Real-time monitoring polymerization degree of organic photovoltaic materials toward no batch-to-batch variations in device performance

Lin-Yong Xu, Wei Wang, Xinrong Yang, Shanshan Wang, Yiming Shao, Mingxia Chen, Rui Sun () and Jie Min ()
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Lin-Yong Xu: Wuhan University
Wei Wang: Wuhan University
Xinrong Yang: Wuhan University
Shanshan Wang: Wuhan University
Yiming Shao: Wuhan University
Mingxia Chen: Wuhan University
Rui Sun: Wuhan University
Jie Min: Wuhan University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Polymerization degree plays a vital role in material properties. Previous methodologies of molecular weight control generally cannot suppress or alleviate batch-to-batch variations in device performance, especially in polymer solar cells. Herein, we develop an in-situ photoluminescence system in tandem with a set of analysis and processing procedures to track and estimate the polymerization degree of organic photovoltaic materials. To support the development of this protocol, we introduce polymer acceptor PYT constructed by near-infrared Y-series small molecule acceptors via Stille polymerization, and shed light on the correlations between molecular weight, spectral parameters, and device efficiencies that enable the design of the optical setup and confirm its feasibility. The universality is verified in PYT derivatives with stereoregularity and fluoro-substitution as well as benzo[1,2-b:4,5-b’]dithiophene-based polymers. Overall, our result provides a tool to tailor suitable conjugated oligomers applied to polymer solar cells and other organic electronics for industrial scalability and desired cost reduction.

Date: 2024
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DOI: 10.1038/s41467-024-45510-w

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