Length dependence of rectification in organic co-oligomer spin rectifiers

Abstract

The rectification ratio of organic magnetic co-oligomer diodes is investigated theoretically by changing the molecular length. The results reveal two distinct length dependences of the rectification ratio: for a short molecular diode, the chargecurrent rectification changes little with the increase of molecular length, while the spin-current rectification is weakened sharply by the length; for a long molecular diode, both the charge-current and spin-current rectification ratios increase quickly with the length. The two kinds of dependence switch at a specific length accompanied with an inversion of the rectifying direction. The molecular ortibals and spin-resolved transmission analysis indicate that the dominant mechanism of rectification suffers a change at this specific length, that is, from asymmetric shift of molecular eigenlevels to asymmetric spatial localization of wave functions upon the reversal of bias. This work demonstrates a feasible way to control the rectification in organic co-oligomer spin diodes by adjusting the molecular length.

Evidence of Critical Tunnelling Width in Ensuring Spin Polarized Asymmetric Negative Differential Resistance Feature in Two‐Dimensional g‐C4N3‐graphene‐g‐C4N3

“…NDR feature had been reported in this case as well but estimated current is relatively low and impact of bias reversal was never discussed. Hu et al [35] . presented a comprehensive study about length dependence of charge current and spin current rectification action in organic co‐oligomer spin rectifier.…”

Theoretical design of single-molecule NOR and XNOR logic gates by using transition metal dibenzotetraaza[14]annulenes*

“…The ability of controlling transport behavior of electron spin provides a significant way to develop highperformance electronic components. [27][28][29][30][31][32][33][34] Naturally, electron spin can also be utilized in designing molecular logic gates. Specifically, input/output signals of a logic gate can be carried by electron spin (i.e., spin-up and spin-down).…”

Controlled charge and spin current rectifications in a spin polarized device

“…Several propositions have been made so far on CC rec-tification, but too limited works are available on SC rectification which thus certainly demands critical analysis to probe into it further. For purposeful designing of a rectifier we need to focus not only on how to achieve higher rectification ratio [1][2][3][4][5][6][7][8][9][12][13][14][15] , but at the same time emphasis should be given on how its magnitude and direction can be controlled selectively [16][17][18][19] . The present work essentially focuses on all these issues.…”