Conformation Control of Conjugated Polymers

Abstract

In the past few decades, conjugated polymers have arousedextensive interest in organic electronic applications. The electrical performance of conjugated polymers has ac loser elationship with their backbonec onformation. The conformation of the polymer backbones trongly affects the pelectron delocalization along polymer chains, the energy band gap, interchain interactions, and further affects charge transport properties. To realize ar igid coplanar backbone that usually possesses efficient intrachain charget ransport properties and enhanced p-p stackings, such conformation control becomes au seful strategy to achieve high-performance (semi)conducting polymers. This minireview summarizes the most important polymer structures through conformation control at the molecular level, and then divides these rigid coplanar conjugated polymers into three categories:1)noncovalent interactions locked conjugated polymers;2)double-bondl inked conjugated polymers; 3) ladder conjugated polymers. The effect of the conformation controlo np hysical nature, optoelectronic properties, and their devicep erformance is also discussed, as well as the challenges of chemical synthesis and structuralc haracterization.

Unraveling the Molar Mass Dependence of Shearing‐Induced Aggregation Structure of a High‐Mobility Polymer Semiconductor

“…From the viewpoint of polymer physics, the conformational complexity associated with the long polymer chains, as well as the interchain and intrachain interactions are strongly affected by the molecular structure of CPs. [33][34][35][36] How to precisely control the aligned structure and unravel its dependence on structural factors is urgently needed to further enhance the charge-transport properties of CPs.…”

High-performance polymer field-effect transistors: from the perspective of multi-level microstructures

“…Besides, the lone pair electrons of the heteroatoms can further form the weak molecular interactions, locking the backbone conformation. 20 For instance, the fluorine and nitrogen atoms can form weak intramolecular F…H or N…H hydrogen bonds. 55 Several other types of interactions, including F…S, S…N, and S…O, also contribute to the polymer backbone conformations.…”

“…First, we summarize the ingenious molecular design strategies to develop high-performance conjugated polymers. Molecular-scale properties, such as oxidation/reduction potentials, 16–19 conformational locking, 20,21 etc. , can be finely controlled through these strategies.…”

“…First, we summarize the ingenious molecular design strategies to develop highperformance conjugated polymers. Molecular-scale properties, such as oxidation/reduction potentials, [16][17][18][19] conformational locking, 20,21 etc., can be nely controlled through these strategies. Although a discrete molecule's properties can be assumed or even predicted by molecular design and theoretical simulations, the situations for molecular assemblies and multi-level Ze- Fan microstructures are much complicated.…”

A Short Review on Surface‐Confined Monolayers of π‐Conjugated Polymers for Photovoltaics

“…[ 41 ] As a result, great efforts have been devoted to investigate the controlled formation of the desired micro‐/nanostructure of CPs for PV applications. [ 36,42–45 ]…”