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Advanced functional materials: visual characterization of piezoelectric properties on the surface of two dimensional material bubbles

wallpapers News 2020-07-29
In recent years two-dimensional piezoelectric materials have attracted more more attention as a model system to study the piezoelectric effect showing a wide range of application prospects. The main reasons are: (1) when the thickness of many non piezoelectric bulk crystals is reduced to the atomic layer thickness symmetry breaking occurs (2) compared with the bulk crystal the two-dimensional material has more excellent mechanical properties which can withst 6%~ (3) the two-dimensional materials have various properties can be assembled into van der Waals heterostructures layer by layer which is expected to bring more novel phenomena applications on the basis of piezoelectric properties. If we can simultaneously characterize the spatial distribution quantitative information of the piezoelectric field on two-dimensional materials it will be helpful to further underst the piezoelectric mechanism in two-dimensional materials realize the design control of piezoelectric devices. However there are still challenges.

in view of this Caoyang team of State Key Laboratory of solid surface physical chemistry of Xiamen University took the bubbles generated by stacking two-dimensional material heterojunction as the model system used Kelvin probe microscope technology to characterize the spatial distribution quantitative information of piezoelectric field on bubbles. Under the light field the separation of photogenerated electrons holes by the medium voltage electric field in the bubble is directly observed. The results of

show that the generation of bubbles will bring strain to the material the piezoelectric field is induced by the strain due to the breaking of structural symmetry of odd layer boron nitride so that the potential gradient can be observed along the radial direction of the bubble; while for the even layer of boron nitride due to the asymmetric direction of the adjacent two layers of lattice the symmetry of the whole structure can be maintained the piezoelectric property can be maintained There is no potential gradient on the whole bubble. In order to prove the universality of this method we also observed a similar piezoelectric potential distribution gradient on the odd layer of MoS2 bubbles with the same piezoelectric properties. At the same time according to the measured piezoelectric potential the piezoelectric coefficients of BN MoS2 are 3.4 ± 1.2 × 10-10 cm-1 3.3 ± 0.2 × 10-10 cm-1 respectively which are consistent with the values reported in the literature also show the accuracy of the quantitative analysis. Based on this bubble model the surface potential of the bubble under illumination was also studied. The separation effect of piezoelectric potential on photo generated carriers was observed in situ. It is expected to be applied in the fields of photoelectric detection photocatalysis.

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