Conjugated Polymer Electronics and Photovoltaic Applications

Conjugated polymers are macromolecules featuring alternating single and double bonds that enable delocalised π-electrons along their backbone, combining solution processability with tunable optoelectronic properties. In electronics, these materials serve as active layers in organic field-effect transistors (OFETs) and light-emitting devices, where backbone planarity, side-chain engineering and intermolecular packing govern charge mobility and device stability. In photovoltaics, donor–acceptor architectures and blend morphologies in bulk heterojunction solar cells determine light absorption, exciton dissociation and charge extraction, directly impacting power conversion efficiency. Advances in green polymerisation methods, conformational locking strategies and novel electron-deficient building blocks have led to enhanced ambient stability, extended near-infrared absorption and record ambipolar transport. The global significance of this research lies in the prospect of lightweight, flexible, low-cost electronics and solar modules, with scalable fabrication achieved via non-chlorinated solvents and additive-free processing.

Research from Nature Portfolio

Recent studies have demonstrated that rigidifying polymer backbones via non-metal catalysed condensation markedly reduces torsional disorder and enhances π-orbital delocalisation. A series of electron-affine polymers synthesised through aldol condensation exhibits strong near-infrared absorption, high electron mobility and air-stable transport in solution-processed thin films. By locking the conjugated backbone with unsaturated linkages, these materials eliminate rotational freedom, resulting in closer interchain electronic coupling and superior performance in organic thin-film transistors under ambient conditions.

Conjugated Polymer Electronics and Photovoltaic Applications publication trend

The graph below shows the total number of articles in conjugated polymer electronics and photovoltaic applications across all publications each year (not limited to Nature Index journals).

Technical terms

Conjugated polymer: A polymer with alternating single and double bonds allowing π-electron delocalisation.

Donor–acceptor architecture: A molecular motif combining electron-rich (donor) and electron-deficient (acceptor) units to tune electronic bandgaps.

Organic field-effect transistor (OFET): A transistor employing an organic semiconductor as the active channel for charge carrier transport.

Bulk heterojunction: A blend morphology in organic solar cells where donor and acceptor phases interpenetrate for efficient charge separation.

Power conversion efficiency (PCE): The ratio of electrical power output to incident light power in a photovoltaic device.

Conformational locking: A strategy to restrict rotational freedom in polymer backbones, improving planarity and electronic coupling.

References

1. The Influence of Interlocking Effects in Conjugated Polymers Synthesized by Aldol Polycondensation on Field-Effect Transistor Properties and Morphology. JACS Au (2025).
2. A Thieno[3,2‐b][1]benzothiophene Isoindigo Building Block for Additive‐ and Annealing‐Free High‐Performance Polymer Solar Cells. Advanced Materials (2015).
3. Design of donor-acceptor small molecules based on diazaisoindigo unit: Synthesis, theoretical calculations and photophysical studies. Dyes and Pigments (2023).
4. Investigating the Effect of Cross-Conjugation Patterns on the Optoelectronic Properties of 7,7′Isoindigo-Based Materials. Electronics (2023).
5. A nonchlorinated solvent-processed polymer semiconductor for high-performance ambipolar transistors. National Science Review (2021).