Extended Data Fig. 3: Performance of control and CF3-PA mixed Pb-Sn perovskite solar cells with various absorber thicknesses. | Nature

Extended Data Fig. 3: Performance of control and CF3-PA mixed Pb-Sn perovskite solar cells with various absorber thicknesses.

From: All-perovskite tandem solar cells with improved grain surface passivation

Extended Data Fig. 3

For regular thinner Pb-Sn perovskite solar cells (thicknesses of 750 and 900 nm), the diffusion lengths are sufficiently long to ensure charge transport within devices. This agrees with the finding that no obvious improvement was observed in regular thinner devices after we added the CF3-PA passivating agent. The abrupt drop in performance at the thickness of 1.45 μm comes because the precursor solution fails to form high-quality films, a result of finite solubility of metal halides in DMF/DMSO solvent.

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