Issue

Vol. 16 (2024)

Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2% Efficiency Ortho-Xylene Processed Organic Solar Cells

https://doi.org/10.1007/s40820-023-01241-z
Bosen Zou
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, People’s Republic of China
Weiwei Wu
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, People’s Republic of China
Top Archie Dela Peña
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, People’s Republic of China
Ruijie Ma
Department of Electronic and Information Engineering, Research Institute for Smart Energy (RISE), Guangdong‑Hong Kong‑Macao (GHM) Joint Laboratory for Photonic‑Thermal‑Electrical Energy Materials and Devices, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, People’s Republic of China
Yongmin Luo
The Hong Kong University of Science and Technology, Function Hub, Advanced Materials Thrust, NanshaGuangzhou 511400, People’s Republic of China
Yulong Hai
The Hong Kong University of Science and Technology, Function Hub, Advanced Materials Thrust, NanshaGuangzhou 511400, People’s Republic of China
Xiyun Xie
Department of Electronic and Information Engineering, Research Institute for Smart Energy (RISE), Guangdong‑Hong Kong‑Macao (GHM) Joint Laboratory for Photonic‑Thermal‑Electrical Energy Materials and Devices, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, People’s Republic of China
Mingjie Li
Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, People’s Republic of China
Zhenghui Luo
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China
Jiaying Wu
The Hong Kong University of Science and Technology, Function Hub, Advanced Materials Thrust, NanshaGuangzhou 511400, People’s Republic of China
Chuluo Yang
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, People’s Republic of China
Gang Li
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, People’s Republic of China
He Yan
Department of Chemistry Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, People’s Republic of China

Corresponding Author: He Yan

hyan@ust.hk

Nano-Micro Letters, Vol. 16 (2024), Article Number: 30

Abstract

With plenty of popular and effective ternary organic solar cells (OSCs) construction strategies proposed and applied, its power conversion efficiencies (PCEs) have come to a new level of over 19% in single-junction devices. However, previous studies are heavily based in chloroform (CF) leaving behind substantial knowledge deficiencies in understanding the influence of solvent choice when introducing a third component. Herein, we present a case where a newly designed asymmetric small molecular acceptor using fluoro-methoxylated end-group modification strategy, named BTP-BO-3FO with enlarged bandgap, brings different morphological evolution and performance improvement effect on host system PM6:BTP-eC9, processed by CF and ortho-xylene (o-XY). With detailed analyses supported by a series of experiments, the best PCE of 19.24% for green solvent-processed OSCs is found to be a fruit of finely tuned crystalline ordering and general aggregation motif, which furthermore nourishes a favorable charge generation and recombination behavior. Likewise, over 19% PCE can be achieved by replacing spin-coating with blade coating for active layer deposition. This work focuses on understanding the commonly met yet frequently ignored issues when building ternary blends to demonstrate cutting-edge device performance, hence, will be instructive to other ternary OSC works in the future.


Highlights:
1 A novel fluoro-methoxylated end group for Y-series acceptors is produced, and asymmetric substitution strategy is applied as a step-by-step optimization.
2 19.24% power conversion efficiency is achieved for industrially compatible solvent ortho-xylene processed organic solar cells.
2 Underlying morphological and photo-physical variation is revealed for device performance difference brought by solvent selection, which could set up a template for future research on similar topics.

Keywords

Organic solar cells Ternary design Solvent selection Flouro-methoxylated end group Morphological ordering
Zou, Bosen, Weiwei Wu, Top Archie Dela Peña, Ruijie Ma, Yongmin Luo, Yulong Hai, Xiyun Xie, Mingjie Li, Zhenghui Luo, Jiaying Wu, Chuluo Yang, Gang Li, and He Yan. 2023. “Step-by-Step Modulation of Crystalline Features and Exciton Kinetics for 19.2% Efficiency Ortho-Xylene Processed Organic Solar Cells”. Nano-Micro Letters 16 (November):30. https://doi.org/10.1007/s40820-023-01241-z.
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