期刊
SMALL
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202302418
关键词
amphoteric ions; crystallinity; defect passivation; morphology; tin-based perovskite solar cells
This study found that l-Asparagine as a zwitterion plays a dual role in controlling the nucleation/crystallization process and improving the morphology of tin perovskite film, leading to enhanced efficiency and stability in solar cells. This work provides a facile and efficient approach to controlling the crystallization and morphology of tin-based perovskite film, and offers guidelines for further improved performance of tin-based perovskite electronic devices.
Despite the optoelectronic similarities between tin and lead halide perovskites, the performance of tin-based perovskite solar cells remains far behind, with the highest reported efficiency to date being approximate to 14%. This is highly correlated to the instability of tin halide perovskite, as well as the rapid crystallization behavior in perovskite film formation. In this work, l-Asparagine as a zwitterion plays a dual role in controlling the nucleation/crystallization process and improving the morphology of perovskite film. Furthermore, tin perovskites with l-Asparagine show more favorable energy-level matching, enhancing the charge extraction and minimizing the charge recombination, leading to an enhanced power conversion efficiency of 13.31% (from 10.54% without l-Asparagine) with remarkable stability. These results are also in good agreement with the density functional theory calculations. This work not only provides a facile and efficient approach to controlling the crystallization and morphology of perovskite film but also offers guidelines for further improved performance of tin-based perovskite electronic devices.
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