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2015 ; 5
(ä): 10548
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Giant Electroresistive Ferroelectric Diode on 2DEG
#MMPMID26014446
Kim SI
; Jin Gwon H
; Kim DH
; Keun Kim S
; Choi JW
; Yoon SJ
; Jung Chang H
; Kang CY
; Kwon B
; Bark CW
; Hong SH
; Kim JS
; Baek SH
Sci Rep
2015[May]; 5
(ä): 10548
PMID26014446
show ga
Manipulation of electrons in a solid through transmitting, storing, and switching
is the fundamental basis for the microelectronic devices. Recently, the
electroresistance effect in the ferroelectric capacitors has provided a novel way
to modulate the electron transport by polarization reversal. Here, we demonstrate
a giant electroresistive ferroelectric diode integrating a ferroelectric
capacitor into two-dimensional electron gas (2DEG) at oxide interface. As a model
system, we fabricate an epitaxial Au/Pb(Zr(0.2)Ti(0.8))O3/LaAlO3/SrTiO3
heterostructure, where 2DEG is formed at LaAlO3/SrTiO3 interface. This device
functions as a two-terminal, non-volatile memory of 1 diode-1 resistor with a
large I+/I- ratio (>10(8) at ± 6 V) and I(on)/I(off) ratio (>10(7)). This is
attributed to not only Schottky barrier modulation at metal/ferroelectric
interface by polarization reversal but also the field-effect metal-insulator
transition of 2DEG. Moreover, using this heterostructure, we can demonstrate a
memristive behavior for an artificial synapse memory, where the resistance can be
continuously tuned by partial polarization switching, and the electrons are only
unidirectionally transmitted. Beyond non-volatile memory and logic devices, our
results will provide new opportunities to emerging electronic devices such as
multifunctional nanoelectronics and neuromorphic electronics.