Fabrication of large-area formamidine (FA)-based perovskite solar cells
is considered to be one of the most promising paths towards its commercialization. However, the phase stability of FA-based perovskites is poor at room temperature, which also increases the difficulty of their large-area preparation. Recently, the team of Lin Hong from Tsinghua University and Li Xin from Xiamen University published a paper in the internationally renowned journal Small Methods
. This work realized the crystallization regulation of FA-based perovskites in the process of large-area coating by introducing a natural amino acid. Thus, large-area perovskite
films with larger grain sizes were obtained.
Meanwhile, the amino acid strongly interacts with the uncoordinated lead ions in the perovskite, effectively passivating the defects in the perovskite body and inhibiting the non-radiative recombination. Rigid and flexible perovskite solar cells based on the blade coating method achieved photoelectric conversion efficiencies of 21.95% and 20.21%, respectively. At the same time, amino acid-based perovskite solar cells also exhibit good stability, and the unpackaged devices can still maintain more than 95% of their initial efficiency after being stored at 20 °C for 1000 hours.
In addition, the team prepared flexible large-area perovskite solar modules with areas of 185 and 333 cm 2 through the slit coating method, and their photoelectric conversion efficiencies reached 12.1% and 11.2%, maintaining the leading level in the world. This strategy paves the way for large-scale production of flexible perovskite solar cells and modules.
Ziyi Wu, Xuanling Liu, Han Zhong, Zhihao Wu, Hao Chen, Jiazheng Su, Youcheng Xu, Xuanyu Wang, Xin Li*, Hong Lin*, Natural Amino Acid Enables Scalable Fabrication of High-Performance Flexible Perovskite Solar Cells and Modules with Areas over 300 cm2. Small Methods,2022, 2200669.
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