Modelling the temperature dependence of the threshold voltage of bis(1,4-dithiolbenzene) molecular assembly system

摘要

We present a new analytical model for the threshold voltage Vth of the molecular assembly system (MAS) made of bis(1,4-dithiolbenzene) in a parallel arrangement. The relationship between Vth and the temperature T associated with the intermolecular coupling effect is investigated under various geometrical MAS structures. The results show a linear relationship between Vth and T with an average slope of -0.0042 V/K and Y-intercept in the interval of 2.2584-3.4236 V described by polynomial regression of order 5. Vth decreases linearly by approximately 1.2 V when the temperature changes from 50 to 325 K. At constant temperature, when the intermolecular spacing d decreases from 6.9 to 3.3 angstrom, strengthening pi-orbital interactions further reduce the threshold voltage. This approach of modeling the temperature effects in a linear form significantly simplifies the model parameter extraction of MAS devices, which is an important and useful guideline for the design of future nanoscale devices. (C) 2015 The Japan Society of Applied Physics