Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.210
Publication date: 11th July 2022
The exact molecular interactions at the interface of an organic heterojunction are key to the development of efficient optoelectronic devices. Due to the difficulty in characterizing these buried and (likely) disordered heterointerfaces the exact interfacial structure in most systems remains a mystery. Here, we demonstrate a novel synthetic strategy to design and control model interfaces, allowing for their detailed study in isolation from the bulk material. This is achieved and highlighted through the synthesis of a donor polymer – non-fullerene acceptor through-space linked system, where the exact position and orientation of the components is completely controlled. By placing the acceptor above different portions of the conjugated polymer, drastic effects on the CT state properties are observed. We observe that through synthetic control the oscillator strength of the CT state and the rate of its formation can be controlled by several orders of magnitude. These results have signficant implications for the design and operation of OPV devices
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