Effect of interfacial coupling on rectification in organic spin rectifiers

Abstract

The effect of interfacial coupling on rectification in an organic co-oligomer spin diode is investigated theoretically by considering spin-independent and spin-resolved couplings respectively. In the case of spin-independent coupling, an optimal interfacial coupling strength with a significant enhanced rectification ratio is found, whose value depends on the structural asymmetry of the molecule. In the case of spin-resolved coupling, we found that only the variation of the interfacial coupling with specific spin is effective to modulate the rectification, which is due to the spin-filtering property of the central asymmetric magnetic molecule. A transition of the spin-current rectification between parallel spin-current rectification and antiparallel spin-current rectification may be observed with the variation of the spin-resolved interfacial coupling. The interfacial effect on rectification is further analyzed from the spin-dependent transmission spectrum at different biases.

Effect of H2O Adsorption on Negative Differential Conductance Behavior of Single Junction

“…At the meantime, different strategies are designed to control and improve the functional properties of single molecular device 19 – 22 . In order to gain insights into the controlling mechanism of single molecular functional characteristics 23 – 25 , the effects of external ambient 26 – 28 , electrode distance 29 , 30 , molecule-electrode interface 31 – 35 , molecular anchor 36 – 43 , side group 44 – 47 , doping 48 , 49 and external field 50 – 55 have been studied intensively. In experimental studies, molecular devices are often fabricated in solution and measured in vacuum or in gas circumstance, thus the effect of the surrounding molecule on the functional properties of molecular device should also be discussed 56 – 59 .…”

Gas-sensor property of single-molecule device: F 2 adsorbing effect

“…[10,[21][22][23] In order to understand and improve the underlying functional properties, different strategies are developed to tune the electronic transport properties of molecular devices. [24][25][26][27][28][29][30][31][32] The effects of moleculeelectrode interface, [33][34][35][36] electrode distance, [22,37] molecular anchor, [38][39][40][41][42][43] side group, [13,44] external field, [14][15][16][17][18][19]45] external ambient, [46][47][48][49] doping, [50][51][52][53] and contamination [54] have been studied intensively. Among those, small-molecule adsorbing or doping is an excellent choice by which the performance of molecular device can be modified selectively.…”

Length dependence of rectification in organic co-oligomer spin rectifiers

“…The effects of proportion of the co-oligomer and the interfacial coupling with electrodes were also discussed. [14,15] Upon the design of molecular spin rectifiers, a controllable rectification with a large rectification ratio is another important issue. As one of non-negligible factors, molecular length can be adjusted conveniently in experiments, which has been proved to tune the rectification in normal charge-current molecular diodes by ab-initio and model calculations.…”