| Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190 P. R. China University of Chinese Academy of Sciences, Beijing, 100049 P. R. China;2. Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190 P. R. China |
| Abstract: | Organic photovoltaic (OPV) cells have great potential in multi-scene applications because of their easily tunable optical absorption properties. However, the lagging development of the interlayer material limits the practicality of OPV cells. Herein, a naphthalene diimide-based polymer cathode interlayer named PNDI-Br is reported. The suitable energy level and improved light utilization enable the PNDI-Br-based cells to achieve a high power conversion efficiency of 18.7% under the illumination of AM 1.5G, representing the highest efficiency of inverted OPV cells. Under continuous illumination, PNDI-Br-based OPV cells can maintain an efficiency of over 80% after 1000 h, which reveals excellent stability of the cells. Furthermore, the decreased trap density and charge accumulation of PNDI-Br-based OPV cells results in limited charge recombination, which enables the cells to obtain a high fill factor and a low voltage loss in multi-lighting conditions. This work provides a stimulus for multi-scene applications of OPV cells. |
