Journal
ADVANCED FUNCTIONAL MATERIALS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202309484
Keywords
functional molecules; interface; passivation; perovskite solar cells; stability
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In this study, interlayer molecules with different side groups were designed to investigate the correlation between defect-passivation strength and interfacial carrier dynamics in polycrystalline perovskite. It was found that the introduction of Cl-grafted molecules or cyanide (CN) as a side group led to destructive effects and deformation of the perovskite structure. However, the incorporation of carbonyl (C=O) as the side group (TPA-O) effectively promoted carrier-collection yield and defect passivation, resulting in high efficiency and stability in perovskite solar cells. This work provides a potential strategy for improving the performance of perovskite solar cells.
Considering the high surface defects of polycrystalline perovskite, chemical passivation is effective in reducing defects-associated carrier losses. However, challenges remain in promoting passivation effects without compromising the carrier-extraction yield at the perovskite interfaces. In this work, interlayer molecules functionalized with different side groups are rationally designed to investigate the correlation between defect-passivation strength and interfacial carrier dynamics. It is revealed that Cl-grafted molecules impose destructive effects on the perovskite structure due to its lower electronegativity and mismatched spatial configuration. The introduction of cyanide (CN) as a side group in molecules also leads to perovskite deformation and unfavorable hole collection. After the molecular optimization, the incorporation of carbonyl (C=O) as the side group (TPA-O) simultaneously promotes the carrier-collection yield as well as sufficient defect passivation. As a consequence, the devices based on TPA-O yield a champion PCE of 23.25%, along with remarkable stability by remaining above 88.5% of initial performance after 2544 h storage in the air. Furthermore, this interlayer based on TAP-O enables flexible devices to achieve a high efficiency of 21.81% and promising mechanical stability. This work paves the way for further improving the performance of perovskite solar cells.
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