POS6-0425
Site-Selective Fluorination of Bathocuproine Derivatives for Enhanced Performance and Stability in Perovskite Solar Cells
Topic
S6. Emerging Polymer and Hybrid Materials for Advanced Energy Storage and Conversion
When and Where
Sep 29, 2026
08:30 - 09:30
Room 301 (Grand Ballroom)
Session Chairs
Hae Jung SON
Boseok KANG
Presenter(s)
Dong-Geon Kwun (Pusan National Univ)
Co-Author(s)
Abstract
Stability remains a key challenge in metal halide perovskite solar cells, particularly due to interfacial degradation under thermal and moisture stress. The interface between the electron transport layer and the metal electrode plays a critical role in both charge extraction and operational stability. In this study, two site-selectively fluorinated bathocuproine derivatives, BCP-m2F and BCP-m4F, are investigated as interfacial buffer layers and compared with a previously reported aryl-substituted derivative (BCP-m1).
Although fluorination induces only minor changes in energy-level alignment, it significantly affects film morphology and interfacial properties. BCP-m4F forms more uniform films and exhibits higher electrical conductivity than BCP-m2F, leading to reduced trap-assisted recombination and improved charge extraction, as supported by time-resolved photoluminescence, J–V analysis, and impedance spectroscopy. Contact angle measurements indicate increased hydrophobicity for the fluorinated derivatives.
Under damp heat conditions (ISOS-D3, 85 °C/85% RH), devices incorporating BCP-m4F show slower performance degradation. Light-intensity-dependent measurements further reveal reduced open-circuit voltage loss under low-light conditions. Overall, the results demonstrate that site-selective fluorination of buffer layers influences interfacial morphology, recombination behavior, and environmental stability in perovskite solar cells.
Although fluorination induces only minor changes in energy-level alignment, it significantly affects film morphology and interfacial properties. BCP-m4F forms more uniform films and exhibits higher electrical conductivity than BCP-m2F, leading to reduced trap-assisted recombination and improved charge extraction, as supported by time-resolved photoluminescence, J–V analysis, and impedance spectroscopy. Contact angle measurements indicate increased hydrophobicity for the fluorinated derivatives.
Under damp heat conditions (ISOS-D3, 85 °C/85% RH), devices incorporating BCP-m4F show slower performance degradation. Light-intensity-dependent measurements further reveal reduced open-circuit voltage loss under low-light conditions. Overall, the results demonstrate that site-selective fluorination of buffer layers influences interfacial morphology, recombination behavior, and environmental stability in perovskite solar cells.
