High-efficiency cathode interface materials (CIM) are an important component to effectively improve the performance of organic solar cells (OSCs). Although high-performance CIMs are needed to meet various OSC requirements, there are few potential CIM candidates.
Gao Ke and others from Shandong University developed an amino-functional graphodiyne derivative (GDY-N), which represents the first example of GDY showing good solubility in alcohol. Using GDY-N as the CIM, the D18-Cl:L8-BO-based device achieved an outstanding champion PCE of 19.30% (certification result: 19.05%), which is one of the highest efficiencies reported in OSC to date.
It is worth noting that the GDY-N-based device exhibits thickness-insensitive characteristics and can still maintain an initial efficiency of 95% even with a film thickness of 25 nm. Furthermore, GDY-N shows broad versatility and contributes to the excellent stability of OSCs. This work not only enriches the diversity of GDY derivatives but also demonstrates the feasibility of GDY derivatives as CIM with high thickness tolerance in OSCs.
Y. Kan, Y. Sun, Y. Ren, Y. Xu, X. Jiang, H. Shen, L. Geng, J. Li, P. Cai, H. Xu, K. Gao, Y. Li, Amino-Functionalized Graphdiyne Derivative as a Cathode Interface Layer with High Thickness Tolerance for Highly Efficient Organic Solar Cells. Adv. Mater. 2024, 2312635.
https://doi.org/10.1002/adma.202312635
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202312635