2026-06-30 リンショーピング大学
The findings in the study can take efficiency of organic solar cells to the next level, according to the researchers.
＜関連情報＞
- https://liu.se/en/news-item/liu-researchers-push-the-boundaries-of-organic-solar-cells
- https://www.nature.com/articles/s41566-026-01946-8
有機太陽電池のフィルファクター限界を克服する Overcoming the fill-factor limit of organic solar cells
Huotian Zhang,Jun Yuan,Tong Wang,Yijie Nai,Nurlan Tokmoldin,Wei Liu,Shanchao Ouyang,Rokas Jasiūnas,Yiting Liu,Yuxuan Li,Mohammad Saeed Shadabroo,Manasi Pranav,Nakul Jain,Xiaolei Zhang,Veaceslav Coropceanu,Artem A. Bakulin,Sai-Wing Tsang,Vidmantas Gulbinas,Safa Shoaee,Yingping Zou,Dieter Neher,Thomas Kirchartz & Feng Gao
Nature Photonics Published:19 June 2026
DOI:https://doi.org/10.1038/s41566-026-01946-8
Abstract
Although organic solar cells have surpassed 20% power conversion efficiency, a persistent trade-off between open-circuit voltage and fill factor (FF) prevents them from closing the gap with inorganic technologies. Here we investigate this trade-off across a wide range of devices and identify an FF limit arising from field-dependent free-charge generation. This limit becomes more severe as voltage losses are minimized, thereby imposing an open-circuit voltage–FF trade-off. To quantitatively describe this limit, we develop an analytical model for field-dependent charge generation, revealing that the underlying cause is the field-sensitive charge-transfer process between excitons and charge-transfer states. This sensitivity originates from the field-induced charge-transfer state energy variations, mainly caused by the Stark effect. Guided by this physics-based model, we highlight that a long exciton lifetime is one of the practical and effective methods to overcome the FF limit.
