Robust and hydrophobic interlayer material for efficient and highly stable organic solar cells
Yi Yang, Jingwen Wang, Yunfei Zu, Qing Liao, Shaoqing Zhang, Zhong Zheng, Bowei Xu, Jianhui Hou,
Robust and hydrophobic interlayer material for efficient and highly stable organic solar cells,
Joule, Volume 7, Issue 3, 2023, Pages 545-557, ISSN 2542-4351,
https://doi.org/10.1016/j.joule.2023.02.013
A robust, hydrophobic electron transporting interlayer for organic solar cells (OSCs) is designed using a cross-linkable naphthalene diimide (NDI) derivative. The non-polar electron donor PCy2 is used to n-dope the crosslinked c-NDI:PCy2 film, increasing its doping density and conductivity.
This hydrophobic interlayer protects the device against water, resulting in excellent water resistance. With the c-NDI:PCy2 interlayer, a power conversion efficiency of 17.7% is achieved, which is the highest for OSCs with an inverted device architecture. Notably, this OSC can be used underwater, maintaining 70% of its initial efficiency after 1,000 hours in the dark or 4 hours under continuous illumination.