Graphene-Based Flexible and Transparent Tunable Capacitors
#MMPMID26138450
Man B
; Xu S
; Jiang S
; Liu A
; Gao S
; Zhang C
; Qiu H
; Li Z
Nanoscale Res Lett
2015[Dec]; 10
(1
): 974
PMID26138450
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We report a kind of electric field tunable transparent and flexible capacitor
with the structure of graphene-Bi1.5MgNb1.5O7 (BMN)-graphene. The graphene films
with low sheet resistance were grown by chemical vapor deposition. The BMN thin
films were fabricated on graphene by using laser molecular beam epitaxy
technology. Compared to BMN films grown on Au, the samples on graphene substrates
show better quality in terms of crystallinity, surface morphology, leakage
current, and loss tangent. By transferring another graphene layer, we fabricated
flexible and transparent capacitors with the structure of graphene-BMN-graphene.
The capacitors show a large dielectric constant of 113 with high dielectric
tunability of ~40.7 % at a bias field of 1.0 MV/cm. Also, the capacitor can work
stably in the high bending condition with curvature radii as low as 10 mm. This
flexible film capacitor has a high optical transparency of ~90 % in the visible
light region, demonstrating their potential application for a wide range of
flexible electronic devices.
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