Organic Photovoltaics Development and Performance Optimization

Organic photovoltaics (OPVs) have evolved from early donor–acceptor blends to sophisticated architectures that combine multiple photoactive components or integrate donor and acceptor units within single materials. The bulk heterojunction concept, in which interpenetrating nanoscale networks of electron‐donor and electron‐acceptor domains facilitate exciton dissociation and charge transport, has underpinned most advances in power conversion efficiency (PCE). More recently, the field has pursued two parallel strategies: multicomponent systems engineered for stability and cost‐effectiveness, and single‐component architectures designed to simplify fabrication and enhance morphological robustness. Progress in non‐fullerene acceptors, block copolymer design and molecular dyads has enabled fine control of phase morphology, energy levels and interfacial configuration, yielding devices with PCEs exceeding 12% in laboratory settings and operational lifetimes beyond 1,000 h. Optimisation of film formation, crystallinity, vertical charge mobility and interface energetics has driven both incremental and step‐change improvements in performance, pointing towards scalable, high‐throughput manufacturing of flexible, lightweight solar modules with global significance for sustainable energy deployment.

Research from Nature Portfolio

Recent studies have demonstrated that one‐pot synthesis of multicomponent polymeric photoactive layers can yield devices with a PCE of around 12% and over 80% retention of initial performance after 1,000 h of thermal ageing. By tuning the relative proportions of block polymers and small‐molecule fractions, researchers achieved frozen, finely interdigitated morphologies that balance efficient charge transport and long‐term film stability under continuous operation. Another line of work has introduced model heterojunction interfaces in which a non‐fullerene acceptor moiety is covalently linked to a donor polymer backbone. By constraining the acceptor in a co‐facial geometry, these synthetic interfaces allow systematic adjustment of charge‐separation kinetics and the energy of the resulting charge‐transfer state, offering direct insight into the molecular factors that govern photogeneration at buried interfaces.

Organic Photovoltaics Development and Performance Optimization publication trend

The graph below shows the total number of articles in organic photovoltaics development and performance optimization across all publications each year (not limited to Nature Index journals).

Technical terms

Bulk heterojunction: A nanoscale interpenetrating network of donor and acceptor materials that facilitates exciton dissociation and charge transport in organic solar cells.

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

Exciton: A bound electron–hole pair generated by photon absorption in an organic semiconductor, which must dissociate at a donor–acceptor interface to generate free charges.

Donor–acceptor dyad: A molecular architecture in which electron‐donor and electron‐acceptor units are covalently linked to enable intramolecular charge generation and transport.

Charge‐transfer state: An intermediate electronic state in which an electron resides on the acceptor and a hole on the donor before full separation into free charge carriers.

References

1. Efficient and stable organic solar cells enabled by multicomponent photoactive layer based on one-pot polymerization. Nature Communications (2023).
2. Synthesis of model heterojunction interfaces reveals molecular-configuration-dependent photoinduced charge transfer. Nature Chemistry (2024).
3. Desirable Uniformity and Reproducibility of Electron Transport in Single‐Component Organic Solar Cells. Advanced Science (2023).
4. Fused‐ring induced end‐on orientation in conjugated molecular dyads toward efficient single‐component organic solar cells. Aggregate (2022).