Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
The rapid advancement of metal halide perovskite solar cells (PSCs) has seen their power conversion efficiencies rise to 26.1% over the span of a decade. Nevertheless, the challenge of ensuring long-term stability remains a critical obstacle to their commercial competitiveness. Interfaces in the device are considered a cause of degradation of PSCs. Herein, we propose using amino acids and short sequences of amino acids as peptides to protect the perovskite interfaces towards improved photostability of PSCs. Stability tests were applied to encapsulated devices both indoors, under constant simulated sunlight, as well as outdoors. Interface modification with peptides containing indole and carboxylic functional groups were found to improve both the efficiency and the photostability of the devices compared to control devices and compared to devices modified with peptides containing indole and amino functional groups. The results were compared to the effect of the corresponding single amino acids on the PSC stability, further demonstrating the beneficial effect of the indole functional group, as well as the significance of the interplay between different functional groups in the synthesized peptide.
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