Over 17.7% efficiency ternary-blend organic solar cells with low energy-loss and good thickness-tolerance

[Display omitted] •A 17.71% PCE is achieved in ternary OSCs with 100 nm thick active layer.•The ternary OSCs have good thickness-tolerance, benefiting for mass production.•Providing new viewpoint for understanding performance improvement of OSCs. Ternary-blend organic solar cells (TOSCs) are fabrica...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2022-01, Vol.428, p.129276, Article 129276
Main Authors: Gao, Jinhua, Ma, Xiaoling, Xu, Chunyu, Wang, Xuelin, Son, Jae Hoon, Jeong, Sang Young, Zhang, Yang, Zhang, Caixia, Wang, Kai, Niu, Lianbin, Zhang, Jian, Woo, Han Young, Zhang, Fujun
Format: Article
Language:English
Subjects:
Energy loss
Morphology optimization
Organic solar cells
Ternary strategy
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Summary:[Display omitted] •A 17.71% PCE is achieved in ternary OSCs with 100 nm thick active layer.•The ternary OSCs have good thickness-tolerance, benefiting for mass production.•Providing new viewpoint for understanding performance improvement of OSCs. Ternary-blend organic solar cells (TOSCs) are fabricated with PM6:BTP-4F-12 as the host system and IT-M as the third component. The third component IT-M takes multiple roles in improving performance of TOSCs through reducing energy-loss of the optimized TOSCs, optimizing molecular arrangement and phase separation in active-layers. The well optimized molecular arrangement and phase separation can be beneficial to charge separation and transport in TOSC, which can be confirmed by the characterization of 2D grazing incidence wide-angle X-ray scattering, transmission electron microscopy, magneto-photocurrent, as well as electrochemical impedance spectroscopy. By finely optimizing IT-M content, a power-conversion-efficiency (PCE) of 17.71% is achieved in the optimized TOSCs, benefiting from simultaneously enhanced short-circuit-current density (JSC) of 25.95 mA cm−2, open-circuit-voltage (VOC) of 0.875 V and fill-factor (FF) of 78.02% in comparison with the OSCs with PM6:BTP-4F-12 as active-layers. Furthermore, average PCE over 15% can be achieved from twenty individual TOSCs with active-layer thickness of 300 nm, indicating the optimized TOSCs have excellent thickness tolerance.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2021.129276