From 20% single-junction organic photovoltaics to 26% perovskite/organic tandem solar cells: self-assembled hole transport molecules matter
Sun X. Wang F. Yang G. Ding X. Lv J. Sun Y. Wang T. Gao C. Zhang G. Liu W. Xu X. Satapathi S. Ouyang X. Ng A. Ye L. Yuan M. Zhang H. Hu H.
23 January 2025Royal Society of Chemistry
Energy and Environmental Science
2025#18Issue 52536 - 2545 pp.
Achieving high efficiency in single-junction organic solar cells (OSCs) and tandem solar cells (TSCs) significantly relies on hole transport layers constructed from self-assembled molecules (SAMs) with a well-ordered, face-on alignment. In this study, we enhanced the ordered stacking of a SAM layer by leveraging the interaction between the π-conjugated backbone of SAMs and volatile solid additives with opposing electrostatic potentials. This approach induced a highly ordered stacking of the SAM layer, as confirmed by the presence of multiple X-ray scattering peaks and an increased Herman orientation factor from 0.402 to 0.726 after the evaporation of solid additives. This optimization not only strengthened hole transport properties but also positively influenced the film formation kinetics of the upper active layer, improving morphology and vertical phase separation. As a result, we achieved a notable power conversion efficiency (PCE) of 20.06% (certified 19.24%) in PM6:BTP-eC9 binary OSCs, with a further breakthrough PCE of 26.09% in perovskite-organic tandem solar cells (TSCs).
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Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 7098 Liuxian Boulevard, Shenzhen, 518055, China
School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China
College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, 518118, China
Research Center for New Energy Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China
Indian Institute of Technology Roorkee, Uttarakhand, 247667, India
Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, 010000, Kazakhstan
School of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, 300350, China
College of Chemistry, Nankai University, Tianjin, China
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
Hoffmann Institute of Advanced Materials
School of Materials Science and Engineering
College of New Materials and New Energies
Research Center for New Energy Technology
Indian Institute of Technology Roorkee
Department of Electrical and Computer Engineering
School of Materials Science & Engineering
College of Chemistry
State Key Laboratory of Supramolecular Structure and Materials
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