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Stable bipolar surface potential behavior of copper-doped zinc oxide films studied by Kelvin probe force microscopy
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10.1063/1.3521281
/content/aip/journal/apl/97/23/10.1063/1.3521281
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/23/10.1063/1.3521281
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Figures

Image of FIG. 1.
FIG. 1.

(a) Schematics diagrams showing the local negative biasing, followed by KPFM. For positive biasing, the dipoles are of reverse sign. (b) Topography and KPFM images of ZnO:Cu (8 at. %) film after the engagement of a negative or positive biased tips, respectively (scale bar: 500 nm). (c) Dependence of the peak values of the surface potential with the applied biases. (d) Schematic flat band diagram of undoped ZnO and ZnO:Cu under negative/positive biasing.

Image of FIG. 2.
FIG. 2.

(a) Surface potential for the undoped ZnO, ZnO:Cu (2 at. %), ZnO:Cu (8 at. %) films, and their corresponding KPFM images after applying a series of dc biases in the middle of the images, ranging from −8 V (top) to (bottom) the values of the surface potential are obtained based on the line scans shown. (b) Exponential fits to the time evolution of the surface potential on the ZnO:Cu (8 at. %), with and without bottom electrode, under a biased tip of dc voltages of −10 and for 1 min. The corresponding KPFM images immediately and 4 h after biased are shown (scale bars: ).

Image of FIG. 3.
FIG. 3.

(a) Surface potential of the annealed ZnO:Cu (8 at. %) film after applying the same line writing procedure as in Fig. 2(a). (b) Raman spectra of ZnO:Cu (8 at. %) before and after being annealed to in open air for 12 h.

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/content/aip/journal/apl/97/23/10.1063/1.3521281
2010-12-07
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stable bipolar surface potential behavior of copper-doped zinc oxide films studied by Kelvin probe force microscopy
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/23/10.1063/1.3521281
10.1063/1.3521281
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