Flexible Organic Solar Cell Technologies

Flexible organic solar cell technologies exploit carbon-based semiconducting materials to harvest solar energy in bendable, lightweight form factors. By replacing rigid substrates and brittle electrodes with plastic films, ultrathin metal layers and organic interlayers, these devices combine mechanical compliance with efficient light absorption. Advances in active-layer design, including donor–acceptor blends incorporating non-fullerene acceptors, have raised power conversion efficiencies above 15 % while maintaining mechanical resilience. Transparent conducting electrodes based on nanometal meshes, silver nanowires or conductive polymers deliver high optical transmittance and low sheet resistance, supporting photon capture and charge extraction under bending or stretching. Interface engineering through chelating agents, elastomeric binders or in situ grown interlayers has improved adhesion, waterproofness and cycling stability. Roll-to-roll and gravure printing techniques enable large-area fabrication at low cost, paving the way for conformable solar modules on textiles, wearable electronics and building facades. The global significance of flexible organic photovoltaics lies in their potential for decentralised, portable power and sustainable manufacturing of lightweight energy harvesters. Despite remaining challenges in long-term operational stability and environmental robustness, recent studies have made considerable strides towards practical deployment.

Research from Nature Portfolio

Recent studies have demonstrated interface strategies that unify high efficiency and mechanical integrity in ultraflexible devices. One report introduced a metal-ion chelated polymer interlayer that doubled bending strain tolerance compared with conventional metal oxides. On submicrometre plastic substrates, non-fullerene organic cells achieved power conversion efficiencies exceeding 15 % and retained performance after repeated compression and release cycles, illustrating both chemical compatibility and mechanical durability. More recently, ultraflexible photovoltaics with an in situ grown hole-transporting layer have combined waterproofing and conformability without sacrificing flexibility. By thermally annealing silver directly on the active film, interlayer adhesion was enhanced, yielding devices just three micrometres thick that sustained immersion in water and hundreds of stretching cycles with minimal efficiency loss. These developments underscore the importance of adhesive interlayers and encapsulation strategies for real-world wearable applications.

Flexible Organic Solar Cell Technologies publication trend

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

Technical terms

Organic photovoltaic (OPV): A solar cell that uses carbon-based semiconducting materials to convert light into electricity.

Power conversion efficiency (PCE): The percentage of solar energy converted into electrical energy by a photovoltaic device.

Non-fullerene acceptor (NFA): A small molecule or polymer that accepts electrons in the active layer, offering improved absorption and morphological stability over fullerene derivatives.

Transparent conducting electrode (TCE): A thin, conductive and transparent film that allows light transmission while collecting charge carriers.

Roll-to-roll printing: A continuous manufacturing process for depositing functional layers on flexible substrates at large scale.

References

1. Robust metal ion-chelated polymer interfacial layer for ultraflexible non-fullerene organic solar cells. Nature Communications (2020).
2. Ultra-flexible semitransparent organic photovoltaics. npj Flexible Electronics (2023).
3. Stretchable transparent electrodes for conformable wearable organic photovoltaic devices. npj Flexible Electronics (2021).
4. Thermoplastic elastomer enhanced interface adhesion and bending durability for flexible organic solar cells. npj Flexible Electronics (2022).
5. Waterproof and ultraflexible organic photovoltaics with improved interface adhesion. Nature Communications (2024).
6. Manipulating the Macroscopic and Microscopic Morphology of Large‐Area Gravure‐Printed ZnO Films for High‐Performance Flexible Organic Solar Cells. Energy & Environmental Materials (2023).