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Bay-Site Hydrogen-Bond Engineering of Perylene Diimide Cathode Interlayers for Efficient and Durable Organic Solar Cells
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DOI：10.1002/adfm.77596.png)
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Abstract
En 中文
Cathode interlayers (CILs) are critical to the efficiency and stability of organic solar cells (OSCs), yet conventional small-molecule CILs often suffer from excessive aggregation, weak interfacial adhesion, and radical-induced degradation. Here, we demonstrate a bay-site hydrogen-bond engineering strategy to address these limitations. Two CILs, PDIN-B and PDIN-BOH, were developed by introducing phenyl and phenolic hydroxyl-functionalized substituents at the perylene diimide (PDI) bay positions. Bay substitution suppresses aggregation and improves energy-level alignment, while the hydroxyl groups in PDIN-BOH form a robust hydrogen-bonding network that locks interfacial morphology, strengthens adhesion with the acceptor L8-BO, and suppresses radical generation to mitigate photothermal degradation, a behavior distinctly different from conventional side-chain functionalization, which often promotes radical-induced damage. Consequently, PDIN-BOH-based devices achieve a power conversion efficiency of 20.37% and retain 80.33% of initial performance after 1523 h of continuous one-sun illumination at 65°C under the International Summit on Organic Photovoltaic Stability (ISOS-L-2) protocol, representing a notable demonstration of exceptional durability under coupled photothermal aging. This work establishes bay-site hydrogen-bond engineering as a rational design principle for durable organic photovoltaics.
Keywords:
bay-site hydrogen-bond engineering
cathode interface layer
organic solar cells
perylene diimide
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19
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3.4W
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32.1W
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