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Exciton diffusion; encapsulated polymer nanoparticles; electron and hole acceptor.

Exciton generation, migration and dissociation are key fundamental processes that dictate the efficiency of optoelectronic devices. Here, we investigate exciton diffusion process of conjugated polymer nanoparticles (PNPs) in the presence of electron and hole scavenger molecules using time-resolved spectroscopy. We found that the exciton diffusion length of hole transporting PNPs, decreases in the presence of hole scavenger molecule and it increases in the presence of electron scavenger molecule. Analysis reveals that the diffusivity of excitons can be controlled by changing the nature of scavenger molecules. Such fundamental study is important for developing devices where lower and higher exciton diffusivities are required depending on the requirement of application mode.

ARNAB GHOSH¹ BIKASH JANA¹ AJEET KUMAR² SRIJON GHOSH¹ AMITAVA PATRA¹

1. School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
2. Indian Institute of Science Education and Research, Mohali 140306, India

Published

29 July 2020

Manuscript received

14 August 2019

Accepted

1 January 2019

Final version published online

29 July 2020

• 0174suppl.docx