Synergistic Buried Interface Engineering for Stable Perovskite Solar Cells

Min Hsuan Tsai^a, Heng Yi Lin^a, Shi-Chun Liu^a, Chieh-Ting Lin^a

^aDepartment of Chemical Engineering National Chung Hsing University

Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP26)

Nagoya, Japan, 2026 January 13th - 15th

Organizers: Pablo P. Boix and Seigo Ito

Oral, Min Hsuan Tsai, presentation 022
Publication date: 5th November 2025

Defects and voids at the buried interface of perovskite films critically limit charge extraction and reproducibility in self-assembled monolayer (SAM)–based inverted perovskite solar cells (PSCs). In this work, we present a synergistic buried-interface engineering strategy that combines MACl additive regulation and PFN-Br interlayer modification to simultaneously enhance perovskite crystallization and interfacial energetics. Incorporating MACl promotes oriented crystal growth and suppresses interfacial strain, yielding compact films with reduced defect density.^1,2 Complementarily, the introduction of an amphiphilic conjugated polyelectrolyte (PFN-Br) between the MeO-2PACz SAM and perovskite layers effectively covers uncovered ITO regions and mitigates interfacial void formation.^3–5 Conductive AFM and cross-sectional SEM confirm the elimination of buried voids, while photoemission analyses reveal favorable interfacial band bending that facilitates charge separation and suppresses recombination. Consequently, the optimized devices achieve a stabilized power conversion efficiency of 22.5% with an exceptional fill factor of 0.84 and outstanding reproducibility (standard deviation < 0.01). This study highlights that fine-tuning buried interfaces through cooperative chemical passivation and energetic alignment is a key route toward scalable, stable, and high-performance SAM-based perovskite photovoltaics.

References:

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[3] Magomedov, A.; Al-Ashouri, A.; Kasparavičius, E.; Strazdaite, S.; Niaura, G.; Jošt, M.; Malinauskas, T.; Albrecht, S.; Getautis, V. Self-Assembled Hole Transporting Monolayer for Highly Efficient Perovskite Solar Cells. Adv. Energy Mater. 2018, 8 (32), 1801892.

[4] Phung, N.; Guo, F.; Belaidi, A.; Wagner, P.; Abate, A. Enhanced Self-Assembled Monolayer Surface Coverage by ALD NiO in p–i–n Perovskite Solar Cells. ACS Appl. Mater. Interfaces 2022, 14 (1), 2166–2176.

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