[1PS-001]
우수논문발표상 응모자Charge Transport and Stability Mechanisms of Non-Halogenated Phenothiazine Self-Assembled Monolayers for 19.7% Efficient Organic Solar Cells
발표자Qurrotun Ayuni Khoirun Nisa (부경대학교)
연구책임자김주현 (부경대학교)
Abstract
Organic solar cells (OSCs) offer advantages in flexibility, low cost, and solution processability, but the instability of conventional hole transport layers (HTLs) remains a major limitation. However, carbazole-based Self assembled monolayers (SAMs) often exhibit poor packing and photooxidative degradation. In this study, a non-halogenated phenothiazine-based SAM, [(4-(10H-phenothiazin-10-yl)butyl)phosphonic acid] (PZPA), is introduced to improve hole extraction and interfacial stability. The sulfur-containing phenothiazine core downshifts the HOMO level, enhances charge delocalization, and enables the formation of compact and ordered monolayer on ITO. Devices based on PM6:Y6BO achieve a power conversion efficiency of 18.2% with excellent thermal and UV stability, showing only 1.09% degradation under prolonged illumination. Moreover, PM6:L8-BO devices reach a PCE of 19.7%, highlighting phenothiazine-derived SAMs as efficient interfacial materials for high-performance OSCs.