Facile Spontaneous Perovskite Passivation Driven by Rapid Chemisorption

Engineering notes

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Chinese explanation / 中文解读

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Original abstract

Recent progress in perovskite solar cells (PSCs) has been marked by the emergence of spontaneous heterointerface modulators (SHMs), represented by alkylammonium bis(trifluoromethanesulfonyl)imide (RA–TFSI) spontaneous perovskite passivators. These SHMs operate during hole-transport material (HTM) deposition, where RA cations in RA–TFSIcontaining HTM solutions spontaneously passivate defects on perovskite surfaces. Accordingly, this spontaneous passivation strategy bypasses the conventional perovskite passivation process and circumvents the risk of atmospheric contamination of modulated interfaces. However, as RA–TFSI spontaneous passivators are in their infancy, clarifying their functionality is crucial for establishing their practical benefits. In this work, we verify that spontaneous perovskite passivation is driven by the rapid chemisorption of RA cations. Even rapid deposition of an HTM solution containing an RA–TFSI—with only a few seconds of contact with the perovskite surface—produced samples with comparable characteristics, such that the photovoltaic performance of PSCs was similar to that of the sample obtained by HTM deposition with a waiting time. The obtained insights not only highlight RA–TFSI spontaneous perovskite passivators as recent notable progress in PSCs, but also advance our understanding of perovskite-surface reactivity—an essential factor for the successful industrial deployment of PSCs.

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