Organic Solar Cell Performance Optimization Techniques

Organic solar cells harness the tunability of conjugated polymers and small molecules to convert sunlight into electricity through a bulk heterojunction architecture. Performance optimisation revolves around maximising light absorption, charge generation, transport and extraction while minimising energy losses. Key strategies include molecular design of donors and acceptors to enhance absorption spectra and electronic coupling, control of nanoscale morphology to balance phase separation and percolation pathways, and interfacial engineering to align energy levels and suppress recombination. Processing advances—such as solvent selection, sequential deposition and scalable coating techniques—combine with device architectural innovations, including tandem structures and novel series‐connection layouts, to push power conversion efficiencies beyond 19 % in the laboratory and improve stability under operation. Environmental considerations, notably the shift to non‐halogenated or biorenewable solvents, are increasingly central to establishing viable manufacturing routes for commercial deployment.

Research from Nature Portfolio

Innovative layer‐by‐layer processing has enabled record performance in green‐solvent device fabrication. An auxiliary sequential deposition method introduces an additional interlayer between donor and acceptor films, promoting favourable molecular packing and reducing charge recombination; this approach yields organic solar cells exceeding 19 % efficiency when processed from halogen‐free media. In module engineering, a series‐connection architecture exploits charge recombination at interlayer contacts to eliminate complex patterning steps. By combining doctor-blade and slot-die printing of electron- and hole-transport layers, modules reaching 7.5 % efficiency over several square centimetres have been produced without aperture loss or added process complexity, illustrating a pathway to scalable manufacturing.

Organic Solar Cell Performance Optimization Techniques publication trend

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

Technical terms

Bulk heterojunction: A nanoscale blend of donor and acceptor materials forming interpenetrating networks for efficient exciton dissociation and charge transport.

Power conversion efficiency (PCE): The percentage ratio of electrical power output from an organic solar cell to the incident solar power input.

Non-fullerene acceptor (NFA): An electron-accepting molecule alternative to fullerene derivatives, designed for broader absorption and tunable energy levels.

Interfacial engineering: The modification of anode or cathode buffer layers to optimise energy‐level alignment and reduce interfacial recombination losses.

Sequential deposition: A fabrication method in which donor and acceptor layers are cast in separate steps, often with an auxiliary layer to control morphology.

Blade coating: A scalable film‐deposition technique in which a solution is spread by a blade across a substrate to form uniform active layers suitable for large-area devices.

References

1. Green-Solvent Processed Blade-Coating Organic Solar Cells with an Efficiency Approaching 19% Enabled by Alkyl-Tailored Acceptors. Nano-Micro Letters (2023).
2. Large-area organic photovoltaic modules with 14.5% certified world record efficiency. Joule (2024).
3. Biorenewable Solvents for High-Performance Organic Solar Cells. ACS Energy Letters (2023).
4. A series connection architecture for large-area organic photovoltaic modules with a 7.5% module efficiency. Nature Communications (2016).
5. Auxiliary sequential deposition enables 19%-efficiency organic solar cells processed from halogen-free solvents. Nature Communications (2023).