Intrinsic and extrinsic stability of triple-cation perovskite solar cells through synergistic influence of organic additive

Mali, Sawanta S. and Patil, Jyoti V. and Park, Dae Woong and Jung, Young Hee and Hong, Chang Kook (2022) Intrinsic and extrinsic stability of triple-cation perovskite solar cells through synergistic influence of organic additive. Cell Reports Physical Science, 3 (6). 100906. ISSN 2666-3864 (https://doi.org/10.1016/j.xcrp.2022.100906)

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Abstract

Surface- or bulk-passivation using organic additives plays a critical role in improving the performance and stability of hybrid perovskite solar cells (HPSCs). Here, we report 2-hydroxyethyl acrylate (HEA) as an additive to reduce crystallization and passivate defects. Because of the dual functionality of the HEA additive, the optimized HPSCs yield 22.05% and 21.46% power conversion efficiency (PCE), respectively, for mesostructured negative-intrinsic-positive (n-i-p)- and planar positive-intrinsic-negative (p-i-n)-type device configurations, which is much higher than control devices. Large devices with 1 cm2 active area also produce a promising 20.03% PCE, which is comparable to the current efficiency. Time-of-flight secondary ion mass spectroscopy (TOF-SIMS) measurement analysis indicates the HEA settles not only in grain boundaries but also within the perovskite grain, which facilitates passivation and suppresses halogen-ion migration. Importantly, photostability analysis reveals negligible efficiency loss over 1,000 h under continuous 1 sun illumination under different environmental conditions.

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