Molecular electronics seeks to decrease the cost, power consumption and size of devices, using a variety of approaches. However, few attempts have been made to address circuit simulation. The availability of common semiconductor components means they can be used for modeling and simulating molecular circuits to speed progress in molecular electronics. The present study examines the switching of a gated oligo-phenylenevinylene (OPV) molecule as a NMOS molecular transistor, resistance as an indicator of methyl molecules, and the linking of these abilities using LTspice simulation software. The circuit simulation of molecules of basic logic gates, half-adder, full-adder, and multiplier logic circuits are carried out. The numerical results may shed light on the next applications of molecular systems and make them a good, promising candidate for field-effect transistors.

No abstract

The field of molecular electronics is a branch of science, which can have a variety of semiconductor technologies that extend beyond the silicon-based technology for the future. This branch of science may solve the limitations on size, high power usage and low speed in semiconductor technology. Rapid improvements in molecular electronics require modeling in the design of molecular devices. In this regard, we examine a three-leg molecule as a molecular transistor model and an indicator of methyl molecule as a resistance, in which the linkage of these abilities is carried out using LTspice simulation software. In order to investigate the effect of gated molecular on transport properties of the device, we design the half-adder molecular circuit and full-adder molecular circuit with them. The feasibility of building a prototype molecular transistor is illustrated using three-leg molecules directly contacted to gold electrodes, which the transmitted current from the structure is calculated using the Landauer formula. The application of the predicted results can be a base for designing moletronics devices.

No abstract

Conventional semiconductor components can be used for modeling and simulating molecular structures, so the progress in molecular electronics can be accelerated by creating a link between molecular electronics and semiconductor technology. Little work has been done so far on molecular electronic modeling. The present work attempts to focus on molecular electronic modeling by proposing a typical model and discussing its theory. Moreover, the circuit components used for modeling the molecules are introduced. An asymmetric oligo phenylene ethynylene (OPE) molecular diode and a four-benzene molecular diode are designed using the presented typical model. Furthermore, using LTspice software, the currents are obtained from the model and molecules for both OPE molecular diode and four-benzene molecular diode to confirm their appropriate performance. Then transmission spectrum, potential drop profile, and rectification ratio are obtained and analyzed for the four-benzene molecular diode using Atomistix ToolKit (ATK) software. Finally, various molecular gates and molecular memory logic circuits including NOT, NAND, NOR, SR Flip Flop, and D flip-flop are designed using the four-benzene molecular diode model.