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Title: Bipolar charge storage characteristics in copper and cobalt co-doped zinc oxide (ZnO) thin film
Authors: Kumar, A.
Herng, T.S. 
Zeng, K. 
Ding, J. 
Keywords: bipolar charge
charge stability
codoped ZnO
Kelvin probe force microscopy
zinc oxide
Issue Date: 24-Oct-2012
Citation: Kumar, A., Herng, T.S., Zeng, K., Ding, J. (2012-10-24). Bipolar charge storage characteristics in copper and cobalt co-doped zinc oxide (ZnO) thin film. ACS Applied Materials and Interfaces 4 (10) : 5276-5280. ScholarBank@NUS Repository.
Abstract: The bipolar charge phenomenon in Cu and Co co-doped zinc oxide (ZnO) film samples has been studied using scanning probe microscopy (SPM) techniques. Those ZnO samples are made using a pulsed laser deposition (PLD) technique. It is found that the addition of Cu and Co dopants suppresses the electron density in ZnO and causes a significant change in the work function (Fermi level) value of the ZnO film; this results in the ohmic nature of the contact between the electrode (probe tip) and codoped sample, whereas this contact exhibits a Schottky nature in the undoped and single-element-doped samples. These results are verified by Kelvin probe force microscopy (KPFM) and ultraviolet photoelectron spectroscopy (UPS) measurements. It is also found that the co-doping (Cu and Co) can stabilize the bipolar charge, whereas Cu doping only stabilizes the positive charge in ZnO thin films. © 2012 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
ISSN: 19448244
DOI: 10.1021/am301220h
Appears in Collections:Staff Publications

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