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2017 ; 3
(4
): e1602165
Nephropedia Template TP
Strelcov E
; Dong Q
; Li T
; Chae J
; Shao Y
; Deng Y
; Gruverman A
; Huang J
; Centrone A
Sci Adv
2017[Apr]; 3
(4
): e1602165
PMID28439542
show ga
Ferroelectricity has been proposed as a plausible mechanism to explain the high
photovoltaic conversion efficiency in organic-inorganic perovskites; however,
convincing experimental evidence in support of this hypothesis is still missing.
Identifying and distinguishing ferroelectricity from other properties, such as
piezoelectricity, ferroelasticity, etc., is typically nontrivial because these
phenomena can coexist in many materials. In this work, a combination of
microscopic and nanoscale techniques provides solid evidence for the existence of
ferroelastic domains in both CH(3)NH(3)PbI(3) polycrystalline films and single
crystals in the pristine state and under applied stress. Experiments show that
the configuration of CH(3)NH(3)PbI(3) ferroelastic domains in single crystals and
polycrystalline films can be controlled with applied stress, suggesting that
strain engineering may be used to tune the properties of this material. No
evidence of concomitant ferroelectricity was observed. Because grain boundaries
have an impact on the long-term stability of organic-inorganic perovskite
devices, and because the ferroelastic domain boundaries may differ from regular
grain boundaries, the discovery of ferroelasticity provides a new variable to
consider in the quest for improving their stability and enabling their widespread
adoption.
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