Under the direction of Dr. Atindra Nath Pal and Biswajit Pabi, the S. N. Bose National Centre for Basic Sciences has produced a ground-breaking advancement in electronics. Their group has developed a novel kind of transistor that runs on single molecules as opposed to conventional electrical signals. This development, which uses mechanical forces for control, has the potential to have a big impact on areas like ultra-compact electronics, quantum information processing, and sophisticated sensing technologies.
To create this novel transistor, the researchers used a technique called mechanically controllable break junctions, or MCBJs. They carefully snapped a macroscopic metal wire using a piezoelectric stack, leaving a sub-nanometer gap big enough to fit one ferrocene molecule. When subjected to mechanical forces, ferrocene, which is composed of an iron atom sandwiched between two cyclopentadienyl (Cp) rings, displays a unique electrical behaviour. This method emphasises how mechanical gating can be used to control electron flow at the molecular level.
Together with their research team, Dr. Atindra Nath Pal and Biswajit Pabi found that the ferrocene molecules’ orientation between silver electrodes significantly impacts the transistor’s performance. The electrical conductivity through the junction can be increased or decreased depending on how these molecules are arranged. This discovery emphasises how crucial molecular geometry is to designing and enhancing transistor performance.
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