Aniline-based Anode Interfacial Layer Containing Fluorinated Protonic Acid Dopant for High-Efficiency and Ambient Stable Organic Solar Cells
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초록
내용
The choice of interfacial layers in organic solar cells (OSCs) is important for enhancing their power conversion efficiency (PCE) and stability. PEDOT:PSS is the most widely used hole transport layer (HTL); however, device stability is often severely degraded, owing to the strong acidity and hygroscopicity of PEDOT:PSS. Herein, we report a new efficient HTL system comprising an oligo(aniline) host (PBD) and a protonic acid dopant (PFBSA), and demonstrate its use in OSC devices. Desirable properties like high transmittance, excellent conductivity, and appropriate work function establish the suitability of the PBD:PFBSA film as an HTL. Thus, a PBD:PFBSA HTL is employed in the PM6:Y6-based OSC system to achieve a PCE of 15.24%. Importantly, the PBD:PFBSA HTL-based OSC exhibits significantly higher device stability than the PEDOT:PSS HTL. Our results highlight the successful design of an oligo(aniline)-based material and its practical application as an effective HTL for OSCs.