Long-Lived Charge Carrier Photogeneration in a Cooperative Supramolecular Double-Cable Polymer

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2024 Oct 22

PMID 39437433

Authors

Jan Joseph

Jose Augusto Berrocal

Nicolas M Casellas

Dirk M Guldi

Tomas Torres

Miguel Garcia-Iglesias

Affiliations

Soon will be listed here.

Abstract

A newly designed C-symmetric disc-shaped chromophore, , features electron accepting naphthalene diimides linked to an electron donor BTT core. self-assembles in apolar solvents into highly ordered, chiral supramolecular fibers through π-π and 3-fold hydrogen-bonding interactions. This leads to a cooperative formation of plane-to-plane stacking of BTTs and J-aggregation of the outer NDIs. Such a structure ensures high charge mobility. Only photoexcitation of BTT in the polymers triggers a unidirectional electron transfer from BTT to NDI and results in (BTT-NDI) lifetimes that are by up to 3 orders of magnitude longer compared to (NDI-NDI) that is formed upon NDI photoexcitation. A multiphasic decay implies ambipolar pathways for charge carriers, that is, electron and hole delocalization along the respective BTT and NDI stacks. Our supramolecular approach offers potential for developing functional supramolecular polymers with continuous pathways for electrons and holes and, in turn, minimizing charge recombination losses in organic photovoltaic devices.

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