1. Importance of Electric-Field-Independent Mobilities in Thick-Film Organic Solar Cells
- Author
-
Carr Hoi Yi Ho, Yusen Pei, Yunpeng Qin, Chujun Zhang, Zhengxing Peng, Indunil Angunawela, Austin L. Jones, Hang Yin, Hamna F. Iqbal, John R. Reynolds, Kenan Gundogdu, Harald Ade, Shu Kong So, and Franky So
- Subjects
General Materials Science - Abstract
In organic solar cells (OSCs), a thick active layer usually yields a higher photocurrent with broader optical absorption than a thin active layer. In fact, a ∼300 nm thick active layer is more compatible with large-area processing methods and theoretically should be a better spot for efficiency optimization. However, the bottleneck of developing high-efficiency thick-film OSCs is the loss in fill factor (FF). The origin of the FF loss is not clearly understood, and there a direct method to identify photoactive materials for high-efficiency thick-film OSCs is lacking. Here, we demonstrate that the mobility field-dependent coefficient is an important parameter directly determining the FF loss in thick-film OSCs. Simulation results based on the drift-diffusion model reveal that a mobility field-dependent coefficient smaller than 10
- Published
- 2022