Two-Dimensional Ferroelectric Tunnel Junction: The
Case of Monolayer In:SnSe/SnSe/Sb:SnSe Homostructure
Version 2 2019-06-23, 12:04
Version 1 2019-06-23, 12:03
Posted on 2019-06-23 - 12:04
Ferroelectric
tunnel junctions, in which ferroelectric polarization
and quantum tunneling are closely coupled to induce the tunneling
electroresistance (TER) effect, have attracted considerable interest
due to their potential in nonvolatile and low-power consumption memory
devices. The ferroelectric size effect, however, has hindered ferroelectric
tunnel junctions from exhibiting a robust TER effect. Here, our study
proposes doping engineering in a two-dimensional in-plane ferroelectric
semiconductor as an effective strategy to design a two-dimensional
ferroelectric tunnel junction composed of homostructural p-type semiconductor/ferroelectric/n-type
semiconductor. Because the in-plane polarization persists in the monolayer
ferroelectric barrier, the vertical thickness of two-dimensional ferroelectric
tunnel junction can be as thin as a monolayer. We show that the monolayer
In:SnSe/SnSe/Sb:SnSe junction provides an embodiment of this strategy.
Combining density functional theory calculations with nonequilibrium
Green’s function formalism, we investigate the electron transport
properties of In:SnSe/SnSe/Sb:SnSe and reveal a giant TER effect of
1460%. The dynamical modulation of both barrier width and barrier
height during the ferroelectric switching is responsible for this
giant TER effect. These findings provide an important insight into
the understanding of the quantum behaviors of electrons in materials
at the two-dimensional limit and enable new possibilities for next-generation
nonvolatile memory devices based on flexible two-dimensional lateral
ferroelectric tunnel junctions.
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Shen, Xin-Wei; Fang, Yue-Wen; Tian, Bo-Bo; Duan, Chun-Gang (2019). Two-Dimensional Ferroelectric Tunnel Junction: The
Case of Monolayer In:SnSe/SnSe/Sb:SnSe Homostructure. ACS Publications. Collection. https://doi.org/10.1021/acsaelm.9b00146
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AUTHORS (4)
XS
Xin-Wei Shen
YF
Yue-Wen Fang
BT
Bo-Bo Tian
CD
Chun-Gang Duan