Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
The stability of metal halide perovskite solar cells is strongly influenced by interfacial processes, particularly under thermal and moisture stress, where interfacial degradation can compromise charge transport and long-term device performance. Here, two site-selectively fluorinated bathocuproine derivatives (BCP-m2F and BCP-m4F) are introduced as interfacial buffer layers to improve interfacial properties and device stability. Although fluorination induces only minor changes in energy-level alignment, it significantly modifies film morphology, electrostatic properties, and surface energy, highlighting the importance of molecular fluorination patterns in controlling interfacial functionality. Notably, BCP-m4F forms more uniform films with enhanced electrical conductivity, which contributes to suppressed trap-assisted recombination and more efficient charge extraction. Despite comparable overall photovoltaic performance, devices incorporating BCP-m4F exhibit superior light-intensity-dependent behavior, suggesting improved charge collection under low-light conditions. Furthermore, the increased hydrophobicity of the fluorinated interlayer helps suppress moisture ingress, resulting in enhanced stability under damp heat conditions (ISOS-D3, 85 °C/85% RH). These findings demonstrate that site-selective fluorination provides an effective strategy for simultaneously improving interfacial charge transport, moisture resistance, and the operational reliability of perovskite solar cells.
J.-Y.S. acknowledges support from the Ministry of Trade, Industry and Energy (MOTIE) and the Korea Institute for Advancement of Technology (KIAT) through the International Cooperative R&D Program (P0026100), and from the Ministry of Science and ICT (MSIT) of the Korean Government (RS-2024-00406152). J.J. acknowledges support from the National Research Foundation of Korea (NRF) funded by MSIT (RS-2023-00220748). This work was also supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by MOTIE (RS-2023-00303745) and the 4th BK21 Education and Research Division for Energy Convergence Technology. The laser scribing system at Pusan National University was used in this work.
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