Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.361
Publication date: 16th December 2024
The efficiencies of tin-lead alloyed perovskite solar cell and lead-free tin perovskite solar cells are now 24-25% and 15-16%, respectively, which are still lower than that of lead perovskite solar cells. Besides the efficiency enhancement of these tin-based solar cells, stability improvement is another important research theme. In this presentation we focuse on the stability improvement of these tin-based perovskite solar cells. We learnt from the stability study of lead perovskite solar cells that ion-migration has to be suppressed for the improvement of stability. To do this for the tin-lead alloyed perovskite solar cells, Ge ions which finally cover the grain boundary as GeOx, were added to the perovskite layer. In addition, ALD SnOx layer was inserted between the electron-transporting layer (Fullerenes). The stability of the tin-lead alloyed perovskite solar cells was improved drastically. The conventional composition consisting of FTO/PEDOT-PSS/SnPb-PVK/PCBM/C60/BCP/Ag degraded to 40% of the initial efficiency after the solar cell was put in the 85 ℃ under N2 atmosphere for 200 h. The efficiency decrease of the improved solar cell was suppressed to around 5% of the initial efficiency after the sample was kept for 1000h in the same condition. It is well-known that PEDOT-PSS frequently employed as the hole-transporting layers damages the tin-based perovskite layer by the proton migration. The proton migration is somehow retarded by the GeOx. The ALD SnOx layer suppressed the iodine migration to the electron-transporting layer and the Ag electrode. In the same way, the thermal stability of the lead-free tin perovskite solar cell was improved. The efficiency of the conventional solar cells consisting of FTO/PEDOT-PSS/Sn-perovskite/C60/BCP/Ag decreased to 20% of the initial efficiency after the sample was put in the 85 ℃ under N2 atmosphere for 100 h. The decrease of the improved sample was suppressed to 20% after the sample was kept for 400 h in the same condition. It was proved that the thermal stability of the tin-based perovskite solar cells is improved by suppressing the ion migration, which is similar to that of lead perovskite solar cells.
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