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FA/MA Cation Exchange for Efficient and Reproducible Tin-Based Perovskite Solar Cells.

Fangjie LiXiaoyi HouZhen WangXiaxia CuiGuohua XieFeng YanXing-Zhong ZhaoQidong Tai
Published in: ACS applied materials & interfaces (2021)
Nontoxic tin-based perovskite solar cells (Sn-PSCs) as a promising alternative to toxic Pb-PSCs have drawn great attention in recent years for their environmental friendliness and unique optoelectronic properties. However, both the efficiency and long-term stability of Sn-PSCs are considerably inferior to those of Pb-based ones. One of the main reasons is the difficulty in obtaining high-quality Sn-perovskite films due to the rapid crystallization of Sn-perovskites, which also results in poor device reproducibility. Here, we report a novel cation exchange strategy to prepare high-quality formamidinium tin triiodide (FASnI3) perovskite films with a better controlled crystallization process and improved reproducibility, which allows easy access to smooth and pinhole-free perovskite films with oriented crystal growth, enlarged grain size, and reduced trap-state density. The corresponding Sn-PSCs show excellent photovoltaic performance with a champion efficiency of 9.11%, comparable to the best results reported for FASnI3-PSCs, and the devices also demonstrate outstanding long-term stability without encapsulation. Our results offer a practical strategy for fabricating Sn-PSCs with superb performance and stability.
Keyphrases
  • perovskite solar cells
  • room temperature
  • ionic liquid
  • solar cells
  • heavy metals
  • high efficiency
  • risk assessment
  • quantum dots
  • loop mediated isothermal amplification