Auxiliary sequential deposition enables 19%-efficiency organic solar cells processed from halogen-free solvents

Siwei Luo, Chao Li, Jianquan Zhang, Xinhui Zou, Heng Zhao, Kan Ding, Hui Huang, Jiali Song, Jicheng Yi, Han Yu, Kam Sing Wong, Guangye Zhang, Harald Ade, Wei Ma, Huawei Hu, Yanming Sun () and He Yan ()
Additional contact information
Siwei Luo: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay
Chao Li: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay
Jianquan Zhang: The Chinese University of Hong Kong
Xinhui Zou: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay
Heng Zhao: Xi’an Jiaotong University
Kan Ding: North Carolina State University
Hui Huang: Shenzhen Technology University
Jiali Song: Beihang University
Jicheng Yi: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay
Han Yu: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay
Kam Sing Wong: Hong Kong University of Science and Technology, Clear Water Bay
Guangye Zhang: Shenzhen Technology University
Harald Ade: North Carolina State University
Wei Ma: Xi’an Jiaotong University
Huawei Hu: Donghua University
Yanming Sun: Beihang University
He Yan: Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract High-efficiency organic solar cells are often achieved using toxic halogenated solvents and additives that are constrained in organic solar cells industry. Therefore, it is important to develop materials or processing methods that enabled highly efficient organic solar cells processed by halogen free solvents. In this paper, we report an innovative processing method named auxiliary sequential deposition that enables 19%-efficiency organic solar cells processed by halogen free solvents. Our auxiliary sequential deposition method is different from the conventional blend casting or sequential deposition methods in that it involves an additional casting of dithieno[3,2-b:2’,3’-d]thiophene between the sequential depositions of the donor (D18-Cl) and acceptor (L8-BO) layers. The auxiliary sequential deposition method enables dramatic performance enhancement from 15% to over 18% compared to the blend casting and sequential deposition methods. Furthermore, by incorporating a branched-chain-engineered acceptor called L8-BO-X, device performance can be boosted to over 19% due to increased intermolecular packing, representing top-tier values for green-solvent processed organic solar cells. Comprehensive morphological and time-resolved characterizations reveal that the superior blend morphology achieved through the auxiliary sequential deposition method promotes charge generation while simultaneously suppressing charge recombination. This research underscores the potential of the auxiliary sequential deposition method for fabricating highly efficient organic solar cells using environmentally friendly solvents.

Date: 2023
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DOI: 10.1038/s41467-023-41978-0

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