Co-adsorbed self-assembled monolayer enables high-performance perovskite and organic solar cells

Dongyang Li, Qing Lian, Tao Du, Ruijie Ma (), Heng Liu, Qiong Liang, Yu Han, Guojun Mi, Ouwen Peng, Guihua Zhang, Wenbo Peng, Baomin Xu, Xinhui Lu, Kuan Liu, Jun Yin, Zhiwei Ren (), Gang Li () and Chun Cheng ()
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Dongyang Li: Southern University of Science and Technology
Qing Lian: Southern University of Science and Technology
Tao Du: The Hong Kong Polytechnic University
Ruijie Ma: The Hong Kong Polytechnic University, Hung Hom
Heng Liu: The Chinese University of Hong Kong
Qiong Liang: The Hong Kong Polytechnic University, Hung Hom
Yu Han: The Hong Kong Polytechnic University, Hung Hom
Guojun Mi: Southern University of Science and Technology
Ouwen Peng: Southern University of Science and Technology
Guihua Zhang: Southern University of Science and Technology
Wenbo Peng: Southern University of Science and Technology
Baomin Xu: Southern University of Science and Technology
Xinhui Lu: The Chinese University of Hong Kong
Kuan Liu: The Hong Kong Polytechnic University, Hung Hom
Jun Yin: The Hong Kong Polytechnic University
Zhiwei Ren: The Hong Kong Polytechnic University, Hung Hom
Gang Li: The Hong Kong Polytechnic University, Hung Hom
Chun Cheng: Southern University of Science and Technology

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Self-assembled monolayers (SAMs) have become pivotal in achieving high-performance perovskite solar cells (PSCs) and organic solar cells (OSCs) by significantly minimizing interfacial energy losses. In this study, we propose a co-adsorb (CA) strategy employing a novel small molecule, 2-chloro-5-(trifluoromethyl)isonicotinic acid (PyCA-3F), introducing at the buried interface between 2PACz and the perovskite/organic layers. This approach effectively diminishes 2PACz’s aggregation, enhancing surface smoothness and increasing work function for the modified SAM layer, thereby providing a flattened buried interface with a favorable heterointerface for perovskite. The resultant improvements in crystallinity, minimized trap states, and augmented hole extraction and transfer capabilities have propelled power conversion efficiencies (PCEs) beyond 25% in PSCs with a p-i-n structure (certified at 24.68%). OSCs employing the CA strategy achieve remarkable PCEs of 19.51% based on PM1:PTQ10:m-BTP-PhC6 photoactive system. Notably, universal improvements have also been achieved for the other two popular OSC systems. After a 1000-hour maximal power point tracking, the encapsulated PSCs and OSCs retain approximately 90% and 80% of their initial PCEs, respectively. This work introduces a facile, rational, and effective method to enhance the performance of SAMs, realizing efficiency breakthroughs in both PSCs and OSCs with a favorable p-i-n device structure, along with improved operational stability.

Date: 2024
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DOI: 10.1038/s41467-024-51760-5

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