Organic Photovoltaic Technology and Performance

Organic photovoltaics (OPVs) employ conjugated polymers or small-molecule semiconductors to convert sunlight into electricity via a bulk heterojunction architecture. Recent material advances have driven power conversion efficiencies beyond 18 %, approaching those of established thin-film technologies. The inherent mechanical flexibility, low-temperature solution processing and tunable optical properties of OPVs enable lightweight, semi-transparent modules suited to building-integrated or agrivoltaic applications. However, commercialisation remains challenged by operational stability under thermal, photochemical and moisture stresses. Device lifetime studies under indoor and outdoor conditions reveal burn-in phenomena, morphological evolution and interfacial degradation that limit long-term performance. Continuous roll-to-roll fabrication methods have improved throughput and scalability, while novel interlayers and encapsulation strategies are enhancing thermal and environmental resilience. Lifecycle assessments indicate that OPVs offer favourable energy payback times and environmental impact compared to silicon-based photovoltaics. Interdisciplinary research now focuses on optimising donor–acceptor blends, charge transport layers and module architectures to reconcile high efficiency, durability and sustainable production.

Research from Nature Portfolio

Recent studies have examined the outdoor stability of bulk heterojunction devices over extended periods. In one report, devices based on a PCDTBT:PC71BM blend underwent an initial burn-in phase of approximately 450 hours followed by a TS80 lifetime exceeding 6200 hours. Thermal mismatch between layers and lateral moisture ingress were identified as primary degradation drivers. A complementary investigation of a polyfluorene–fullerene blend under continuous outdoor exposure for over 12 000 hours demonstrated that degradation correlates closely with the accumulated optical energy dose, and that indoor lifetime tests under simulated sunlight mirror outdoor trends when dose dependency is accounted for. Together, these findings elucidate the roles of interfacial stress and light-induced morphological changes in dictating operational lifetime.

Organic Photovoltaic Technology and Performance publication trend

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

Technical terms

Bulk heterojunction: An interpenetrating network of electron donor and acceptor materials in the active layer that facilitates charge separation and transport.

Power conversion efficiency (PCE): The ratio of electrical power output to incident solar power under standard test conditions, expressed as a percentage.

Roll-to-roll processing: A continuous manufacturing technique in which flexible substrates are unwound from a roll, coated or printed with functional layers, and rewound for high-throughput device fabrication.

TS80 lifetime: The operational time required for a device’s power conversion efficiency to decline to 80 % of its initial value under defined environmental or accelerated ageing conditions.

References

1. Long term outdoor performance evaluation of printed semitransparent organic photovoltaic modules for BIPV/BAPV applications. Energy & Environmental Science (2025).
2. Current Status of Outdoor Lifetime Testing of Organic Photovoltaics. Advanced Science (2018).
3. Life cycle analyses of organic photovoltaics: a review. Energy & Environmental Science (2013).
4. High‐Volume Processed, ITO‐Free Superstrates and Substrates for Roll‐to‐Roll Development of Organic Electronics. Advanced Science (2014).
5. PCDTBT based solar cells: one year of operation under real-world conditions. Scientific Reports (2016).
6. Comparative indoor and outdoor stability measurements of polymer based solar cells. Scientific Reports (2017).
7. Down‐conversion materials for organic solar cells: Progress, challenges, and perspectives. Aggregate (2022).
8. Power performance and thermal operation of organic photovoltaic modules in real operating conditions. Progress in Photovoltaics Research and Applications (2020).
9. Evaluating the Performance of Flexible, Semi-Transparent Large-Area Organic Photovoltaic Arrays Deployed on a Greenhouse. AgriEngineering (2022).
10. Effect of the Electron Transport Layer on the Interfacial Energy Barriers and Lifetime of R2R Printed Organic Solar Cell Modules. ACS Applied Energy Materials (2018).