NDI-N (CAS number 3436-54-2), namely (N,N-dimethylamino)propyl naphthalene diimide is a cathode interlayer material with a naphthalene diimide (NDI) and two dimethylpropylamine side chains.

Naphthalene diimides, a class of excellent n‐type semiconductor materials with high electron affinities owing to their self‐organization manifested by the π–π stacking, are widely used as building blocks for n-type semiconducting polymers, i.e. PNDI(2OD)2T, (also known as N2200). NDI-based polymers exhibited an excellent thickness in sensitivity in organic solar cell devices (OSCs), and NDI-N was first of its kind developed for printable CIL for OSCs [2]. NDI-N can passivate defects or pinholes in the active layer, making large-area device with high efficiency possible.

Compared with perylene diimides (PDIs), NDI-based materials give higher optical transparency, making them ideal candidates in serving as charge-transport layer in organic solar cells.

NDI derivatives also show strong absorption in the UV region and a good UV resistance. For this reason, NDI-based cathode interlayer materials can effectively reduce the damage to the active layer materials caused by the UV irradiation while for the most of the time the solar panels works under direct sunlight.

Device structure: ITO/PEDOT:PSS/PBDB-T-2F (PM6):IT-4F/NDI-N (10 nm)/Al [2]

General Information

Chemical Structure