Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 37, Pages 18173-18182Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05916k
Keywords
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Funding
- National Research Foundation of Korea (NRF) [2017R1E1A1A01074090]
- Nano Material Technology Development Program [2017M3A7B8063825]
- NRF - Ministry of Science and ICT (MSIT), Korea
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The poor oxidative stability of tin-based perovskites has been an obstacle to their widespread implementation in high-performance solar cells. Herein, quasi-two-dimensional (quasi-2D) tin-based perovskite solar cells are fabricated with significantly improved performance and stability, by introducing an additional formamidinium thiocyanate (FASCN) additive into quasi-2D tin-based perovskites. The incorporation of the FASCN additive greatly prevents quasi-2D tin-based perovskites from oxidation during film formation, through strong chemical interactions with the tin component (Sn2+). Moreover, it results in a coarser perovskite grain and a higher degree of crystallinity in the out-of-plane direction, leading to enhanced optoelectronic performance of quasi-2D tin-based perovskites. The best-performing tin-based perovskite solar cell shows an efficiency of 8.17% under reverse scan with a steady-state efficiency of 7.84% at a maximum power point (MPP), while retaining over 90% of its initial efficiency after 1000 hours in a glovebox filled with nitrogen. These results demonstrate a versatile, yet simple methodology that can be applied to other lead-free perovskites suffering from poor oxidative stability.
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