Samsung Advanced Institute of Technology

A true green absorbing organic material with dual intramolecular chalcogen bonds (ChaBs) is designed, synthesized, and characterized. In the novel organic material, a chalcogen tellurium (Te) atom and a surrounding oxygen atom of a carbonyl moiety form one ChaB, and the Te atom and an adjacent nitrogen atom of a pyridine moiety form another. The novel ChaB material with two intramolecular ChaBs has a surprisingly narrow absorption spectrum width and high absorption coefficients close to the c² resonance parameter of ~0.5 due to its cyanine-like property, and the material also has good electrical properties due to a rigid and planar molecular structure. Based on the good optical and electrical properties, the ChaB material is successfully used in high performance organic photon-to-current conversion optoelectronic devices with true green color selective absorption. According to this work, the addition of intramolecular ChaB improves the optical and optoelectronic properties of highly efficient and highly color selective organic photodiodes for the replacement of Si-based complementary metal-oxide-semiconductor (CMOS) image sensors.