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Updated: Sep 8, 2025

Real-time Monitoring of Ligand-receptor Interactions with Fluorescence Resonance Energy Transfer
Published on: August 20, 2012
Revealing the Effect of the Side Chain on the Adsorption Configuration of the Asymmetric Interface Molecule (PFN-Br)
Gang Song1, Chuang Feng1, Guoqiang Liu1
1Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, P. R. China.
Abstract:
The side chains of the interface layer materials of organic solar cells play an essential role in promoting dissolution, self-assembly, and energy level regulation. Still, the formation mechanism of these theories needs to be further studied. Theoretical calculation methods can predict and analyze the self-assembly process. In this paper, the influence of side chains on the adsorption process of the poly[(9,9-bis(3'-(N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioct-ylfluorene)]dibromide (PFN-Br) molecule onto the active layer substrate was investigated using theoretical computational methods. The weak interaction between the substrate and the PFN-Br molecule makes it tend to form a more stable positive structure, forming a stronger interface dipole electric field and more effectively reducing the work function of the active layer, which is conducive to charge extraction and hindering hole transport. Subsequent experiments found that a soaking strategy enhances the formation of beneficial structures and improves charge extraction, paving the way for new molecular design and device optimization.
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