The demand for cheap
and green energy as a replacement for fossil
fuels has never been greater, and perovskite solar cells (PSCs) are
among the leading means of meeting it. The surface properties of metal
halide perovskite layers play crucial roles in the performance and
durability of such cells. Consequently, a wide range of engineering
processes for surface modification of perovskite layers has been investigated
and among them is atmospheric pressure plasma (APP). Nevertheless,
knowledge of the interaction between plasma and perovskite layers
is still far from complete. In this work, CH
3
NH
3
PbI
3
films were subjected to APP generated by a portable
plasma source. A detailed understanding of band energy after plasma
treatment is crucial to the investigation of the behavior of the perovskite
layer. This study demonstrates a remarkable shift in the valence and
conduction bands of a perovskite layer after plasma treatment, while
band gap energy remains relatively constant. We found that short plasma
treatment of perovskite layers resulted in higher performance and
stability of PSCs.
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