Related Experiment Video
Updated: May 30, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
Exploring Single Atom Substitution In Phenanthro[9,10-d]Imidazole -Based D-π-A Architectures with Fluorene and its
Madanan Akshaya1, Ramesh Gayathri1, Predhanekar Mohamed Imran2
1Department of Chemistry, Central University of TamilNadu, Thiruvarur, 610 005, India.
Abstract:
A series of D-π-A compounds, with fluorene and its heteroanalogs (carbazole, dibenzofuran, dibenzothiophene) as the donor units and phenanthroimidazole as the acceptor, were designed and synthesized for non-volatile memory device applications. The effect of single-atom substitution on memory behavior was examined through optical, electrochemical, and computational studies. The photophysical studies confirm a significant intramolecular charge transfer from the donor to the acceptor unit, and the electrochemical analysis shows an irreversible anodic peak (0.99-1.21 V) with an optimal band gap ranging from 2.80 to 2.88 eV. All the compounds exhibited non-volatile binary WORM memory behaviour with an ON/OFF current ratio of 105 and 103. The devices also showed excellent stability over 100 cycles and maintained a retention time of 4000 s. Notably, the compound with carbazole substitution displayed a lower threshold voltage and a higher ON/OFF current ratio of 105. Density functional theory calculations confirmed that the combined effects of charge transfer and charge trapping mechanisms are crucial to the resistive switching mechanisms observed. This work highlights the potential of single atom substitution in D-π-A systems, providing valuable insights for designing high-performance data storage devices.
More Related Videos
08:07Assembly and Characterization of Biomolecular Memristors Consisting of Ion Channel-doped Lipid Membranes
Published on: March 9, 2019
11:33All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
Related Concept Videos
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
Diazonium Group Substitution: –OH and –H
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
Nucleophilic Aromatic Substitution: Elimination–Addition