Electron-Accepting Pi-Conjugated Compound Containing Cyano-Substituted Naphthobisthiadiazole As Nonfullerene Acceptor In Organic Solar Cells

The incorporation of electron-accepting units into pi-conjugated systems can allow the modulation of the physical properties and frontier orbital energy levels of the molecules. An electron-accepting pi-conjugated compound (CNNTz-TR) containing cyano-substituted naphthobisthiadiazole (CNNTz) was synthesized via a nucleophilic substitution reaction as the key step. Owing to the presence of the cyano groups, CNNTz-TR affords a low-lying lowest unoccupied molecular orbital energy level. Organic solar cells based on the blend films of CNNTz-TR and a low-bandgap donor exhibited moderate power conversion efficiencies. The results showed that embedding the CNNTz unit into the pi-conjugated backbone is an effective approach for designing electron-accepting semiconducting materials.