How Does the Symmetry of S1 Influence Exciton Transport in Conjugated Polymers?

TL;DR

This study investigates how the symmetry of the S1 electronic state affects exciton transport in conjugated polymers, using advanced spectroscopy to reveal fundamental relationships crucial for optoelectronic device performance.

Contribution

It is the first to explore the influence of S1 symmetry on exciton transport in highly aligned conjugated polymers.

Findings

S1 symmetry significantly impacts exciton mobility.

Aligned polymers exhibit enhanced exciton transport.

Spectroscopy reveals symmetry-dependent exciton dynamics.

Abstract

Many optoelectronic devices based on organic materials require rapid and long-range singlet exciton transport. Key factors that control the transport of singlet excitons includes the electronic structure of the material, disorder and exciton-phonon coupling. An important parameter whose influence on exciton transport has not been explored is the symmetry of the singlet electronic state (S1). Here, we employ femtosecond transient absorption spectroscopy and microscopy to reveal the relationship between the symmetry of S1 and exciton transport in highly aligned, near-disorder free, one-dimensional conjugated polymers based on polydiacetylene.