Manipulating a Bilayer Transport Layer to Improve the Charge-Transport Pathway Enables Efficient Organic Solar Cells
Chaofeng Zhu , Anhai Liang , Sein Chung , Guangquan Zhang , Seojin Yun , Kang Hyuk Cho , Yanan Tang , Kilwon Cho , Zhenmin Zhao , Zhipeng Kan
Chinese Journal of Chemistry ›› 2026, Vol. 44 ›› Issue (8) : 1203 -1211.
PEDOT:PSS has been extensively employed as a hole transport layer in solution-processed organic solar cells. However, its imperfect interfacial contact and energy level mismatch with the active layer restrict charge extraction and limit device performance. Herein, we demonstrate a novel interfacial engineering strategy by depositing an ultrathin D18-Cl interlayer atop the conventional PEDOT:PSS hole transport layer. This strategy significantly improves the contact between the hole transport layer and the active layer, thereby forming a more favorable energy level alignment, thus enhancing charge extraction and reducing recombination losses. As a result, the optimized devices exhibit improved charge extraction, suppressed dark current density, and reduced charge recombination. Therefore, the binary OSCs based on PM6:Y6, PM6:BTP-eC9, and PM6:L8-BO treated with D18-Cl, achieved power conversion efficiencies of 18.93%, 19.35%, and 19.92%, respectively. In summary, this study provides a practical approach to boosting OSC performance via rational interfacial design, paving the way for high-efficiency photovoltaic technologies.
Bilayer hole transport layer / Crystallization / Vertical phase separation / Interfacial contact / Energy level mismatch / Charge transport
2026 SIOC, CAS, Shanghai, & WILEY-VCH GmbH
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