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High Resolution Image Download MS PowerPoint Slide Over the past few years, organic small molecules (OSM) having a π-conjugated heteroatomic aromatic backbone along with terminal donor–acceptor (D-A) groups have emerged as one of the most promising materials for organic resistive switching (ORS) devices. In this research, the resistive switching (RS) properties of two rationally synthesized coumarin derivatives, 7-(2-(benzylamino)ethoxy)-4-methyl-2H-chromen-2-one (CAMN1) and 7-(2-(4-methoxyphenylamino)ethoxy)-4-methyl-2H-chromen-2-one (CAMN2), have been exhaustively studied. The CAMN1-based ORS device exhibited WORM RS behavior with an excellent device yield of 97.22%, while the CAMN2-based device showed both WORM as well as RRAM RS behavior depending on the compliance current (CC) with a perfect device yield of 100%. Both devices exhibited superior read endurance on the order of 10 4 as well as a retention time of at least 3 × 10 4 s with a very good memory window of the order of 10 4 or more. Moreover, both devices exhibited superior long-term physical and thermal stability. The cyclability of the CAMN2-based device in the RRAM mode of operation was found to be 116 cycles. DFT-based calculations as well as absorption spectroscopic studies reveal the role of the intra/intermolecular charge transfer (CT) in the RS behavior of both the devices. Moreover, the presence of the methoxy (−OCH 3 ) group in the CAMN2 molecule has been identified as the key reason behind the observed difference in the RS behaviors of the two molecules.
Deb et al. (Thu,) studied this question.