Conjugated Polymer Materials for Photovoltaic Applications
Summary
Conjugated polymers harness extended π-electron delocalisation along their backbone to absorb sunlight and transport charge, offering a versatile platform for lightweight, flexible solar cells. The interplay of donor–acceptor segments within a polymer chain permits fine tuning of optical band gaps and energy levels, thereby optimising light harvesting across the solar spectrum. Bulk heterojunction architectures, in which interpenetrating networks of conjugated polymers and electron acceptors form nanoscale phase domains, facilitate efficient exciton dissociation and charge transport. Material design emphasises complementary absorption profiles, high carrier mobility and morphological stability under operational conditions. Recent advances have focused on ladder-type backbones and novel heteroatomic units to suppress energetic disorder and enhance film crystallinity. Improved synthetic routes and post-processing techniques have elevated power conversion efficiencies while maintaining the intrinsic advantages of solution processability, mechanical flexibility and low environmental impact. The global drive towards sustainable energy has accelerated efforts to integrate conjugated polymer photovoltaics into building-integrated and portable power applications, underscoring their strategic importance for decarbonisation and off-grid electrification.
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Conjugated Polymer Materials for Photovoltaic Applications publication trend
The graph below shows the total number of articles in conjugated polymer materials for photovoltaic applications across all publications each year (not limited to Nature Index journals).
Technical terms
Conjugated polymer: A macromolecule with alternating single and double bonds that enables delocalisation of π‐electrons along its backbone, facilitating light absorption and charge transport.
Bulk heterojunction: A blend morphology in which interpenetrating networks of donor and acceptor materials create extensive interfaces for exciton dissociation in organic solar cells.
Donor–acceptor polymer: A conjugated system incorporating electron‐rich (donor) and electron‐poor (acceptor) units to control optical band gap and frontier orbital energies.
Power conversion efficiency (PCE): The ratio of electrical power output from a photovoltaic device to the incident solar power, expressed as a percentage.
Non-fullerene acceptor: A small‐molecule or polymeric electron acceptor alternative to fullerenes, offering tunable energy levels and absorption properties for organic photovoltaics.
References
- The Preparation of Dithieno[3,2-b:4,5-c’]germole, and Its Application as a Donor Unit in Conjugated D–A Compounds. Molecules (2024).
- Influence of the Electron Deficient Co‐Monomer on the Optoelectronic Properties and Photovoltaic Performance of Dithienogermole‐based Co‐Polymers. Advanced Functional Materials (2013).
- High performance conjugated terpolymers as electron donors in nonfullerene organic solar cells. Journal of Materials Chemistry C (2020).
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