Surface Property Tuning of Methylammonium Lead Iodide byPlasma for Use in Planar Perovskite Solar Cells

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Authors

SHEKARGOFTAR Masoud POSPÍŠIL Jan DUGÁČEK Ján WEITER Martin HOMOLA Tomáš

Year of publication 2020
Type Article in Periodical
Magazine / Source ACS Omega
MU Faculty or unit

Faculty of Science

Citation
Web https://pubs.acs.org/doi/pdf/10.1021/acsomega.0c02179
Doi http://dx.doi.org/10.1021/acsomega.0c02179
Keywords halide perovskite; atmospheric plasma; surface treatment; photoluminescence; energy band tuning
Attached files
Description 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, CH3NH3PbI3 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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