Speaker
Description
In recent years, the perovskite solar cells (PSC) have get much attention as the most promising candidates to became the primary source of renewable energy. Over the last few years the efficiency of PSC has surpassed 25%. However, the commercial potential of PSCs is still mainly limited by the low stability of perovskite active/absorbing layer to the environmental influence. It has been shown that the humidity and oxygen from the atmosphere, heat, UV light and ion migration may have harmful influences leading to the degradation of quality of material, and corollary performance and stability of the device. The reason for this weakness of perovskites is the complicacy of the material itself, which is a multielement and multi-component hybrid material. In this work, we choose poly(ionic) (PILs) liquids additives, which are polyelectrolyte salts comprising cations and anions, with the cationic or anionic centers constrained to the repeating units in the polymer chain. PILs offer several advantages (even in comparison to their monomer counterparts), including high ionic conductivity, low vapor pressure, high hydrophobicity, excellent thermal and electrochemical stability, and a tunable chemical structure. The use of TFSI-based PILs has demonstrated efficient passivation of defects at the surface of perovskite, which greatly reduces interface recombination and consequently improves device efficiency and stability for different perovskite compositions and architectures. In this work, two poly(ionic) liquids based on polymerized anion bis(trifluoromethane) sulfonamide (TFSI) (with pendant cations Li+ and imidazolium, namely [PLiMTFSI] Li and [PLiMTFSI] [DCMim]) are used as additives along with the counterpart salt LiTFSI.
| Scientific Sections | Materials |
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