development and fabrication of high-performance perovskite/b-Si tandem solar cells.

Click here for the Published Research Paper


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